asd

venv/lib/python3.12/site-packages/matplotlib/testing/__init__.py

@@ -0,0 +1,234 @@
+"""
+Helper functions for testing.
+"""
+from pathlib import Path
+from tempfile import TemporaryDirectory
+import locale
+import logging
+import os
+import subprocess
+import sys
+
+import matplotlib as mpl
+from matplotlib import _api
+
+_log = logging.getLogger(__name__)
+
+
+def set_font_settings_for_testing():
+    mpl.rcParams['font.family'] = 'DejaVu Sans'
+    mpl.rcParams['text.hinting'] = 'none'
+    mpl.rcParams['text.hinting_factor'] = 8
+
+
+def set_reproducibility_for_testing():
+    mpl.rcParams['svg.hashsalt'] = 'matplotlib'
+
+
+def setup():
+    # The baseline images are created in this locale, so we should use
+    # it during all of the tests.
+
+    try:
+        locale.setlocale(locale.LC_ALL, 'en_US.UTF-8')
+    except locale.Error:
+        try:
+            locale.setlocale(locale.LC_ALL, 'English_United States.1252')
+        except locale.Error:
+            _log.warning(
+                "Could not set locale to English/United States. "
+                "Some date-related tests may fail.")
+
+    mpl.use('Agg')
+
+    with _api.suppress_matplotlib_deprecation_warning():
+        mpl.rcdefaults()  # Start with all defaults
+
+    # These settings *must* be hardcoded for running the comparison tests and
+    # are not necessarily the default values as specified in rcsetup.py.
+    set_font_settings_for_testing()
+    set_reproducibility_for_testing()
+
+
+def subprocess_run_for_testing(command, env=None, timeout=60, stdout=None,
+                               stderr=None, check=False, text=True,
+                               capture_output=False):
+    """
+    Create and run a subprocess.
+
+    Thin wrapper around `subprocess.run`, intended for testing.  Will
+    mark fork() failures on Cygwin as expected failures: not a
+    success, but not indicating a problem with the code either.
+
+    Parameters
+    ----------
+    args : list of str
+    env : dict[str, str]
+    timeout : float
+    stdout, stderr
+    check : bool
+    text : bool
+        Also called ``universal_newlines`` in subprocess.  I chose this
+        name since the main effect is returning bytes (`False`) vs. str
+        (`True`), though it also tries to normalize newlines across
+        platforms.
+    capture_output : bool
+        Set stdout and stderr to subprocess.PIPE
+
+    Returns
+    -------
+    proc : subprocess.Popen
+
+    See Also
+    --------
+    subprocess.run
+
+    Raises
+    ------
+    pytest.xfail
+        If platform is Cygwin and subprocess reports a fork() failure.
+    """
+    if capture_output:
+        stdout = stderr = subprocess.PIPE
+    try:
+        proc = subprocess.run(
+            command, env=env,
+            timeout=timeout, check=check,
+            stdout=stdout, stderr=stderr,
+            text=text
+        )
+    except BlockingIOError:
+        if sys.platform == "cygwin":
+            # Might want to make this more specific
+            import pytest
+            pytest.xfail("Fork failure")
+        raise
+    return proc
+
+
+def subprocess_run_helper(func, *args, timeout, extra_env=None):
+    """
+    Run a function in a sub-process.
+
+    Parameters
+    ----------
+    func : function
+        The function to be run.  It must be in a module that is importable.
+    *args : str
+        Any additional command line arguments to be passed in
+        the first argument to ``subprocess.run``.
+    extra_env : dict[str, str]
+        Any additional environment variables to be set for the subprocess.
+    """
+    target = func.__name__
+    module = func.__module__
+    file = func.__code__.co_filename
+    proc = subprocess_run_for_testing(
+        [
+            sys.executable,
+            "-c",
+            f"import importlib.util;"
+            f"_spec = importlib.util.spec_from_file_location({module!r}, {file!r});"
+            f"_module = importlib.util.module_from_spec(_spec);"
+            f"_spec.loader.exec_module(_module);"
+            f"_module.{target}()",
+            *args
+        ],
+        env={**os.environ, "SOURCE_DATE_EPOCH": "0", **(extra_env or {})},
+        timeout=timeout, check=True,
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        text=True
+    )
+    return proc
+
+
+def _check_for_pgf(texsystem):
+    """
+    Check if a given TeX system + pgf is available
+
+    Parameters
+    ----------
+    texsystem : str
+        The executable name to check
+    """
+    with TemporaryDirectory() as tmpdir:
+        tex_path = Path(tmpdir, "test.tex")
+        tex_path.write_text(r"""
+            \documentclass{article}
+            \usepackage{pgf}
+            \begin{document}
+            \typeout{pgfversion=\pgfversion}
+            \makeatletter
+            \@@end
+        """, encoding="utf-8")
+        try:
+            subprocess.check_call(
+                [texsystem, "-halt-on-error", str(tex_path)], cwd=tmpdir,
+                stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+        except (OSError, subprocess.CalledProcessError):
+            return False
+        return True
+
+
+def _has_tex_package(package):
+    try:
+        mpl.dviread.find_tex_file(f"{package}.sty")
+        return True
+    except FileNotFoundError:
+        return False
+
+
+def ipython_in_subprocess(requested_backend_or_gui_framework, all_expected_backends):
+    import pytest
+    IPython = pytest.importorskip("IPython")
+
+    if sys.platform == "win32":
+        pytest.skip("Cannot change backend running IPython in subprocess on Windows")
+
+    if (IPython.version_info[:3] == (8, 24, 0) and
+            requested_backend_or_gui_framework == "osx"):
+        pytest.skip("Bug using macosx backend in IPython 8.24.0 fixed in 8.24.1")
+
+    # This code can be removed when Python 3.12, the latest version supported
+    # by IPython < 8.24, reaches end-of-life in late 2028.
+    for min_version, backend in all_expected_backends.items():
+        if IPython.version_info[:2] >= min_version:
+            expected_backend = backend
+            break
+
+    code = ("import matplotlib as mpl, matplotlib.pyplot as plt;"
+            "fig, ax=plt.subplots(); ax.plot([1, 3, 2]); mpl.get_backend()")
+    proc = subprocess_run_for_testing(
+        [
+            "ipython",
+            "--no-simple-prompt",
+            f"--matplotlib={requested_backend_or_gui_framework}",
+            "-c", code,
+        ],
+        check=True,
+        capture_output=True,
+    )
+
+    assert proc.stdout.strip().endswith(f"'{expected_backend}'")
+
+
+def is_ci_environment():
+    # Common CI variables
+    ci_environment_variables = [
+        'CI',        # Generic CI environment variable
+        'CONTINUOUS_INTEGRATION',  # Generic CI environment variable
+        'TRAVIS',    # Travis CI
+        'CIRCLECI',  # CircleCI
+        'JENKINS',   # Jenkins
+        'GITLAB_CI',  # GitLab CI
+        'GITHUB_ACTIONS',  # GitHub Actions
+        'TEAMCITY_VERSION'  # TeamCity
+        # Add other CI environment variables as needed
+    ]
+
+    for env_var in ci_environment_variables:
+        if os.getenv(env_var):
+            return True
+
+    return False

venv/lib/python3.12/site-packages/matplotlib/testing/__init__.pyi

@@ -0,0 +1,54 @@
+from collections.abc import Callable
+import subprocess
+from typing import Any, IO, Literal, overload
+
+def set_font_settings_for_testing() -> None: ...
+def set_reproducibility_for_testing() -> None: ...
+def setup() -> None: ...
+@overload
+def subprocess_run_for_testing(
+    command: list[str],
+    env: dict[str, str] | None = ...,
+    timeout: float | None = ...,
+    stdout: int | IO[Any] | None = ...,
+    stderr: int | IO[Any] | None = ...,
+    check: bool = ...,
+    *,
+    text: Literal[True],
+    capture_output: bool = ...,
+) -> subprocess.CompletedProcess[str]: ...
+@overload
+def subprocess_run_for_testing(
+    command: list[str],
+    env: dict[str, str] | None = ...,
+    timeout: float | None = ...,
+    stdout: int | IO[Any] | None = ...,
+    stderr: int | IO[Any] | None = ...,
+    check: bool = ...,
+    text: Literal[False] = ...,
+    capture_output: bool = ...,
+) -> subprocess.CompletedProcess[bytes]: ...
+@overload
+def subprocess_run_for_testing(
+    command: list[str],
+    env: dict[str, str] | None = ...,
+    timeout: float | None = ...,
+    stdout: int | IO[Any] | None = ...,
+    stderr: int | IO[Any] | None = ...,
+    check: bool = ...,
+    text: bool = ...,
+    capture_output: bool = ...,
+) -> subprocess.CompletedProcess[bytes] | subprocess.CompletedProcess[str]: ...
+def subprocess_run_helper(
+    func: Callable[[], None],
+    *args: Any,
+    timeout: float,
+    extra_env: dict[str, str] | None = ...,
+) -> subprocess.CompletedProcess[str]: ...
+def _check_for_pgf(texsystem: str) -> bool: ...
+def _has_tex_package(package: str) -> bool: ...
+def ipython_in_subprocess(
+    requested_backend_or_gui_framework: str,
+    all_expected_backends: dict[tuple[int, int], str],
+) -> None: ...
+def is_ci_environment() -> bool: ...

venv/lib/python3.12/site-packages/matplotlib/testing/_markers.py

@@ -0,0 +1,49 @@
+"""
+pytest markers for the internal Matplotlib test suite.
+"""
+
+import logging
+import shutil
+
+import pytest
+
+import matplotlib.testing
+import matplotlib.testing.compare
+from matplotlib import _get_executable_info, ExecutableNotFoundError
+
+
+_log = logging.getLogger(__name__)
+
+
+def _checkdep_usetex() -> bool:
+    if not shutil.which("tex"):
+        _log.warning("usetex mode requires TeX.")
+        return False
+    try:
+        _get_executable_info("dvipng")
+    except ExecutableNotFoundError:
+        _log.warning("usetex mode requires dvipng.")
+        return False
+    try:
+        _get_executable_info("gs")
+    except ExecutableNotFoundError:
+        _log.warning("usetex mode requires ghostscript.")
+        return False
+    return True
+
+
+needs_ghostscript = pytest.mark.skipif(
+    "eps" not in matplotlib.testing.compare.converter,
+    reason="This test needs a ghostscript installation")
+needs_pgf_lualatex = pytest.mark.skipif(
+    not matplotlib.testing._check_for_pgf('lualatex'),
+    reason='lualatex + pgf is required')
+needs_pgf_pdflatex = pytest.mark.skipif(
+    not matplotlib.testing._check_for_pgf('pdflatex'),
+    reason='pdflatex + pgf is required')
+needs_pgf_xelatex = pytest.mark.skipif(
+    not matplotlib.testing._check_for_pgf('xelatex'),
+    reason='xelatex + pgf is required')
+needs_usetex = pytest.mark.skipif(
+    not _checkdep_usetex(),
+    reason="This test needs a TeX installation")

