xfail tests triggering empty concat warning

Author: jorisvandenbossche

pandas/tests/reshape/concat/test_empty.py

@@ -1,6 +1,8 @@
 import numpy as np
 import pytest
 
+from pandas._config import using_string_dtype
+
 import pandas as pd
 from pandas import (
     DataFrame,
@@ -238,6 +240,8 @@ def test_concat_empty_dataframe_dtypes(self):
         assert result["b"].dtype == np.float64
         assert result["c"].dtype == np.float64
 
+    # triggers warning about empty entries
+    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)")
     def test_concat_inner_join_empty(self):
         # GH 15328
         df_empty = DataFrame()

pandas/tests/reshape/merge/test_join.py

@@ -3,6 +3,8 @@
 import numpy as np
 import pytest
 
+from pandas._config import using_string_dtype
+
 import pandas.util._test_decorators as td
 
 import pandas as pd
@@ -341,6 +343,8 @@ def test_join_index_mixed_overlap(self):
         expected = _join_by_hand(df1, df2)
         tm.assert_frame_equal(joined, expected)
 
+    # triggers warning about empty entries
+    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)")
     def test_join_empty_bug(self):
         # generated an exception in 0.4.3
         x = DataFrame()