Better tests directory structure (#2231)

tests/image_specific_tests/docker-stacks-foundation/run-hooks-failures/b.py

@@ -0,0 +1,12 @@
+#!/usr/bin/env python3
+# Copyright (c) Jupyter Development Team.
+# Distributed under the terms of the Modified BSD License.
+import os
+import sys
+
+print("Started: b.py")
+print(f"OTHER_VAR={os.environ['OTHER_VAR']}")
+
+sys.exit(1)
+
+print("Finished: b.py")