matplotlib
diff --git a/‎lib/matplotlib/tests/__init__.py
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+8-4Lines changed: 8 additions & 4 deletions b/‎lib/matplotlib/tests/__init__.py
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+8-4Lines changed: 8 additions & 4 deletions
@@ -1,11 +1,15 @@
-import os
+from distutils.version import LooseVersion
+from pathlib import Path
 
+import pytest
 
-# Check that the test directories exist
-if not os.path.exists(os.path.join(
-        os.path.dirname(__file__), 'baseline_images')):
+
+# Check that the test directories exist.
+if not (Path(__file__).parent / 'baseline_images').exists():
     raise IOError(
         'The baseline image directory does not exist. '
         'This is most likely because the test data is not installed. '
         'You may need to install matplotlib from source to get the '
         'test data.')
+if LooseVersion(pytest.__version__) < "3.6":
+    raise RuntimeError('pytest>=3.6 is required to run the tests')