Add check for invalid error codes in configuration.

plus test.

Author: rossbar

numpydoc/numpydoc.py

@@ -300,9 +300,17 @@ def update_config(app, config=None):
 
     # Processing to determine whether numpydoc_validation_checks is treated
     # as a blocklist or allowlist
+    valid_error_codes = set(ERROR_MSGS.keys())
     if "all" in config.numpydoc_validation_checks:
         block = deepcopy(config.numpydoc_validation_checks)
-        config.numpydoc_validation_checks = set(ERROR_MSGS.keys()) - block
+        config.numpydoc_validation_checks = valid_error_codes - block
+    # Ensure that the validation check set contains only valid error codes
+    invalid_error_codes = config.numpydoc_validation_checks - valid_error_codes
+    if invalid_error_codes:
+        raise ValueError(
+            f"Unrecognized validation code(s) in numpydoc_validation_checks "
+            f"config value: {invalid_error_codes}"
+        )
 
 
 # ------------------------------------------------------------------------------

numpydoc/tests/test_numpydoc.py

@@ -2,7 +2,9 @@
 import pytest
 from io import StringIO
 from copy import deepcopy
-from numpydoc.numpydoc import mangle_docstrings, _clean_text_signature
+from numpydoc.numpydoc import (
+    mangle_docstrings, _clean_text_signature, update_config
+)
 from numpydoc.xref import DEFAULT_LINKS
 from sphinx.ext.autodoc import ALL
 from sphinx.util import logging
@@ -151,6 +153,14 @@ def test_mangle_docstring_validation_warnings(
         assert w not in warnings
 
 
+def test_update_config_invalid_validation_set():
+    app = MockApp()
+    # Results in {'a', 'l'} instead of {"all"}
+    app.config.numpydoc_validation_checks = set("all")
+    with pytest.raises(ValueError, match="Unrecognized validation code"):
+        update_config(app)
+
+
 if __name__ == "__main__":
     import pytest
     pytest.main()