Merge pull request #10436 from jdufresne/fixture-data

Set TestData.__test__ to False to avoid pytest discovery

Author: uranusjr

news/a9b36e28-beec-4a37-97e1-6dc02ff1eb2d.trivial.rst

@@ -150,6 +150,8 @@ class TestData:
     data into a directory and operating on the copied data.
     """
 
+    __test__ = False
+
     def __init__(self, root, source=None):
         self.source = source or DATA_DIR
         self.root = Path(root).resolve()