venv/lib/python3.12/site-packages/matplotlib/testing/compare.py

@@ -0,0 +1,520 @@
+"""
+Utilities for comparing image results.
+"""
+
+import atexit
+import functools
+import hashlib
+import logging
+import os
+from pathlib import Path
+import shutil
+import subprocess
+import sys
+from tempfile import TemporaryDirectory, TemporaryFile
+import weakref
+
+import numpy as np
+from PIL import Image
+
+import matplotlib as mpl
+from matplotlib import cbook
+from matplotlib.testing.exceptions import ImageComparisonFailure
+
+_log = logging.getLogger(__name__)
+
+__all__ = ['calculate_rms', 'comparable_formats', 'compare_images']
+
+
+def make_test_filename(fname, purpose):
+    """
+    Make a new filename by inserting *purpose* before the file's extension.
+    """
+    base, ext = os.path.splitext(fname)
+    return f'{base}-{purpose}{ext}'
+
+
+def _get_cache_path():
+    cache_dir = Path(mpl.get_cachedir(), 'test_cache')
+    cache_dir.mkdir(parents=True, exist_ok=True)
+    return cache_dir
+
+
+def get_cache_dir():
+    return str(_get_cache_path())
+
+
+def get_file_hash(path, block_size=2 ** 20):
+    md5 = hashlib.md5()
+    with open(path, 'rb') as fd:
+        while True:
+            data = fd.read(block_size)
+            if not data:
+                break
+            md5.update(data)
+
+    if Path(path).suffix == '.pdf':
+        md5.update(str(mpl._get_executable_info("gs").version)
+                   .encode('utf-8'))
+    elif Path(path).suffix == '.svg':
+        md5.update(str(mpl._get_executable_info("inkscape").version)
+                   .encode('utf-8'))
+
+    return md5.hexdigest()
+
+
+class _ConverterError(Exception):
+    pass
+
+
+class _Converter:
+    def __init__(self):
+        self._proc = None
+        # Explicitly register deletion from an atexit handler because if we
+        # wait until the object is GC'd (which occurs later), then some module
+        # globals (e.g. signal.SIGKILL) has already been set to None, and
+        # kill() doesn't work anymore...
+        atexit.register(self.__del__)
+
+    def __del__(self):
+        if self._proc:
+            self._proc.kill()
+            self._proc.wait()
+            for stream in filter(None, [self._proc.stdin,
+                                        self._proc.stdout,
+                                        self._proc.stderr]):
+                stream.close()
+            self._proc = None
+
+    def _read_until(self, terminator):
+        """Read until the prompt is reached."""
+        buf = bytearray()
+        while True:
+            c = self._proc.stdout.read(1)
+            if not c:
+                raise _ConverterError(os.fsdecode(bytes(buf)))
+            buf.extend(c)
+            if buf.endswith(terminator):
+                return bytes(buf)
+
+
+class _GSConverter(_Converter):
+    def __call__(self, orig, dest):
+        if not self._proc:
+            self._proc = subprocess.Popen(
+                [mpl._get_executable_info("gs").executable,
+                 "-dNOSAFER", "-dNOPAUSE", "-dEPSCrop", "-sDEVICE=png16m"],
+                # As far as I can see, ghostscript never outputs to stderr.
+                stdin=subprocess.PIPE, stdout=subprocess.PIPE)
+            try:
+                self._read_until(b"\nGS")
+            except _ConverterError as e:
+                raise OSError(f"Failed to start Ghostscript:\n\n{e.args[0]}") from None
+
+        def encode_and_escape(name):
+            return (os.fsencode(name)
+                    .replace(b"\\", b"\\\\")
+                    .replace(b"(", br"\(")
+                    .replace(b")", br"\)"))
+
+        self._proc.stdin.write(
+            b"<< /OutputFile ("
+            + encode_and_escape(dest)
+            + b") >> setpagedevice ("
+            + encode_and_escape(orig)
+            + b") run flush\n")
+        self._proc.stdin.flush()
+        # GS> if nothing left on the stack; GS<n> if n items left on the stack.
+        err = self._read_until((b"GS<", b"GS>"))
+        stack = self._read_until(b">") if err.endswith(b"GS<") else b""
+        if stack or not os.path.exists(dest):
+            stack_size = int(stack[:-1]) if stack else 0
+            self._proc.stdin.write(b"pop\n" * stack_size)
+            # Using the systemencoding should at least get the filenames right.
+            raise ImageComparisonFailure(
+                (err + stack).decode(sys.getfilesystemencoding(), "replace"))
+
+
+class _SVGConverter(_Converter):
+    def __call__(self, orig, dest):
+        old_inkscape = mpl._get_executable_info("inkscape").version.major < 1
+        terminator = b"\n>" if old_inkscape else b"> "
+        if not hasattr(self, "_tmpdir"):
+            self._tmpdir = TemporaryDirectory()
+            # On Windows, we must make sure that self._proc has terminated
+            # (which __del__ does) before clearing _tmpdir.
+            weakref.finalize(self._tmpdir, self.__del__)
+        if (not self._proc  # First run.
+                or self._proc.poll() is not None):  # Inkscape terminated.
+            if self._proc is not None and self._proc.poll() is not None:
+                for stream in filter(None, [self._proc.stdin,
+                                            self._proc.stdout,
+                                            self._proc.stderr]):
+                    stream.close()
+            env = {
+                **os.environ,
+                # If one passes e.g. a png file to Inkscape, it will try to
+                # query the user for conversion options via a GUI (even with
+                # `--without-gui`).  Unsetting `DISPLAY` prevents this (and
+                # causes GTK to crash and Inkscape to terminate, but that'll
+                # just be reported as a regular exception below).
+                "DISPLAY": "",
+                # Do not load any user options.
+                "INKSCAPE_PROFILE_DIR": self._tmpdir.name,
+            }
+            # Old versions of Inkscape (e.g. 0.48.3.1) seem to sometimes
+            # deadlock when stderr is redirected to a pipe, so we redirect it
+            # to a temporary file instead.  This is not necessary anymore as of
+            # Inkscape 0.92.1.
+            stderr = TemporaryFile()
+            self._proc = subprocess.Popen(
+                ["inkscape", "--without-gui", "--shell"] if old_inkscape else
+                ["inkscape", "--shell"],
+                stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=stderr,
+                env=env, cwd=self._tmpdir.name)
+            # Slight abuse, but makes shutdown handling easier.
+            self._proc.stderr = stderr
+            try:
+                self._read_until(terminator)
+            except _ConverterError as err:
+                raise OSError(
+                    "Failed to start Inkscape in interactive mode:\n\n"
+                    + err.args[0]) from err
+
+        # Inkscape's shell mode does not support escaping metacharacters in the
+        # filename ("\n", and ":;" for inkscape>=1).  Avoid any problems by
+        # running from a temporary directory and using fixed filenames.
+        inkscape_orig = Path(self._tmpdir.name, os.fsdecode(b"f.svg"))
+        inkscape_dest = Path(self._tmpdir.name, os.fsdecode(b"f.png"))
+        try:
+            inkscape_orig.symlink_to(Path(orig).resolve())
+        except OSError:
+            shutil.copyfile(orig, inkscape_orig)
+        self._proc.stdin.write(
+            b"f.svg --export-png=f.png\n" if old_inkscape else
+            b"file-open:f.svg;export-filename:f.png;export-do;file-close\n")
+        self._proc.stdin.flush()
+        try:
+            self._read_until(terminator)
+        except _ConverterError as err:
+            # Inkscape's output is not localized but gtk's is, so the output
+            # stream probably has a mixed encoding.  Using the filesystem
+            # encoding should at least get the filenames right...
+            self._proc.stderr.seek(0)
+            raise ImageComparisonFailure(
+                self._proc.stderr.read().decode(
+                    sys.getfilesystemencoding(), "replace")) from err
+        os.remove(inkscape_orig)
+        shutil.move(inkscape_dest, dest)
+
+    def __del__(self):
+        super().__del__()
+        if hasattr(self, "_tmpdir"):
+            self._tmpdir.cleanup()
+
+
+class _SVGWithMatplotlibFontsConverter(_SVGConverter):
+    """
+    A SVG converter which explicitly adds the fonts shipped by Matplotlib to
+    Inkspace's font search path, to better support `svg.fonttype = "none"`
+    (which is in particular used by certain mathtext tests).
+    """
+
+    def __call__(self, orig, dest):
+        if not hasattr(self, "_tmpdir"):
+            self._tmpdir = TemporaryDirectory()
+            shutil.copytree(cbook._get_data_path("fonts/ttf"),
+                            Path(self._tmpdir.name, "fonts"))
+        return super().__call__(orig, dest)
+
+
+def _update_converter():
+    try:
+        mpl._get_executable_info("gs")
+    except mpl.ExecutableNotFoundError:
+        pass
+    else:
+        converter['pdf'] = converter['eps'] = _GSConverter()
+    try:
+        mpl._get_executable_info("inkscape")
+    except mpl.ExecutableNotFoundError:
+        pass
+    else:
+        converter['svg'] = _SVGConverter()
+
+
+#: A dictionary that maps filename extensions to functions which themselves
+#: convert between arguments `old` and `new` (filenames).
+converter = {}
+_update_converter()
+_svg_with_matplotlib_fonts_converter = _SVGWithMatplotlibFontsConverter()
+
+
+def comparable_formats():
+    """
+    Return the list of file formats that `.compare_images` can compare
+    on this system.
+
+    Returns
+    -------
+    list of str
+        E.g. ``['png', 'pdf', 'svg', 'eps']``.
+
+    """
+    return ['png', *converter]
+
+
+def convert(filename, cache):
+    """
+    Convert the named file to png; return the name of the created file.
+
+    If *cache* is True, the result of the conversion is cached in
+    `matplotlib.get_cachedir() + '/test_cache/'`.  The caching is based on a
+    hash of the exact contents of the input file.  Old cache entries are
+    automatically deleted as needed to keep the size of the cache capped to
+    twice the size of all baseline images.
+    """
+    path = Path(filename)
+    if not path.exists():
+        raise OSError(f"{path} does not exist")
+    if path.suffix[1:] not in converter:
+        import pytest
+        pytest.skip(f"Don't know how to convert {path.suffix} files to png")
+    newpath = path.parent / f"{path.stem}_{path.suffix[1:]}.png"
+
+    # Only convert the file if the destination doesn't already exist or
+    # is out of date.
+    if not newpath.exists() or newpath.stat().st_mtime < path.stat().st_mtime:
+        cache_dir = _get_cache_path() if cache else None
+
+        if cache_dir is not None:
+            _register_conversion_cache_cleaner_once()
+            hash_value = get_file_hash(path)
+            cached_path = cache_dir / (hash_value + newpath.suffix)
+            if cached_path.exists():
+                _log.debug("For %s: reusing cached conversion.", filename)
+                shutil.copyfile(cached_path, newpath)
+                return str(newpath)
+
+        _log.debug("For %s: converting to png.", filename)
+        convert = converter[path.suffix[1:]]
+        if path.suffix == ".svg":
+            contents = path.read_text()
+            # NOTE: This check should be kept in sync with font styling in
+            # `lib/matplotlib/backends/backend_svg.py`. If it changes, then be sure to
+            # re-generate any SVG test files using this mode, or else such tests will
+            # fail to use the converter for the expected images (but will for the
+            # results), and the tests will fail strangely.
+            if 'style="font:' in contents:
+                # for svg.fonttype = none, we explicitly patch the font search
+                # path so that fonts shipped by Matplotlib are found.
+                convert = _svg_with_matplotlib_fonts_converter
+        convert(path, newpath)
+
+        if cache_dir is not None:
+            _log.debug("For %s: caching conversion result.", filename)
+            shutil.copyfile(newpath, cached_path)
+
+    return str(newpath)
+
+
+def _clean_conversion_cache():
+    # This will actually ignore mpl_toolkits baseline images, but they're
+    # relatively small.
+    baseline_images_size = sum(
+        path.stat().st_size
+        for path in Path(mpl.__file__).parent.glob("**/baseline_images/**/*"))
+    # 2x: one full copy of baselines, and one full copy of test results
+    # (actually an overestimate: we don't convert png baselines and results).
+    max_cache_size = 2 * baseline_images_size
+    # Reduce cache until it fits.
+    with cbook._lock_path(_get_cache_path()):
+        cache_stat = {
+            path: path.stat() for path in _get_cache_path().glob("*")}
+        cache_size = sum(stat.st_size for stat in cache_stat.values())
+        paths_by_atime = sorted(  # Oldest at the end.
+            cache_stat, key=lambda path: cache_stat[path].st_atime,
+            reverse=True)
+        while cache_size > max_cache_size:
+            path = paths_by_atime.pop()
+            cache_size -= cache_stat[path].st_size
+            path.unlink()
+
+
+@functools.cache  # Ensure this is only registered once.
+def _register_conversion_cache_cleaner_once():
+    atexit.register(_clean_conversion_cache)
+
+
+def crop_to_same(actual_path, actual_image, expected_path, expected_image):
+    # clip the images to the same size -- this is useful only when
+    # comparing eps to pdf
+    if actual_path[-7:-4] == 'eps' and expected_path[-7:-4] == 'pdf':
+        aw, ah, ad = actual_image.shape
+        ew, eh, ed = expected_image.shape
+        actual_image = actual_image[int(aw / 2 - ew / 2):int(
+            aw / 2 + ew / 2), int(ah / 2 - eh / 2):int(ah / 2 + eh / 2)]
+    return actual_image, expected_image
+
+
+def calculate_rms(expected_image, actual_image):
+    """
+    Calculate the per-pixel errors, then compute the root mean square error.
+    """
+    if expected_image.shape != actual_image.shape:
+        raise ImageComparisonFailure(
+            f"Image sizes do not match expected size: {expected_image.shape} "
+            f"actual size {actual_image.shape}")
+    # Convert to float to avoid overflowing finite integer types.
+    return np.sqrt(((expected_image - actual_image).astype(float) ** 2).mean())
+
+
+# NOTE: compare_image and save_diff_image assume that the image does not have
+# 16-bit depth, as Pillow converts these to RGB incorrectly.
+
+
+def _load_image(path):
+    img = Image.open(path)
+    # In an RGBA image, if the smallest value in the alpha channel is 255, all
+    # values in it must be 255, meaning that the image is opaque. If so,
+    # discard the alpha channel so that it may compare equal to an RGB image.
+    if img.mode != "RGBA" or img.getextrema()[3][0] == 255:
+        img = img.convert("RGB")
+    return np.asarray(img)
+
+
+def compare_images(expected, actual, tol, in_decorator=False):
+    """
+    Compare two "image" files checking differences within a tolerance.
+
+    The two given filenames may point to files which are convertible to
+    PNG via the `.converter` dictionary. The underlying RMS is calculated
+    with the `.calculate_rms` function.
+
+    Parameters
+    ----------
+    expected : str
+        The filename of the expected image.
+    actual : str
+        The filename of the actual image.
+    tol : float
+        The tolerance (a color value difference, where 255 is the
+        maximal difference).  The test fails if the average pixel
+        difference is greater than this value.
+    in_decorator : bool
+        Determines the output format. If called from image_comparison
+        decorator, this should be True. (default=False)
+
+    Returns
+    -------
+    None or dict or str
+        Return *None* if the images are equal within the given tolerance.
+
+        If the images differ, the return value depends on  *in_decorator*.
+        If *in_decorator* is true, a dict with the following entries is
+        returned:
+
+        - *rms*: The RMS of the image difference.
+        - *expected*: The filename of the expected image.
+        - *actual*: The filename of the actual image.
+        - *diff_image*: The filename of the difference image.
+        - *tol*: The comparison tolerance.
+
+        Otherwise, a human-readable multi-line string representation of this
+        information is returned.
+
+    Examples
+    --------
+    ::
+
+        img1 = "./baseline/plot.png"
+        img2 = "./output/plot.png"
+        compare_images(img1, img2, 0.001)
+
+    """
+    actual = os.fspath(actual)
+    if not os.path.exists(actual):
+        raise Exception(f"Output image {actual} does not exist.")
+    if os.stat(actual).st_size == 0:
+        raise Exception(f"Output image file {actual} is empty.")
+
+    # Convert the image to png
+    expected = os.fspath(expected)
+    if not os.path.exists(expected):
+        raise OSError(f'Baseline image {expected!r} does not exist.')
+    extension = expected.split('.')[-1]
+    if extension != 'png':
+        actual = convert(actual, cache=True)
+        expected = convert(expected, cache=True)
+
+    # open the image files
+    expected_image = _load_image(expected)
+    actual_image = _load_image(actual)
+
+    actual_image, expected_image = crop_to_same(
+        actual, actual_image, expected, expected_image)
+
+    diff_image = make_test_filename(actual, 'failed-diff')
+
+    if tol <= 0:
+        if np.array_equal(expected_image, actual_image):
+            return None
+
+    # convert to signed integers, so that the images can be subtracted without
+    # overflow
+    expected_image = expected_image.astype(np.int16)
+    actual_image = actual_image.astype(np.int16)
+
+    rms = calculate_rms(expected_image, actual_image)
+
+    if rms <= tol:
+        return None
+
+    save_diff_image(expected, actual, diff_image)
+
+    results = dict(rms=rms, expected=str(expected),
+                   actual=str(actual), diff=str(diff_image), tol=tol)
+
+    if not in_decorator:
+        # Then the results should be a string suitable for stdout.
+        template = ['Error: Image files did not match.',
+                    'RMS Value: {rms}',
+                    'Expected:  \n    {expected}',
+                    'Actual:    \n    {actual}',
+                    'Difference:\n    {diff}',
+                    'Tolerance: \n    {tol}', ]
+        results = '\n  '.join([line.format(**results) for line in template])
+    return results
+
+
+def save_diff_image(expected, actual, output):
+    """
+    Parameters
+    ----------
+    expected : str
+        File path of expected image.
+    actual : str
+        File path of actual image.
+    output : str
+        File path to save difference image to.
+    """
+    expected_image = _load_image(expected)
+    actual_image = _load_image(actual)
+    actual_image, expected_image = crop_to_same(
+        actual, actual_image, expected, expected_image)
+    expected_image = np.array(expected_image, float)
+    actual_image = np.array(actual_image, float)
+    if expected_image.shape != actual_image.shape:
+        raise ImageComparisonFailure(
+            f"Image sizes do not match expected size: {expected_image.shape} "
+            f"actual size {actual_image.shape}")
+    abs_diff = np.abs(expected_image - actual_image)
+
+    # expand differences in luminance domain
+    abs_diff *= 10
+    abs_diff = np.clip(abs_diff, 0, 255).astype(np.uint8)
+
+    if abs_diff.shape[2] == 4:  # Hard-code the alpha channel to fully solid
+        abs_diff[:, :, 3] = 255
+
+    Image.fromarray(abs_diff).save(output, format="png")

