tests: validate config docstring is current

tests/test_docs.py

@@ -0,0 +1,16 @@
+from invokeai.app.services.config.config_default import InvokeAIAppConfig
+
+
+def test_app_config_docstrings_are_current():
+    # If this test fails, run `python scripts/generate_config_docstring.py`. See the comments in that script for
+    # an explanation of why this is necessary.
+    #
+    # A make target is provided to run the script: `make update-config-docstring`.
+
+    assert InvokeAIAppConfig.__doc__ is not None
+
+    generated_docstring = InvokeAIAppConfig.generate_docstrings()
+
+    formatted_dunder_docstring = f'    """{InvokeAIAppConfig.__doc__.strip()}\n    """'
+
+    assert generated_docstring == formatted_dunder_docstring