test internal warning raises

Author: mroeschke

ci/run_tests.sh

@@ -24,7 +24,7 @@ if [[ $(uname) == "Linux" && -z $DISPLAY ]]; then
     XVFB="xvfb-run "
 fi
 
-PYTEST_CMD="${XVFB}pytest -r fEs -n $PYTEST_WORKERS --dist=loadfile $TEST_ARGS $COVERAGE $PYTEST_TARGET"
+PYTEST_CMD="${XVFB}pytest -r fEs -n $PYTEST_WORKERS --dist=loadfile $TEST_ARGS $COVERAGE pandas/tests/test_common.py"
 
 if [[ "$PATTERN" ]]; then
   PYTEST_CMD="$PYTEST_CMD -m \"$PATTERN\""

pandas/core/common.py

@@ -380,6 +380,9 @@ def standardize_mapping(into):
     DataFrame.to_dict
     Series.to_dict
     """
+    import warnings
+
+    warnings.warn("Should raise", UserWarning)
     if not inspect.isclass(into):
         if isinstance(into, defaultdict):
             return partial(defaultdict, into.default_factory)