venv/lib/python3.12/site-packages/matplotlib/testing/compare.pyi

@@ -0,0 +1,32 @@
+from collections.abc import Callable
+from typing import Literal, overload
+
+from numpy.typing import NDArray
+
+__all__ = ["calculate_rms", "comparable_formats", "compare_images"]
+
+def make_test_filename(fname: str, purpose: str) -> str: ...
+def get_cache_dir() -> str: ...
+def get_file_hash(path: str, block_size: int = ...) -> str: ...
+
+converter: dict[str, Callable[[str, str], None]] = {}
+
+def comparable_formats() -> list[str]: ...
+def convert(filename: str, cache: bool) -> str: ...
+def crop_to_same(
+    actual_path: str, actual_image: NDArray, expected_path: str, expected_image: NDArray
+) -> tuple[NDArray, NDArray]: ...
+def calculate_rms(expected_image: NDArray, actual_image: NDArray) -> float: ...
+@overload
+def compare_images(
+    expected: str, actual: str, tol: float, in_decorator: Literal[True]
+) -> None | dict[str, float | str]: ...
+@overload
+def compare_images(
+    expected: str, actual: str, tol: float, in_decorator: Literal[False]
+) -> None | str: ...
+@overload
+def compare_images(
+    expected: str, actual: str, tol: float, in_decorator: bool = ...
+) -> None | str | dict[str, float | str]: ...
+def save_diff_image(expected: str, actual: str, output: str) -> None: ...

