Update build environment

Author: oscargus

.github/workflows/tests.yml

@@ -48,8 +48,7 @@ jobs:
             XVFB_RUN: xvfb-run -a
           - os: ubuntu-20.04
             python-version: '3.10'
-            # Re-add this when extra dependencies have wheels.
-            # extra-requirements: '-r requirements/testing/extra.txt'
+            extra-requirements: '-r requirements/testing/extra.txt'
             XVFB_RUN: xvfb-run -a
           - os: macos-latest
             python-version: 3.8

lib/matplotlib/tests/test_backends_interactive.py

@@ -512,6 +512,10 @@ def _test_number_of_draws_script():
         # copy_from_bbox only works when rendering to an ImageSurface
         param.marks.append(
             pytest.mark.skip("gtk3cairo does not support blitting"))
+    elif backend == "gtk4cairo":
+        # copy_from_bbox only works when rendering to an ImageSurface
+        param.marks.append(
+            pytest.mark.skip("gtk4cairo does not support blitting"))
     elif backend == "wx":
         param.marks.append(
             pytest.mark.skip("wx does not support blitting"))

lib/matplotlib/tests/test_font_manager.py

@@ -310,5 +310,6 @@ def test_get_font_names():
             pass
     available_fonts = sorted(list(set(ttf_fonts)))
     mpl_font_names = sorted(fontManager.get_font_names())
+    assert set(available_fonts) == set(mpl_font_names)
     assert len(available_fonts) == len(mpl_font_names)
     assert available_fonts == mpl_font_names