Skip wx interactive tests on OSX.

anntzer · anntzer · commit 486ce4023443 · 2018-07-07T11:37:15.000+02:00
It appears that they never worked and were just spuriously skipped
before on CI.  Make the skip explicit and unbreak the build.
diff --git a/lib/matplotlib/tests/test_backends_interactive.py b/lib/matplotlib/tests/test_backends_interactive.py
@@ -29,6 +29,8 @@ def _get_testable_interactive_backends():
             reason = "No $DISPLAY"
         elif any(importlib.util.find_spec(dep) is None for dep in deps):
             reason = "Missing dependency"
+        elif "wx" in deps and sys.platform == "darwin":
+            reason = "wx backends known not to work on OSX"
         backends.append(pytest.mark.skip(reason=reason)(backend) if reason
                         else backend)
     return backends
