TST: verify warnings fail the test suite

tacaswell · tacaswell · commit 9e7951fc3ac1 · 2019-09-01T15:19:09.000-04:00
diff --git a/lib/matplotlib/tests/test_testing.py b/lib/matplotlib/tests/test_testing.py
@@ -0,0 +1,7 @@
+import warnings
+import pytest
+
+@pytest.mark.xfail(strict=True,
+                   reason="testing that warnings fail tests")
+def test_warn_to_fail():
+    warnings.warn("This should fail the test")