venv/lib/python3.12/site-packages/matplotlib/testing/conftest.py

@@ -0,0 +1,100 @@
+import pytest
+import sys
+import matplotlib
+from matplotlib import _api
+
+
+def pytest_configure(config):
+    # config is initialized here rather than in pytest.ini so that `pytest
+    # --pyargs matplotlib` (which would not find pytest.ini) works.  The only
+    # entries in pytest.ini set minversion (which is checked earlier),
+    # testpaths/python_files, as they are required to properly find the tests
+    for key, value in [
+        ("markers", "flaky: (Provided by pytest-rerunfailures.)"),
+        ("markers", "timeout: (Provided by pytest-timeout.)"),
+        ("markers", "backend: Set alternate Matplotlib backend temporarily."),
+        ("markers", "baseline_images: Compare output against references."),
+        ("markers", "pytz: Tests that require pytz to be installed."),
+        ("filterwarnings", "error"),
+        ("filterwarnings",
+         "ignore:.*The py23 module has been deprecated:DeprecationWarning"),
+        ("filterwarnings",
+         r"ignore:DynamicImporter.find_spec\(\) not found; "
+         r"falling back to find_module\(\):ImportWarning"),
+    ]:
+        config.addinivalue_line(key, value)
+
+    matplotlib.use('agg', force=True)
+    matplotlib._called_from_pytest = True
+    matplotlib._init_tests()
+
+
+def pytest_unconfigure(config):
+    matplotlib._called_from_pytest = False
+
+
+@pytest.fixture(autouse=True)
+def mpl_test_settings(request):
+    from matplotlib.testing.decorators import _cleanup_cm
+
+    with _cleanup_cm():
+
+        backend = None
+        backend_marker = request.node.get_closest_marker('backend')
+        prev_backend = matplotlib.get_backend()
+        if backend_marker is not None:
+            assert len(backend_marker.args) == 1, \
+                "Marker 'backend' must specify 1 backend."
+            backend, = backend_marker.args
+            skip_on_importerror = backend_marker.kwargs.get(
+                'skip_on_importerror', False)
+
+            # special case Qt backend importing to avoid conflicts
+            if backend.lower().startswith('qt5'):
+                if any(sys.modules.get(k) for k in ('PyQt4', 'PySide')):
+                    pytest.skip('Qt4 binding already imported')
+
+        matplotlib.testing.setup()
+        with _api.suppress_matplotlib_deprecation_warning():
+            if backend is not None:
+                # This import must come after setup() so it doesn't load the
+                # default backend prematurely.
+                import matplotlib.pyplot as plt
+                try:
+                    plt.switch_backend(backend)
+                except ImportError as exc:
+                    # Should only occur for the cairo backend tests, if neither
+                    # pycairo nor cairocffi are installed.
+                    if 'cairo' in backend.lower() or skip_on_importerror:
+                        pytest.skip("Failed to switch to backend "
+                                    f"{backend} ({exc}).")
+                    else:
+                        raise
+            # Default of cleanup and image_comparison too.
+            matplotlib.style.use(["classic", "_classic_test_patch"])
+        try:
+            yield
+        finally:
+            if backend is not None:
+                plt.close("all")
+                matplotlib.use(prev_backend)
+
+
+@pytest.fixture
+def pd():
+    """Fixture to import and configure pandas."""
+    pd = pytest.importorskip('pandas')
+    try:
+        from pandas.plotting import (
+            deregister_matplotlib_converters as deregister)
+        deregister()
+    except ImportError:
+        pass
+    return pd
+
+
+@pytest.fixture
+def xr():
+    """Fixture to import xarray."""
+    xr = pytest.importorskip('xarray')
+    return xr

venv/lib/python3.12/site-packages/matplotlib/testing/conftest.pyi

@@ -0,0 +1,12 @@
+from types import ModuleType
+
+import pytest
+
+def pytest_configure(config: pytest.Config) -> None: ...
+def pytest_unconfigure(config: pytest.Config) -> None: ...
+@pytest.fixture
+def mpl_test_settings(request: pytest.FixtureRequest) -> None: ...
+@pytest.fixture
+def pd() -> ModuleType: ...
+@pytest.fixture
+def xr() -> ModuleType: ...

venv/lib/python3.12/site-packages/matplotlib/testing/decorators.py

@@ -0,0 +1,464 @@
+import contextlib
+import functools
+import inspect
+import os
+from platform import uname
+from pathlib import Path
+import shutil
+import string
+import sys
+import warnings
+
+from packaging.version import parse as parse_version
+
+import matplotlib.style
+import matplotlib.units
+import matplotlib.testing
+from matplotlib import _pylab_helpers, cbook, ft2font, pyplot as plt, ticker
+from .compare import comparable_formats, compare_images, make_test_filename
+from .exceptions import ImageComparisonFailure
+
+
+@contextlib.contextmanager
+def _cleanup_cm():
+    orig_units_registry = matplotlib.units.registry.copy()
+    try:
+        with warnings.catch_warnings(), matplotlib.rc_context():
+            yield
+    finally:
+        matplotlib.units.registry.clear()
+        matplotlib.units.registry.update(orig_units_registry)
+        plt.close("all")
+
+
+def _check_freetype_version(ver):
+    if ver is None:
+        return True
+
+    if isinstance(ver, str):
+        ver = (ver, ver)
+    ver = [parse_version(x) for x in ver]
+    found = parse_version(ft2font.__freetype_version__)
+
+    return ver[0] <= found <= ver[1]
+
+
+def _checked_on_freetype_version(required_freetype_version):
+    import pytest
+    return pytest.mark.xfail(
+        not _check_freetype_version(required_freetype_version),
+        reason=f"Mismatched version of freetype. "
+               f"Test requires '{required_freetype_version}', "
+               f"you have '{ft2font.__freetype_version__}'",
+        raises=ImageComparisonFailure, strict=False)
+
+
+def remove_ticks_and_titles(figure):
+    figure.suptitle("")
+    null_formatter = ticker.NullFormatter()
+    def remove_ticks(ax):
+        """Remove ticks in *ax* and all its child Axes."""
+        ax.set_title("")
+        ax.xaxis.set_major_formatter(null_formatter)
+        ax.xaxis.set_minor_formatter(null_formatter)
+        ax.yaxis.set_major_formatter(null_formatter)
+        ax.yaxis.set_minor_formatter(null_formatter)
+        try:
+            ax.zaxis.set_major_formatter(null_formatter)
+            ax.zaxis.set_minor_formatter(null_formatter)
+        except AttributeError:
+            pass
+        for child in ax.child_axes:
+            remove_ticks(child)
+    for ax in figure.get_axes():
+        remove_ticks(ax)
+
+
+@contextlib.contextmanager
+def _collect_new_figures():
+    """
+    After::
+
+        with _collect_new_figures() as figs:
+            some_code()
+
+    the list *figs* contains the figures that have been created during the
+    execution of ``some_code``, sorted by figure number.
+    """
+    managers = _pylab_helpers.Gcf.figs
+    preexisting = [manager for manager in managers.values()]
+    new_figs = []
+    try:
+        yield new_figs
+    finally:
+        new_managers = sorted([manager for manager in managers.values()
+                               if manager not in preexisting],
+                              key=lambda manager: manager.num)
+        new_figs[:] = [manager.canvas.figure for manager in new_managers]
+
+
+def _raise_on_image_difference(expected, actual, tol):
+    __tracebackhide__ = True
+
+    err = compare_images(expected, actual, tol, in_decorator=True)
+    if err:
+        for key in ["actual", "expected", "diff"]:
+            err[key] = os.path.relpath(err[key])
+        raise ImageComparisonFailure(
+            ('images not close (RMS %(rms).3f):'
+                '\n\t%(actual)s\n\t%(expected)s\n\t%(diff)s') % err)
+
+
+class _ImageComparisonBase:
+    """
+    Image comparison base class
+
+    This class provides *just* the comparison-related functionality and avoids
+    any code that would be specific to any testing framework.
+    """
+
+    def __init__(self, func, tol, remove_text, savefig_kwargs):
+        self.func = func
+        self.baseline_dir, self.result_dir = _image_directories(func)
+        self.tol = tol
+        self.remove_text = remove_text
+        self.savefig_kwargs = savefig_kwargs
+
+    def copy_baseline(self, baseline, extension):
+        baseline_path = self.baseline_dir / baseline
+        orig_expected_path = baseline_path.with_suffix(f'.{extension}')
+        if extension == 'eps' and not orig_expected_path.exists():
+            orig_expected_path = orig_expected_path.with_suffix('.pdf')
+        expected_fname = make_test_filename(
+            self.result_dir / orig_expected_path.name, 'expected')
+        try:
+            # os.symlink errors if the target already exists.
+            with contextlib.suppress(OSError):
+                os.remove(expected_fname)
+            try:
+                if 'microsoft' in uname().release.lower():
+                    raise OSError  # On WSL, symlink breaks silently
+                os.symlink(orig_expected_path, expected_fname)
+            except OSError:  # On Windows, symlink *may* be unavailable.
+                shutil.copyfile(orig_expected_path, expected_fname)
+        except OSError as err:
+            raise ImageComparisonFailure(
+                f"Missing baseline image {expected_fname} because the "
+                f"following file cannot be accessed: "
+                f"{orig_expected_path}") from err
+        return expected_fname
+
+    def compare(self, fig, baseline, extension, *, _lock=False):
+        __tracebackhide__ = True
+
+        if self.remove_text:
+            remove_ticks_and_titles(fig)
+
+        actual_path = (self.result_dir / baseline).with_suffix(f'.{extension}')
+        kwargs = self.savefig_kwargs.copy()
+        if extension == 'pdf':
+            kwargs.setdefault('metadata',
+                              {'Creator': None, 'Producer': None,
+                               'CreationDate': None})
+
+        lock = (cbook._lock_path(actual_path)
+                if _lock else contextlib.nullcontext())
+        with lock:
+            try:
+                fig.savefig(actual_path, **kwargs)
+            finally:
+                # Matplotlib has an autouse fixture to close figures, but this
+                # makes things more convenient for third-party users.
+                plt.close(fig)
+            expected_path = self.copy_baseline(baseline, extension)
+            _raise_on_image_difference(expected_path, actual_path, self.tol)
+
+
+def _pytest_image_comparison(baseline_images, extensions, tol,
+                             freetype_version, remove_text, savefig_kwargs,
+                             style):
+    """
+    Decorate function with image comparison for pytest.
+
+    This function creates a decorator that wraps a figure-generating function
+    with image comparison code.
+    """
+    import pytest
+
+    KEYWORD_ONLY = inspect.Parameter.KEYWORD_ONLY
+
+    def decorator(func):
+        old_sig = inspect.signature(func)
+
+        @functools.wraps(func)
+        @pytest.mark.parametrize('extension', extensions)
+        @matplotlib.style.context(style)
+        @_checked_on_freetype_version(freetype_version)
+        @functools.wraps(func)
+        def wrapper(*args, extension, request, **kwargs):
