Add conftest.py file.

colour_visuals/conftest.py

@@ -0,0 +1,43 @@
+"""
+Pytest Configuration
+====================
+
+Configures *pytest* to use the *Matplotlib* *AGG* headless backend. This allows
+the plotting unittests to run without creating windows in IDEs such as
+*VSCode*.
+"""
+
+import matplotlib as mpl
+import pytest
+from colour.hints import Generator
+
+__author__ = "Colour Developers"
+__copyright__ = "Copyright 2013 Colour Developers"
+__license__ = "BSD-3-Clause - https://opensource.org/licenses/BSD-3-Clause"
+__maintainer__ = "Colour Developers"
+__email__ = "[email protected]"
+__status__ = "Production"
+
+__all__ = [
+    "mpl_headless_backend",
+]
+
+
+@pytest.fixture(autouse=True, scope="session")
+def mpl_headless_backend() -> Generator[None, None, None]:
+    """
+    Configure *Matplotlib* for headless testing.
+
+    This pytest fixture is automatically applied to any tests in this package
+    or any subpackages at the beginning of the pytest session.
+
+    Yields
+    ------
+    Generator
+        *Matplotlib* unit tests.
+    """
+
+    current_backend = mpl.get_backend()
+    mpl.use("AGG")
+    yield
+    mpl.use(current_backend)