TST: Ensure dtypes are set correctly for empty integer columns pandas-dev#24386

Author: avinashpancham

pandas/tests/dtypes/test_dtypes.py

@@ -991,3 +991,7 @@ def test_is_dtype_no_warning(check):
 
     with tm.assert_produces_warning(None):
         check(data["A"])
+
+def test_check_dtype_empty_column():
+    data = pd.DataFrame({"a": [1, 2]}, columns=['b'], dtype=int)
+    assert data.b.dtype is np.dtype('int')