+            __tracebackhide__ = True
+            if 'extension' in old_sig.parameters:
+                kwargs['extension'] = extension
+            if 'request' in old_sig.parameters:
+                kwargs['request'] = request
+
+            if extension not in comparable_formats():
+                reason = {
+                    'pdf': 'because Ghostscript is not installed',
+                    'eps': 'because Ghostscript is not installed',
+                    'svg': 'because Inkscape is not installed',
+                }.get(extension, 'on this system')
+                pytest.skip(f"Cannot compare {extension} files {reason}")
+
+            img = _ImageComparisonBase(func, tol=tol, remove_text=remove_text,
+                                       savefig_kwargs=savefig_kwargs)
+            matplotlib.testing.set_font_settings_for_testing()
+
+            with _collect_new_figures() as figs:
+                func(*args, **kwargs)
+
+            # If the test is parametrized in any way other than applied via
+            # this decorator, then we need to use a lock to prevent two
+            # processes from touching the same output file.
+            needs_lock = any(
+                marker.args[0] != 'extension'
+                for marker in request.node.iter_markers('parametrize'))
+
+            if baseline_images is not None:
+                our_baseline_images = baseline_images
+            else:
+                # Allow baseline image list to be produced on the fly based on
+                # current parametrization.
+                our_baseline_images = request.getfixturevalue(
+                    'baseline_images')
+
+            assert len(figs) == len(our_baseline_images), (
+                f"Test generated {len(figs)} images but there are "
+                f"{len(our_baseline_images)} baseline images")
+            for fig, baseline in zip(figs, our_baseline_images):
+                img.compare(fig, baseline, extension, _lock=needs_lock)
+
+        parameters = list(old_sig.parameters.values())
+        if 'extension' not in old_sig.parameters:
+            parameters += [inspect.Parameter('extension', KEYWORD_ONLY)]
+        if 'request' not in old_sig.parameters:
+            parameters += [inspect.Parameter("request", KEYWORD_ONLY)]
+        new_sig = old_sig.replace(parameters=parameters)
+        wrapper.__signature__ = new_sig
+
+        # Reach a bit into pytest internals to hoist the marks from our wrapped
+        # function.
+        new_marks = getattr(func, 'pytestmark', []) + wrapper.pytestmark
+        wrapper.pytestmark = new_marks
+
+        return wrapper
+
+    return decorator
+
+
+def image_comparison(baseline_images, extensions=None, tol=0,
+                     freetype_version=None, remove_text=False,
+                     savefig_kwarg=None,
+                     # Default of mpl_test_settings fixture and cleanup too.
+                     style=("classic", "_classic_test_patch")):
+    """
+    Compare images generated by the test with those specified in
+    *baseline_images*, which must correspond, else an `ImageComparisonFailure`
+    exception will be raised.
+
+    Parameters
+    ----------
+    baseline_images : list or None
+        A list of strings specifying the names of the images generated by
+        calls to `.Figure.savefig`.
+
+        If *None*, the test function must use the ``baseline_images`` fixture,
+        either as a parameter or with `pytest.mark.usefixtures`. This value is
+        only allowed when using pytest.
+
+    extensions : None or list of str
+        The list of extensions to test, e.g. ``['png', 'pdf']``.
+
+        If *None*, defaults to all supported extensions: png, pdf, and svg.
+
+        When testing a single extension, it can be directly included in the
+        names passed to *baseline_images*.  In that case, *extensions* must not
+        be set.
+
+        In order to keep the size of the test suite from ballooning, we only
+        include the ``svg`` or ``pdf`` outputs if the test is explicitly
+        exercising a feature dependent on that backend (see also the
+        `check_figures_equal` decorator for that purpose).
+
+    tol : float, default: 0
+        The RMS threshold above which the test is considered failed.
+
+        Due to expected small differences in floating-point calculations, on
+        32-bit systems an additional 0.06 is added to this threshold.
+
+    freetype_version : str or tuple
+        The expected freetype version or range of versions for this test to
+        pass.
+
+    remove_text : bool
+        Remove the title and tick text from the figure before comparison.  This
+        is useful to make the baseline images independent of variations in text
+        rendering between different versions of FreeType.
+
+        This does not remove other, more deliberate, text, such as legends and
+        annotations.
+
+    savefig_kwarg : dict
+        Optional arguments that are passed to the savefig method.
+
+    style : str, dict, or list
+        The optional style(s) to apply to the image test. The test itself
+        can also apply additional styles if desired. Defaults to ``["classic",
+        "_classic_test_patch"]``.
+    """
+
+    if baseline_images is not None:
+        # List of non-empty filename extensions.
+        baseline_exts = [*filter(None, {Path(baseline).suffix[1:]
+                                        for baseline in baseline_images})]
+        if baseline_exts:
+            if extensions is not None:
+                raise ValueError(
+                    "When including extensions directly in 'baseline_images', "
+                    "'extensions' cannot be set as well")
+            if len(baseline_exts) > 1:
+                raise ValueError(
+                    "When including extensions directly in 'baseline_images', "
+                    "all baselines must share the same suffix")
+            extensions = baseline_exts
+            baseline_images = [  # Chop suffix out from baseline_images.
+                Path(baseline).stem for baseline in baseline_images]
+    if extensions is None:
+        # Default extensions to test, if not set via baseline_images.
+        extensions = ['png', 'pdf', 'svg']
+    if savefig_kwarg is None:
+        savefig_kwarg = dict()  # default no kwargs to savefig
+    if sys.maxsize <= 2**32:
+        tol += 0.06
+    return _pytest_image_comparison(
+        baseline_images=baseline_images, extensions=extensions, tol=tol,
+        freetype_version=freetype_version, remove_text=remove_text,
+        savefig_kwargs=savefig_kwarg, style=style)
+
+
+def check_figures_equal(*, extensions=("png", "pdf", "svg"), tol=0):
+    """
+    Decorator for test cases that generate and compare two figures.
+
+    The decorated function must take two keyword arguments, *fig_test*
+    and *fig_ref*, and draw the test and reference images on them.
+    After the function returns, the figures are saved and compared.
+
+    This decorator should be preferred over `image_comparison` when possible in
+    order to keep the size of the test suite from ballooning.
+
+    Parameters
+    ----------
+    extensions : list, default: ["png", "pdf", "svg"]
+        The extensions to test.
+    tol : float
+        The RMS threshold above which the test is considered failed.
+
+    Raises
+    ------
+    RuntimeError
+        If any new figures are created (and not subsequently closed) inside
+        the test function.
+
+    Examples
+    --------
+    Check that calling `.Axes.plot` with a single argument plots it against
+    ``[0, 1, 2, ...]``::
+
+        @check_figures_equal()
+        def test_plot(fig_test, fig_ref):
+            fig_test.subplots().plot([1, 3, 5])
+            fig_ref.subplots().plot([0, 1, 2], [1, 3, 5])
+
+    """
+    ALLOWED_CHARS = set(string.digits + string.ascii_letters + '_-[]()')
+    KEYWORD_ONLY = inspect.Parameter.KEYWORD_ONLY
+
+    def decorator(func):
+        import pytest
+
+        _, result_dir = _image_directories(func)
+        old_sig = inspect.signature(func)
+
+        if not {"fig_test", "fig_ref"}.issubset(old_sig.parameters):
+            raise ValueError("The decorated function must have at least the "
+                             "parameters 'fig_test' and 'fig_ref', but your "
+                             f"function has the signature {old_sig}")
+
+        @pytest.mark.parametrize("ext", extensions)
+        def wrapper(*args, ext, request, **kwargs):
+            if 'ext' in old_sig.parameters:
+                kwargs['ext'] = ext
+            if 'request' in old_sig.parameters:
+                kwargs['request'] = request
+
+            file_name = "".join(c for c in request.node.name
+                                if c in ALLOWED_CHARS)
+            try:
+                fig_test = plt.figure("test")
+                fig_ref = plt.figure("reference")
+                with _collect_new_figures() as figs:
+                    func(*args, fig_test=fig_test, fig_ref=fig_ref, **kwargs)
+                if figs:
+                    raise RuntimeError('Number of open figures changed during '
+                                       'test. Make sure you are plotting to '
+                                       'fig_test or fig_ref, or if this is '
+                                       'deliberate explicitly close the '
+                                       'new figure(s) inside the test.')
+                test_image_path = result_dir / (file_name + "." + ext)
+                ref_image_path = result_dir / (file_name + "-expected." + ext)
+                fig_test.savefig(test_image_path)
+                fig_ref.savefig(ref_image_path)
+                _raise_on_image_difference(
+                    ref_image_path, test_image_path, tol=tol
+                )
+            finally:
+                plt.close(fig_test)
+                plt.close(fig_ref)
+
+        parameters = [
+            param
+            for param in old_sig.parameters.values()
+            if param.name not in {"fig_test", "fig_ref"}
+        ]
+        if 'ext' not in old_sig.parameters:
+            parameters += [inspect.Parameter("ext", KEYWORD_ONLY)]
+        if 'request' not in old_sig.parameters:
+            parameters += [inspect.Parameter("request", KEYWORD_ONLY)]
+        new_sig = old_sig.replace(parameters=parameters)
+        wrapper.__signature__ = new_sig
+
+        # reach a bit into pytest internals to hoist the marks from
+        # our wrapped function
+        new_marks = getattr(func, "pytestmark", []) + wrapper.pytestmark
+        wrapper.pytestmark = new_marks
+
+        return wrapper
+
+    return decorator
+
+
+def _image_directories(func):
+    """
+    Compute the baseline and result image directories for testing *func*.
+
+    For test module ``foo.bar.test_baz``, the baseline directory is at
+    ``foo/bar/baseline_images/test_baz`` and the result directory at
+    ``$(pwd)/result_images/test_baz``.  The result directory is created if it
+    doesn't exist.
+    """
+    module_path = Path(inspect.getfile(func))
+    baseline_dir = module_path.parent / "baseline_images" / module_path.stem
+    result_dir = Path().resolve() / "result_images" / module_path.stem
+    result_dir.mkdir(parents=True, exist_ok=True)
+    return baseline_dir, result_dir

