Added message to pytest raises for test_constructor_dict (#32236)

Author: Dom-L-G

pandas/tests/frame/test_constructors.py

@@ -316,7 +316,8 @@ def test_constructor_dict(self):
 
         # mix dict and array, wrong size - no spec for which error should raise
         # first
-        with pytest.raises(ValueError):
+        msg = "Mixing dicts with non-Series may lead to ambiguous ordering."
+        with pytest.raises(ValueError, match=msg):
             DataFrame({"A": {"a": "a", "b": "b"}, "B": ["a", "b", "c"]})
 
         # Length-one dict micro-optimization