TST: non-pyarrow build

Author: jbrockmendel

pandas/tests/groupby/transform/test_transform.py

@@ -6,6 +6,7 @@
 from pandas._config import using_string_dtype
 
 from pandas._libs import lib
+from pandas.compat import HAS_PYARROW
 
 from pandas.core.dtypes.common import ensure_platform_int
 
@@ -384,7 +385,10 @@ def test_transform_nuisance_raises(df, using_infer_string):
     gbc = grouped["B"]
     msg = "Could not convert"
     if using_infer_string:
-        msg = "with dtype str does not support operation 'mean'"
+        if df.columns.dtype.storage == "pyarrow":
+            msg = "with dtype str does not support operation 'mean'"
+        else:
+            msg = "Cannot perform reduction 'mean' with string dtype"
     with pytest.raises(TypeError, match=msg):
         gbc.transform(lambda x: np.mean(x))
 
@@ -479,7 +483,10 @@ def test_groupby_transform_with_int(using_infer_string):
     )
     msg = "Could not convert"
     if using_infer_string:
-        msg = "with dtype str does not support operation 'mean'"
+        if HAS_PYARROW:
+            msg = "with dtype str does not support operation 'mean'"
+        else:
+            msg = "Cannot perform reduction 'mean' with string dtype"
     with np.errstate(all="ignore"):
         with pytest.raises(TypeError, match=msg):
             df.groupby("A").transform(lambda x: (x - x.mean()) / x.std())