Allow macosx thread safety test on macOS11

QuLogic · QuLogic · commit 31f4de0f54f1 · 2021-10-05T20:15:54.000-04:00
It appears to no longer timeout on that system, and is breaking CI, which just switched to it. Note, macOS plays games with the version number it reports depending on how Python was compiled: https://eclecticlight.co/2020/08/13/macos-version-numbering-isnt-so-simple/
diff --git a/lib/matplotlib/tests/test_backends_interactive.py b/lib/matplotlib/tests/test_backends_interactive.py
@@ -222,8 +222,14 @@ def _test_thread_impl():
         param.marks.append(
             pytest.mark.xfail(raises=subprocess.CalledProcessError))
     elif backend == "macosx":
-        param.marks.append(
-            pytest.mark.xfail(raises=subprocess.TimeoutExpired, strict=True))
+        from packaging.version import parse
+        mac_ver = platform.mac_ver()[0]
+        # Note, macOS Big Sur is both 11 and 10.16, depending on SDK that
+        # Python was compiled against.
+        if mac_ver and parse(mac_ver) < parse('10.16'):
+            param.marks.append(
+                pytest.mark.xfail(raises=subprocess.TimeoutExpired,
+                                  strict=True))
     elif param.values[0].get("QT_API") == "PySide2":
         param.marks.append(
             pytest.mark.xfail(raises=subprocess.CalledProcessError))