venv/lib/python3.12/site-packages/matplotlib/testing/decorators.pyi

@@ -0,0 +1,25 @@
+from collections.abc import Callable, Sequence
+from pathlib import Path
+from typing import Any, TypeVar
+from typing_extensions import ParamSpec
+
+from matplotlib.figure import Figure
+from matplotlib.typing import RcStyleType
+
+_P = ParamSpec("_P")
+_R = TypeVar("_R")
+
+def remove_ticks_and_titles(figure: Figure) -> None: ...
+def image_comparison(
+    baseline_images: list[str] | None,
+    extensions: list[str] | None = ...,
+    tol: float = ...,
+    freetype_version: tuple[str, str] | str | None = ...,
+    remove_text: bool = ...,
+    savefig_kwarg: dict[str, Any] | None = ...,
+    style: RcStyleType = ...,
+) -> Callable[[Callable[_P, _R]], Callable[_P, _R]]: ...
+def check_figures_equal(
+    *, extensions: Sequence[str] = ..., tol: float = ...
+) -> Callable[[Callable[_P, _R]], Callable[_P, _R]]: ...
+def _image_directories(func: Callable) -> tuple[Path, Path]: ...

venv/lib/python3.12/site-packages/matplotlib/testing/exceptions.py

@@ -0,0 +1,4 @@
+class ImageComparisonFailure(AssertionError):
+    """
+    Raise this exception to mark a test as a comparison between two images.
+    """

venv/lib/python3.12/site-packages/matplotlib/testing/jpl_units/Duration.py

@@ -0,0 +1,138 @@
+"""Duration module."""
+
+import functools
+import operator
+
+from matplotlib import _api
+
+
+class Duration:
+    """Class Duration in development."""
+
+    allowed = ["ET", "UTC"]
+
+    def __init__(self, frame, seconds):
+        """
+        Create a new Duration object.
+
+        = ERROR CONDITIONS
+        - If the input frame is not in the allowed list, an error is thrown.
+
+        = INPUT VARIABLES
+        - frame     The frame of the duration.  Must be 'ET' or 'UTC'
+        - seconds  The number of seconds in the Duration.
+        """
+        _api.check_in_list(self.allowed, frame=frame)
+        self._frame = frame
+        self._seconds = seconds
+
+    def frame(self):
+        """Return the frame the duration is in."""
+        return self._frame
+
+    def __abs__(self):
+        """Return the absolute value of the duration."""
+        return Duration(self._frame, abs(self._seconds))
+
+    def __neg__(self):
+        """Return the negative value of this Duration."""
+        return Duration(self._frame, -self._seconds)
+
+    def seconds(self):
+        """Return the number of seconds in the Duration."""
+        return self._seconds
+
+    def __bool__(self):
+        return self._seconds != 0
+
+    def _cmp(self, op, rhs):
+        """
+        Check that *self* and *rhs* share frames; compare them using *op*.
+        """
+        self.checkSameFrame(rhs, "compare")
+        return op(self._seconds, rhs._seconds)
+
+    __eq__ = functools.partialmethod(_cmp, operator.eq)
+    __ne__ = functools.partialmethod(_cmp, operator.ne)
+    __lt__ = functools.partialmethod(_cmp, operator.lt)
+    __le__ = functools.partialmethod(_cmp, operator.le)
+    __gt__ = functools.partialmethod(_cmp, operator.gt)
+    __ge__ = functools.partialmethod(_cmp, operator.ge)
+
+    def __add__(self, rhs):
+        """
+        Add two Durations.
+
+        = ERROR CONDITIONS
+        - If the input rhs is not in the same frame, an error is thrown.
+
+        = INPUT VARIABLES
+        - rhs     The Duration to add.
+
+        = RETURN VALUE
+        - Returns the sum of ourselves and the input Duration.
+        """
+        # Delay-load due to circular dependencies.
+        import matplotlib.testing.jpl_units as U
+
+        if isinstance(rhs, U.Epoch):
+            return rhs + self
+
+        self.checkSameFrame(rhs, "add")
+        return Duration(self._frame, self._seconds + rhs._seconds)
+
+    def __sub__(self, rhs):
+        """
+        Subtract two Durations.
+
+        = ERROR CONDITIONS
+        - If the input rhs is not in the same frame, an error is thrown.
+
+        = INPUT VARIABLES
+        - rhs     The Duration to subtract.
+
+        = RETURN VALUE
+        - Returns the difference of ourselves and the input Duration.
+        """
+        self.checkSameFrame(rhs, "sub")
+        return Duration(self._frame, self._seconds - rhs._seconds)
+
+    def __mul__(self, rhs):
+        """
+        Scale a UnitDbl by a value.
+
+        = INPUT VARIABLES
+        - rhs     The scalar to multiply by.
+
+        = RETURN VALUE
+        - Returns the scaled Duration.
+        """
+        return Duration(self._frame, self._seconds * float(rhs))
+
+    __rmul__ = __mul__
+
+    def __str__(self):
+        """Print the Duration."""
+        return f"{self._seconds:g} {self._frame}"
+
+    def __repr__(self):
+        """Print the Duration."""
+        return f"Duration('{self._frame}', {self._seconds:g})"
+
+    def checkSameFrame(self, rhs, func):
+        """
+        Check to see if frames are the same.
+
+        = ERROR CONDITIONS
+        - If the frame of the rhs Duration is not the same as our frame,
+          an error is thrown.
+
+        = INPUT VARIABLES
+        - rhs     The Duration to check for the same frame
+        - func    The name of the function doing the check.
+        """
+        if self._frame != rhs._frame:
+            raise ValueError(
+                f"Cannot {func} Durations with different frames.\n"
+                f"LHS: {self._frame}\n"
+                f"RHS: {rhs._frame}")

venv/lib/python3.12/site-packages/matplotlib/testing/jpl_units/Epoch.py

@@ -0,0 +1,211 @@
+"""Epoch module."""
+
+import functools
+import operator
+import math
+import datetime as DT
+
+from matplotlib import _api
+from matplotlib.dates import date2num
+
+
+class Epoch:
+    # Frame conversion offsets in seconds
+    # t(TO) = t(FROM) + allowed[ FROM ][ TO ]
+    allowed = {
+        "ET": {
+            "UTC": +64.1839,
+            },
+        "UTC": {
+            "ET": -64.1839,
+            },
+        }
+
+    def __init__(self, frame, sec=None, jd=None, daynum=None, dt=None):
+        """
+        Create a new Epoch object.
+
+        Build an epoch 1 of 2 ways:
+
+        Using seconds past a Julian date:
+        #   Epoch('ET', sec=1e8, jd=2451545)
+
+        or using a matplotlib day number
+        #   Epoch('ET', daynum=730119.5)
+
+        = ERROR CONDITIONS
+        - If the input units are not in the allowed list, an error is thrown.
+
+        = INPUT VARIABLES
+        - frame     The frame of the epoch.  Must be 'ET' or 'UTC'
+        - sec        The number of seconds past the input JD.
+        - jd         The Julian date of the epoch.
+        - daynum    The matplotlib day number of the epoch.
+        - dt         A python datetime instance.
+        """
+        if ((sec is None and jd is not None) or
+                (sec is not None and jd is None) or
+                (daynum is not None and
+                 (sec is not None or jd is not None)) or
+                (daynum is None and dt is None and
+                 (sec is None or jd is None)) or
+                (daynum is not None and dt is not None) or
+                (dt is not None and (sec is not None or jd is not None)) or
+                ((dt is not None) and not isinstance(dt, DT.datetime))):
+            raise ValueError(
+                "Invalid inputs.  Must enter sec and jd together, "
+                "daynum by itself, or dt (must be a python datetime).\n"
+                "Sec = %s\n"
+                "JD  = %s\n"
+                "dnum= %s\n"
+                "dt  = %s" % (sec, jd, daynum, dt))
+
+        _api.check_in_list(self.allowed, frame=frame)
+        self._frame = frame
+
+        if dt is not None:
+            daynum = date2num(dt)
+
+        if daynum is not None:
+            # 1-JAN-0001 in JD = 1721425.5
+            jd = float(daynum) + 1721425.5
+            self._jd = math.floor(jd)
+            self._seconds = (jd - self._jd) * 86400.0
+
+        else:
+            self._seconds = float(sec)
+            self._jd = float(jd)
+
+            # Resolve seconds down to [ 0, 86400)
+            deltaDays = math.floor(self._seconds / 86400)
+            self._jd += deltaDays
+            self._seconds -= deltaDays * 86400.0
+
+    def convert(self, frame):
+        if self._frame == frame:
+            return self
+
+        offset = self.allowed[self._frame][frame]
+
+        return Epoch(frame, self._seconds + offset, self._jd)
+
+    def frame(self):
+        return self._frame
+
+    def julianDate(self, frame):
+        t = self
+        if frame != self._frame:
+            t = self.convert(frame)
+
+        return t._jd + t._seconds / 86400.0
+
+    def secondsPast(self, frame, jd):
+        t = self
+        if frame != self._frame:
+            t = self.convert(frame)
+
+        delta = t._jd - jd
+        return t._seconds + delta * 86400
+
+    def _cmp(self, op, rhs):
+        """Compare Epochs *self* and *rhs* using operator *op*."""
+        t = self
+        if self._frame != rhs._frame:
+            t = self.convert(rhs._frame)
+        if t._jd != rhs._jd:
+            return op(t._jd, rhs._jd)
+        return op(t._seconds, rhs._seconds)
+
+    __eq__ = functools.partialmethod(_cmp, operator.eq)
+    __ne__ = functools.partialmethod(_cmp, operator.ne)
+    __lt__ = functools.partialmethod(_cmp, operator.lt)
+    __le__ = functools.partialmethod(_cmp, operator.le)
+    __gt__ = functools.partialmethod(_cmp, operator.gt)
+    __ge__ = functools.partialmethod(_cmp, operator.ge)
+
+    def __add__(self, rhs):
+        """
+        Add a duration to an Epoch.
+
+        = INPUT VARIABLES
+        - rhs     The Epoch to subtract.
+
+        = RETURN VALUE
+        - Returns the difference of ourselves and the input Epoch.
+        """
+        t = self
+        if self._frame != rhs.frame():
+            t = self.convert(rhs._frame)
+
+        sec = t._seconds + rhs.seconds()
+
+        return Epoch(t._frame, sec, t._jd)
+
+    def __sub__(self, rhs):
+        """
+        Subtract two Epoch's or a Duration from an Epoch.
+
+        Valid:
+        Duration = Epoch - Epoch
+        Epoch = Epoch - Duration
+
+        = INPUT VARIABLES
+        - rhs     The Epoch to subtract.
+
+        = RETURN VALUE
+        - Returns either the duration between to Epoch's or the a new
+          Epoch that is the result of subtracting a duration from an epoch.
+        """
+        # Delay-load due to circular dependencies.
+        import matplotlib.testing.jpl_units as U
+
+        # Handle Epoch - Duration
+        if isinstance(rhs, U.Duration):
+            return self + -rhs
+
+        t = self
+        if self._frame != rhs._frame:
+            t = self.convert(rhs._frame)
+
+        days = t._jd - rhs._jd
+        sec = t._seconds - rhs._seconds
+
+        return U.Duration(rhs._frame, days*86400 + sec)
+
+    def __str__(self):
+        """Print the Epoch."""
+        return f"{self.julianDate(self._frame):22.15e} {self._frame}"
+
+    def __repr__(self):
+        """Print the Epoch."""
+        return str(self)
+
+    @staticmethod
+    def range(start, stop, step):
+        """
+        Generate a range of Epoch objects.
+
+        Similar to the Python range() method.  Returns the range [
+        start, stop) at the requested step.  Each element will be a
+        Epoch object.
+
+        = INPUT VARIABLES
+        - start     The starting value of the range.
+        - stop      The stop value of the range.
+        - step      Step to use.
+
+        = RETURN VALUE
+        - Returns a list containing the requested Epoch values.
+        """
+        elems = []
+
+        i = 0
+        while True:
+            d = start + i * step
+            if d >= stop:
+                break
+
+            elems.append(d)
+            i += 1
+
+        return elems

venv/lib/python3.12/site-packages/matplotlib/testing/jpl_units/EpochConverter.py

@@ -0,0 +1,94 @@
+"""EpochConverter module containing class EpochConverter."""
+
+from matplotlib import cbook, units
+import matplotlib.dates as date_ticker
+
+__all__ = ['EpochConverter']
+
+
+class EpochConverter(units.ConversionInterface):
+    """
+    Provides Matplotlib conversion functionality for Monte Epoch and Duration
+    classes.
+    """
+
+    jdRef = 1721425.5
+
+    @staticmethod
+    def axisinfo(unit, axis):
+        # docstring inherited
+        majloc = date_ticker.AutoDateLocator()
+        majfmt = date_ticker.AutoDateFormatter(majloc)
+        return units.AxisInfo(majloc=majloc, majfmt=majfmt, label=unit)
+
+    @staticmethod
+    def float2epoch(value, unit):
+        """
+        Convert a Matplotlib floating-point date into an Epoch of the specified
+        units.
+
+        = INPUT VARIABLES
+        - value     The Matplotlib floating-point date.
+        - unit      The unit system to use for the Epoch.
+
+        = RETURN VALUE
+        - Returns the value converted to an Epoch in the specified time system.
+        """
+        # Delay-load due to circular dependencies.
+        import matplotlib.testing.jpl_units as U
+
+        secPastRef = value * 86400.0 * U.UnitDbl(1.0, 'sec')
+        return U.Epoch(unit, secPastRef, EpochConverter.jdRef)
+
+    @staticmethod
+    def epoch2float(value, unit):
+        """
+        Convert an Epoch value to a float suitable for plotting as a python
+        datetime object.
+
+        = INPUT VARIABLES
+        - value    An Epoch or list of Epochs that need to be converted.
+        - unit     The units to use for an axis with Epoch data.
+
+        = RETURN VALUE
+        - Returns the value parameter converted to floats.
+        """
+        return value.julianDate(unit) - EpochConverter.jdRef
+
+    @staticmethod
+    def duration2float(value):
+        """
+        Convert a Duration value to a float suitable for plotting as a python
+        datetime object.
+
+        = INPUT VARIABLES
+        - value    A Duration or list of Durations that need to be converted.
+
+        = RETURN VALUE
+        - Returns the value parameter converted to floats.
+        """
+        return value.seconds() / 86400.0
+
+    @staticmethod
+    def convert(value, unit, axis):
+        # docstring inherited
+
+        # Delay-load due to circular dependencies.
+        import matplotlib.testing.jpl_units as U
+
+        if not cbook.is_scalar_or_string(value):
+            return [EpochConverter.convert(x, unit, axis) for x in value]
+        if unit is None:
+            unit = EpochConverter.default_units(value, axis)
+        if isinstance(value, U.Duration):
+            return EpochConverter.duration2float(value)
+        else:
+            return EpochConverter.epoch2float(value, unit)
+
+    @staticmethod
+    def default_units(value, axis):
+        # docstring inherited
+        if cbook.is_scalar_or_string(value):
+            return value.frame()
+        else:
+            return EpochConverter.default_units(value[0], axis)

