TST: register custom marks

tacaswell · tacaswell · commit 813d24b4b56d · 2019-05-11T18:23:09.000-04:00
pytest 4.5.0 became more strict about unknown marks
diff --git a/pytest.ini b/pytest.ini
@@ -7,6 +7,8 @@ python_files = test_*.py
 markers =
     backend: Set alternate Matplotlib backend temporarily.
     style: Set alternate Matplotlib style temporarily.
+    baseline_images: Compare output against a known reference
+    pytz: Tests that require pytz to be installed
 
 filterwarnings =
     error
