TST: Added object array and NaT tests, moved to test_indexing (pandas-dev#35498)

Author: alexhlim

pandas/tests/indexes/test_base.py

@@ -2614,22 +2614,3 @@ def construct(dtype):
         no_matches = np.array([-1] * 6, dtype=np.intp)
         tm.assert_numpy_array_equal(result[0], no_matches)
         tm.assert_numpy_array_equal(result[1], no_matches)
-
-
-@pytest.mark.parametrize(
-    "idx, target, expected",
-    [
-        ([np.nan, "var1", np.nan], [np.nan], np.array([0, 2], dtype=np.int64)),
-        (
-            [np.nan, "var1", np.nan],
-            [np.nan, "var1"],
-            np.array([0, 2, 1], dtype=np.int64),
-        ),
-    ],
-)
-def test_get_indexer_non_unique_multiple_nans(idx, target, expected):
-    # GH 35392
-    axis = pd.Index(idx)
-    actual = axis.get_indexer_for(target)
-
-    tm.assert_numpy_array_equal(actual, expected)

pandas/tests/indexes/test_indexing.py

@@ -7,6 +7,7 @@
     take
     where
     get_indexer
+    get_indexer_for
     slice_locs
     asof_locs
 
@@ -16,7 +17,9 @@
 import numpy as np
 import pytest
 
-from pandas import Float64Index, Index, Int64Index, UInt64Index
+from pandas._libs.tslibs import NaT
+
+from pandas import DatetimeIndex, Float64Index, Index, Int64Index, UInt64Index
 import pandas._testing as tm
 
 
@@ -96,3 +99,31 @@ def test_getitem_deprecated_float(idx):
 
     expected = idx[1]
     assert result == expected
+
+
+@pytest.mark.parametrize(
+    "idx, target, expected",
+    [
+        ([np.nan, "var1", np.nan], [np.nan], np.array([0, 2], dtype=np.int64)),
+        (
+            [np.nan, "var1", np.nan],
+            [np.nan, "var1"],
+            np.array([0, 2, 1], dtype=np.int64),
+        ),
+        (
+            np.array([np.nan, "var1", np.nan], dtype=np.object),
+            [np.nan],
+            np.array([0, 2], dtype=np.int64),
+        ),
+        (
+            DatetimeIndex(["2020-08-05", NaT, NaT]),
+            [NaT],
+            np.array([1, 2], dtype=np.int64),
+        ),
+    ],
+)
+def test_get_indexer_non_unique_multiple_nans(idx, target, expected):
+    # GH 35392
+    axis = Index(idx)
+    actual = axis.get_indexer_for(target)
+    tm.assert_numpy_array_equal(actual, expected)