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plotter-app/venv/lib/python3.8/site-packages/matplotlib/testing/conftest.py

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+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 {} ({})."
+                                    .format(backend, exc))
+                    else:
+                        raise
+            # Default of cleanup and image_comparison too.
+            matplotlib.style.use(["classic", "_classic_test_patch"])
+        try:
+            yield
+        finally:
+            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