[TMP] Add test to check if image is freshly built

tests/base-notebook/units/unit_check_file.py

@@ -0,0 +1,8 @@
+# Copyright (c) Jupyter Development Team.
+# Distributed under the terms of the Modified BSD License.
+
+from pathlib import Path
+
+file = Path("/tmp/test-file.txt")
+assert file.exists()
+assert file.read_text() == "test-content\n"