venv/lib/python3.12/site-packages/matplotlib/testing/jpl_units/StrConverter.py

@@ -0,0 +1,97 @@
+"""StrConverter module containing class StrConverter."""
+
+import numpy as np
+
+import matplotlib.units as units
+
+__all__ = ['StrConverter']
+
+
+class StrConverter(units.ConversionInterface):
+    """
+    A Matplotlib converter class for string data values.
+
+    Valid units for string are:
+    - 'indexed' : Values are indexed as they are specified for plotting.
+    - 'sorted'  : Values are sorted alphanumerically.
+    - 'inverted' : Values are inverted so that the first value is on top.
+    - 'sorted-inverted' :  A combination of 'sorted' and 'inverted'
+    """
+
+    @staticmethod
+    def axisinfo(unit, axis):
+        # docstring inherited
+        return None
+
+    @staticmethod
+    def convert(value, unit, axis):
+        # docstring inherited
+
+        if value == []:
+            return []
+
+        # we delay loading to make matplotlib happy
+        ax = axis.axes
+        if axis is ax.xaxis:
+            isXAxis = True
+        else:
+            isXAxis = False
+
+        axis.get_major_ticks()
+        ticks = axis.get_ticklocs()
+        labels = axis.get_ticklabels()
+
+        labels = [l.get_text() for l in labels if l.get_text()]
+
+        if not labels:
+            ticks = []
+            labels = []
+
+        if not np.iterable(value):
+            value = [value]
+
+        newValues = []
+        for v in value:
+            if v not in labels and v not in newValues:
+                newValues.append(v)
+
+        labels.extend(newValues)
+
+        # DISABLED: This is disabled because matplotlib bar plots do not
+        # DISABLED: recalculate the unit conversion of the data values
+        # DISABLED: this is due to design and is not really a bug.
+        # DISABLED: If this gets changed, then we can activate the following
+        # DISABLED: block of code.  Note that this works for line plots.
+        # DISABLED if unit:
+        # DISABLED     if unit.find("sorted") > -1:
+        # DISABLED         labels.sort()
+        # DISABLED     if unit.find("inverted") > -1:
+        # DISABLED         labels = labels[::-1]
+
+        # add padding (so they do not appear on the axes themselves)
+        labels = [''] + labels + ['']
+        ticks = list(range(len(labels)))
+        ticks[0] = 0.5
+        ticks[-1] = ticks[-1] - 0.5
+
+        axis.set_ticks(ticks)
+        axis.set_ticklabels(labels)
+        # we have to do the following lines to make ax.autoscale_view work
+        loc = axis.get_major_locator()
+        loc.set_bounds(ticks[0], ticks[-1])
+
+        if isXAxis:
+            ax.set_xlim(ticks[0], ticks[-1])
+        else:
+            ax.set_ylim(ticks[0], ticks[-1])
+
+        result = [ticks[labels.index(v)] for v in value]
+
+        ax.viewLim.ignore(-1)
+        return result
+
+    @staticmethod
+    def default_units(value, axis):
+        # docstring inherited
+        # The default behavior for string indexing.
+        return "indexed"

venv/lib/python3.12/site-packages/matplotlib/testing/jpl_units/UnitDbl.py

@@ -0,0 +1,180 @@
+"""UnitDbl module."""
+
+import functools
+import operator
+
+from matplotlib import _api
+
+
+class UnitDbl:
+    """Class UnitDbl in development."""
+
+    # Unit conversion table.  Small subset of the full one but enough
+    # to test the required functions.  First field is a scale factor to
+    # convert the input units to the units of the second field.  Only
+    # units in this table are allowed.
+    allowed = {
+        "m": (0.001, "km"),
+        "km": (1, "km"),
+        "mile": (1.609344, "km"),
+
+        "rad": (1, "rad"),
+        "deg": (1.745329251994330e-02, "rad"),
+
+        "sec": (1, "sec"),
+        "min": (60.0, "sec"),
+        "hour": (3600, "sec"),
+        }
+
+    _types = {
+        "km": "distance",
+        "rad": "angle",
+        "sec": "time",
+        }
+
+    def __init__(self, value, units):
+        """
+        Create a new UnitDbl object.
+
+        Units are internally converted to km, rad, and sec.  The only
+        valid inputs for units are [m, km, mile, rad, deg, sec, min, hour].
+
+        The field UnitDbl.value will contain the converted value.  Use
+        the convert() method to get a specific type of units back.
+
+        = ERROR CONDITIONS
+        - If the input units are not in the allowed list, an error is thrown.
+
+        = INPUT VARIABLES
+        - value     The numeric value of the UnitDbl.
+        - units     The string name of the units the value is in.
+        """
+        data = _api.check_getitem(self.allowed, units=units)
+        self._value = float(value * data[0])
+        self._units = data[1]
+
+    def convert(self, units):
+        """
+        Convert the UnitDbl to a specific set of units.
+
+        = ERROR CONDITIONS
+        - If the input units are not in the allowed list, an error is thrown.
+
+        = INPUT VARIABLES
+        - units     The string name of the units to convert to.
+
+        = RETURN VALUE
+        - Returns the value of the UnitDbl in the requested units as a floating
+          point number.
+        """
+        if self._units == units:
+            return self._value
+        data = _api.check_getitem(self.allowed, units=units)
+        if self._units != data[1]:
+            raise ValueError(f"Error trying to convert to different units.\n"
+                             f"    Invalid conversion requested.\n"
+                             f"    UnitDbl: {self}\n"
+                             f"    Units:   {units}\n")
+        return self._value / data[0]
+
+    def __abs__(self):
+        """Return the absolute value of this UnitDbl."""
+        return UnitDbl(abs(self._value), self._units)
+
+    def __neg__(self):
+        """Return the negative value of this UnitDbl."""
+        return UnitDbl(-self._value, self._units)
+
+    def __bool__(self):
+        """Return the truth value of a UnitDbl."""
+        return bool(self._value)
+
+    def _cmp(self, op, rhs):
+        """Check that *self* and *rhs* share units; compare them using *op*."""
+        self.checkSameUnits(rhs, "compare")
+        return op(self._value, rhs._value)
+
+    __eq__ = functools.partialmethod(_cmp, operator.eq)
+    __ne__ = functools.partialmethod(_cmp, operator.ne)
+    __lt__ = functools.partialmethod(_cmp, operator.lt)
+    __le__ = functools.partialmethod(_cmp, operator.le)
+    __gt__ = functools.partialmethod(_cmp, operator.gt)
+    __ge__ = functools.partialmethod(_cmp, operator.ge)
+
+    def _binop_unit_unit(self, op, rhs):
+        """Check that *self* and *rhs* share units; combine them using *op*."""
+        self.checkSameUnits(rhs, op.__name__)
+        return UnitDbl(op(self._value, rhs._value), self._units)
+
+    __add__ = functools.partialmethod(_binop_unit_unit, operator.add)
+    __sub__ = functools.partialmethod(_binop_unit_unit, operator.sub)
+
+    def _binop_unit_scalar(self, op, scalar):
+        """Combine *self* and *scalar* using *op*."""
+        return UnitDbl(op(self._value, scalar), self._units)
+
+    __mul__ = functools.partialmethod(_binop_unit_scalar, operator.mul)
+    __rmul__ = functools.partialmethod(_binop_unit_scalar, operator.mul)
+
+    def __str__(self):
+        """Print the UnitDbl."""
+        return f"{self._value:g} *{self._units}"
+
+    def __repr__(self):
+        """Print the UnitDbl."""
+        return f"UnitDbl({self._value:g}, '{self._units}')"
+
+    def type(self):
+        """Return the type of UnitDbl data."""
+        return self._types[self._units]
+
+    @staticmethod
+    def range(start, stop, step=None):
+        """
+        Generate a range of UnitDbl objects.
+
+        Similar to the Python range() method.  Returns the range [
+        start, stop) at the requested step.  Each element will be a
+        UnitDbl object.
+
+        = INPUT VARIABLES
+        - start     The starting value of the range.
+        - stop      The stop value of the range.
+        - step      Optional step to use.  If set to None, then a UnitDbl of
+                      value 1 w/ the units of the start is used.
+
+        = RETURN VALUE
+        - Returns a list containing the requested UnitDbl values.
+        """
+        if step is None:
+            step = UnitDbl(1, start._units)
+
+        elems = []
+
+        i = 0
+        while True:
+            d = start + i * step
+            if d >= stop:
+                break
+
+            elems.append(d)
+            i += 1
+
+        return elems
+
+    def checkSameUnits(self, rhs, func):
+        """
+        Check to see if units are the same.
+
+        = ERROR CONDITIONS
+        - If the units of the rhs UnitDbl are not the same as our units,
+          an error is thrown.
+
+        = INPUT VARIABLES
+        - rhs     The UnitDbl to check for the same units
+        - func    The name of the function doing the check.
+        """
+        if self._units != rhs._units:
+            raise ValueError(f"Cannot {func} units of different types.\n"
+                             f"LHS: {self._units}\n"
+                             f"RHS: {rhs._units}")

venv/lib/python3.12/site-packages/matplotlib/testing/jpl_units/UnitDblConverter.py

