Skip additional backend tests on import error

QuLogic · QuLogic · commit dc5b6e87b6f4 · 2022-05-04T20:41:01.000-04:00
All the Qt tests in this file already do this, and the remaining one
fails if running headless.
diff --git a/lib/matplotlib/tests/test_backend_gtk3.py b/lib/matplotlib/tests/test_backend_gtk3.py
@@ -6,7 +6,7 @@
 pytest.importorskip("matplotlib.backends.backend_gtk3agg")
 
 
-@pytest.mark.backend("gtk3agg")
+@pytest.mark.backend("gtk3agg", skip_on_importerror=True)
 def test_correct_key():
     pytest.xfail("test_widget_send_event is not triggering key_press_event")
 
diff --git a/lib/matplotlib/tests/test_backend_qt.py b/lib/matplotlib/tests/test_backend_qt.py
@@ -193,7 +193,7 @@ def test_other_signal_before_sigint(target, kwargs):
     plt.figure()
 
 
-@pytest.mark.backend('Qt5Agg')
+@pytest.mark.backend('Qt5Agg', skip_on_importerror=True)
 def test_fig_sigint_override(qt_core):
     from matplotlib.backends.backend_qt5 import _BackendQT5
     # Create a figure
