TST(string dtype): Fix xfails in test_block_internals.py (#60765)

(cherry picked from commit d38706a)

Author: WillAyd

pandas/tests/frame/conftest.py

@@ -33,7 +33,7 @@ def float_string_frame():
     df = DataFrame(
         np.random.default_rng(2).standard_normal((30, 4)),
         index=Index([f"foo_{i}" for i in range(30)], dtype=object),
-        columns=Index(list("ABCD"), dtype=object),
+        columns=Index(list("ABCD")),
     )
     df["foo"] = "bar"
     return df

pandas/tests/frame/constructors/test_from_dict.py

@@ -108,7 +108,6 @@ def test_constructor_list_of_series(self):
         expected = DataFrame.from_dict(sdict, orient="index")
         tm.assert_frame_equal(result, expected)
 
-    @pytest.mark.xfail(using_string_dtype(), reason="columns inferring logic broken")
     def test_constructor_orient(self, float_string_frame):
         data_dict = float_string_frame.T._series
         recons = DataFrame.from_dict(data_dict, orient="index")

pandas/tests/frame/test_block_internals.py

@@ -7,8 +7,6 @@
 import numpy as np
 import pytest
 
-from pandas._config import using_string_dtype
-
 from pandas.errors import PerformanceWarning
 import pandas.util._test_decorators as td
 
@@ -185,21 +183,7 @@ def test_constructor_with_convert(self):
         )
         tm.assert_series_equal(result, expected)
 
-    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)")
     def test_construction_with_mixed(self, float_string_frame, using_infer_string):
-        # test construction edge cases with mixed types
-
-        # f7u12, this does not work without extensive workaround
-        data = [
-            [datetime(2001, 1, 5), np.nan, datetime(2001, 1, 2)],
-            [datetime(2000, 1, 2), datetime(2000, 1, 3), datetime(2000, 1, 1)],
-        ]
-        df = DataFrame(data)
-
-        # check dtypes
-        result = df.dtypes
-        expected = Series({"datetime64[us]": 3})
-
         # mixed-type frames
         float_string_frame["datetime"] = datetime.now()
         float_string_frame["timedelta"] = timedelta(days=1, seconds=1)
@@ -219,13 +203,11 @@ def test_construction_with_mixed(self, float_string_frame, using_infer_string):
         )
         tm.assert_series_equal(result, expected)
 
-    @pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)")
     def test_construction_with_conversions(self):
         # convert from a numpy array of non-ns timedelta64; as of 2.0 this does
         #  *not* convert
         arr = np.array([1, 2, 3], dtype="timedelta64[s]")
-        df = DataFrame(index=range(3))
-        df["A"] = arr
+        df = DataFrame({"A": arr})
         expected = DataFrame(
             {"A": pd.timedelta_range("00:00:01", periods=3, freq="s")}, index=range(3)
         )
@@ -243,11 +225,11 @@ def test_construction_with_conversions(self):
         assert expected.dtypes["dt1"] == "M8[s]"
         assert expected.dtypes["dt2"] == "M8[s]"
 
-        df = DataFrame(index=range(3))
-        df["dt1"] = np.datetime64("2013-01-01")
-        df["dt2"] = np.array(
+        dt1 = np.datetime64("2013-01-01")
+        dt2 = np.array(
             ["2013-01-01", "2013-01-02", "2013-01-03"], dtype="datetime64[D]"
         )
+        df = DataFrame({"dt1": dt1, "dt2": dt2})
 
         # df['dt3'] = np.array(['2013-01-01 00:00:01','2013-01-01
         # 00:00:02','2013-01-01 00:00:03'],dtype='datetime64[s]')
@@ -440,14 +422,17 @@ def test_update_inplace_sets_valid_block_values(using_copy_on_write):
         assert df.isnull().sum().sum() == 0
 
 
-@pytest.mark.xfail(using_string_dtype(), reason="TODO(infer_string)")
 def test_nonconsolidated_item_cache_take():
     # https://github.com/pandas-dev/pandas/issues/35521
 
     # create non-consolidated dataframe with object dtype columns
-    df = DataFrame()
-    df["col1"] = Series(["a"], dtype=object)
+    df = DataFrame(
+        {
+            "col1": Series(["a"], dtype=object),
+        }
+    )
     df["col2"] = Series([0], dtype=object)
+    assert not df._mgr.is_consolidated()
 
     # access column (item cache)
     df["col1"] == "A"