@@ -0,0 +1,85 @@
+"""UnitDblConverter module containing class UnitDblConverter."""
+
+import numpy as np
+
+from matplotlib import cbook, units
+import matplotlib.projections.polar as polar
+
+__all__ = ['UnitDblConverter']
+
+
+# A special function for use with the matplotlib FuncFormatter class
+# for formatting axes with radian units.
+# This was copied from matplotlib example code.
+def rad_fn(x, pos=None):
+    """Radian function formatter."""
+    n = int((x / np.pi) * 2.0 + 0.25)
+    if n == 0:
+        return str(x)
+    elif n == 1:
+        return r'$\pi/2$'
+    elif n == 2:
+        return r'$\pi$'
+    elif n % 2 == 0:
+        return fr'${n//2}\pi$'
+    else:
+        return fr'${n}\pi/2$'
+
+
+class UnitDblConverter(units.ConversionInterface):
+    """
+    Provides Matplotlib conversion functionality for the Monte UnitDbl class.
+    """
+    # default for plotting
+    defaults = {
+       "distance": 'km',
+       "angle": 'deg',
+       "time": 'sec',
+       }
+
+    @staticmethod
+    def axisinfo(unit, axis):
+        # docstring inherited
+
+        # Delay-load due to circular dependencies.
+        import matplotlib.testing.jpl_units as U
+
+        # Check to see if the value used for units is a string unit value
+        # or an actual instance of a UnitDbl so that we can use the unit
+        # value for the default axis label value.
+        if unit:
+            label = unit if isinstance(unit, str) else unit.label()
+        else:
+            label = None
+
+        if label == "deg" and isinstance(axis.axes, polar.PolarAxes):
+            # If we want degrees for a polar plot, use the PolarPlotFormatter
+            majfmt = polar.PolarAxes.ThetaFormatter()
+        else:
+            majfmt = U.UnitDblFormatter(useOffset=False)
+
+        return units.AxisInfo(majfmt=majfmt, label=label)
+
+    @staticmethod
+    def convert(value, unit, axis):
+        # docstring inherited
+        if not cbook.is_scalar_or_string(value):
+            return [UnitDblConverter.convert(x, unit, axis) for x in value]
+        # If no units were specified, then get the default units to use.
+        if unit is None:
+            unit = UnitDblConverter.default_units(value, axis)
+        # Convert the incoming UnitDbl value/values to float/floats
+        if isinstance(axis.axes, polar.PolarAxes) and value.type() == "angle":
+            # Guarantee that units are radians for polar plots.
+            return value.convert("rad")
+        return value.convert(unit)
+
+    @staticmethod
+    def default_units(value, axis):
+        # docstring inherited
+        # Determine the default units based on the user preferences set for
+        # default units when printing a UnitDbl.
+        if cbook.is_scalar_or_string(value):
+            return UnitDblConverter.defaults[value.type()]
+        else:
+            return UnitDblConverter.default_units(value[0], axis)

venv/lib/python3.12/site-packages/matplotlib/testing/jpl_units/UnitDblFormatter.py

@@ -0,0 +1,28 @@
+"""UnitDblFormatter module containing class UnitDblFormatter."""
+
+import matplotlib.ticker as ticker
+
+__all__ = ['UnitDblFormatter']
+
+
+class UnitDblFormatter(ticker.ScalarFormatter):
+    """
+    The formatter for UnitDbl data types.
+
+    This allows for formatting with the unit string.
+    """
+
+    def __call__(self, x, pos=None):
+        # docstring inherited
+        if len(self.locs) == 0:
+            return ''
+        else:
+            return f'{x:.12}'
+
+    def format_data_short(self, value):
+        # docstring inherited
+        return f'{value:.12}'
+
+    def format_data(self, value):
+        # docstring inherited
+        return f'{value:.12}'

venv/lib/python3.12/site-packages/matplotlib/testing/jpl_units/__init__.py

@@ -0,0 +1,76 @@
+"""
+A sample set of units for use with testing unit conversion
+of Matplotlib routines.  These are used because they use very strict
+enforcement of unitized data which will test the entire spectrum of how
+unitized data might be used (it is not always meaningful to convert to
+a float without specific units given).
+
+UnitDbl is essentially a unitized floating point number.  It has a
+minimal set of supported units (enough for testing purposes).  All
+of the mathematical operation are provided to fully test any behaviour
+that might occur with unitized data.  Remember that unitized data has
+rules as to how it can be applied to one another (a value of distance
+cannot be added to a value of time).  Thus we need to guard against any
+accidental "default" conversion that will strip away the meaning of the
+data and render it neutered.
+
+Epoch is different than a UnitDbl of time.  Time is something that can be
+measured where an Epoch is a specific moment in time.  Epochs are typically
+referenced as an offset from some predetermined epoch.
+
+A difference of two epochs is a Duration.  The distinction between a Duration
+and a UnitDbl of time is made because an Epoch can have different frames (or
+units).  In the case of our test Epoch class the two allowed frames are 'UTC'
+and 'ET' (Note that these are rough estimates provided for testing purposes
+and should not be used in production code where accuracy of time frames is
+desired).  As such a Duration also has a frame of reference and therefore needs
+to be called out as different that a simple measurement of time since a delta-t
+in one frame may not be the same in another.
+"""
+
+from .Duration import Duration
+from .Epoch import Epoch
+from .UnitDbl import UnitDbl
+
+from .StrConverter import StrConverter
+from .EpochConverter import EpochConverter
+from .UnitDblConverter import UnitDblConverter
+
+from .UnitDblFormatter import UnitDblFormatter
+
+
+__version__ = "1.0"
+
+__all__ = [
+            'register',
+            'Duration',
+            'Epoch',
+            'UnitDbl',
+            'UnitDblFormatter',
+          ]
+
+
+def register():
+    """Register the unit conversion classes with matplotlib."""
+    import matplotlib.units as mplU
+
+    mplU.registry[str] = StrConverter()
+    mplU.registry[Epoch] = EpochConverter()
+    mplU.registry[Duration] = EpochConverter()
+    mplU.registry[UnitDbl] = UnitDblConverter()
+
+
+# Some default unit instances
+# Distances
+m = UnitDbl(1.0, "m")
+km = UnitDbl(1.0, "km")
+mile = UnitDbl(1.0, "mile")
+# Angles
+deg = UnitDbl(1.0, "deg")
+rad = UnitDbl(1.0, "rad")
+# Time
+sec = UnitDbl(1.0, "sec")
+min = UnitDbl(1.0, "min")
+hr = UnitDbl(1.0, "hour")
+day = UnitDbl(24.0, "hour")
+sec = UnitDbl(1.0, "sec")

venv/lib/python3.12/site-packages/matplotlib/testing/widgets.py

@@ -0,0 +1,119 @@
+"""
+========================
+Widget testing utilities
+========================
+
+See also :mod:`matplotlib.tests.test_widgets`.
+"""
+
+from unittest import mock
+
+import matplotlib.pyplot as plt
+
+
+def get_ax():
+    """Create a plot and return its Axes."""
+    fig, ax = plt.subplots(1, 1)
+    ax.plot([0, 200], [0, 200])
+    ax.set_aspect(1.0)
+    ax.figure.canvas.draw()
+    return ax
+
+
+def noop(*args, **kwargs):
+    pass
+
+
+def mock_event(ax, button=1, xdata=0, ydata=0, key=None, step=1):
+    r"""
+    Create a mock event that can stand in for `.Event` and its subclasses.
+
+    This event is intended to be used in tests where it can be passed into
+    event handling functions.
+
+    Parameters
+    ----------
+    ax : `~matplotlib.axes.Axes`
+        The Axes the event will be in.
+    xdata : float
+        x coord of mouse in data coords.
+    ydata : float
+        y coord of mouse in data coords.
+    button : None or `MouseButton` or {'up', 'down'}
+        The mouse button pressed in this event (see also `.MouseEvent`).
+    key : None or str
+        The key pressed when the mouse event triggered (see also `.KeyEvent`).
+    step : int
+        Number of scroll steps (positive for 'up', negative for 'down').
+
+    Returns
+    -------
+    event
+        A `.Event`\-like Mock instance.
+    """
+    event = mock.Mock()
+    event.button = button
+    event.x, event.y = ax.transData.transform([(xdata, ydata),
+                                               (xdata, ydata)])[0]
+    event.xdata, event.ydata = xdata, ydata
+    event.inaxes = ax
+    event.canvas = ax.figure.canvas
+    event.key = key
+    event.step = step
+    event.guiEvent = None
+    event.name = 'Custom'
+    return event
+
+
+def do_event(tool, etype, button=1, xdata=0, ydata=0, key=None, step=1):
+    """
+    Trigger an event on the given tool.
+
+    Parameters
+    ----------
+    tool : matplotlib.widgets.AxesWidget
+    etype : str
+        The event to trigger.
+    xdata : float
+        x coord of mouse in data coords.
+    ydata : float
+        y coord of mouse in data coords.
+    button : None or `MouseButton` or {'up', 'down'}
+        The mouse button pressed in this event (see also `.MouseEvent`).
+    key : None or str
+        The key pressed when the mouse event triggered (see also `.KeyEvent`).
+    step : int
+        Number of scroll steps (positive for 'up', negative for 'down').
+    """
+    event = mock_event(tool.ax, button, xdata, ydata, key, step)
+    func = getattr(tool, etype)
+    func(event)
+
+
+def click_and_drag(tool, start, end, key=None):
+    """
+    Helper to simulate a mouse drag operation.
+
+    Parameters
+    ----------
+    tool : `~matplotlib.widgets.Widget`
+    start : [float, float]
+        Starting point in data coordinates.
+    end : [float, float]
+        End point in data coordinates.
+    key : None or str
+         An optional key that is pressed during the whole operation
+         (see also `.KeyEvent`).
+    """
+    if key is not None:
+        # Press key
+        do_event(tool, 'on_key_press', xdata=start[0], ydata=start[1],
+                 button=1, key=key)
+    # Click, move, and release mouse
+    do_event(tool, 'press', xdata=start[0], ydata=start[1], button=1)
+    do_event(tool, 'onmove', xdata=end[0], ydata=end[1], button=1)
+    do_event(tool, 'release', xdata=end[0], ydata=end[1], button=1)
+    if key is not None:
+        # Release key
+        do_event(tool, 'on_key_release', xdata=end[0], ydata=end[1],
+                 button=1, key=key)

venv/lib/python3.12/site-packages/matplotlib/testing/widgets.pyi

@@ -0,0 +1,31 @@
+from typing import Any, Literal
+
+from matplotlib.axes import Axes
+from matplotlib.backend_bases import Event, MouseButton
+from matplotlib.widgets import AxesWidget, Widget
+
+def get_ax() -> Axes: ...
+def noop(*args: Any, **kwargs: Any) -> None: ...
+def mock_event(
+    ax: Axes,
+    button: MouseButton | int | Literal["up", "down"] | None = ...,
+    xdata: float = ...,
+    ydata: float = ...,
+    key: str | None = ...,
+    step: int = ...,
+) -> Event: ...
+def do_event(
+    tool: AxesWidget,
+    etype: str,
+    button: MouseButton | int | Literal["up", "down"] | None = ...,
+    xdata: float = ...,
+    ydata: float = ...,
+    key: str | None = ...,
+    step: int = ...,
+) -> None: ...
+def click_and_drag(
+    tool: Widget,
+    start: tuple[float, float],
+    end: tuple[float, float],
+    key: str | None = ...,
+) -> None: ...