Fix DatetimeArray-case in test_datetime64tz_aware; create TODO

pandas/tests/test_algos.py

@@ -37,9 +37,12 @@ def assert_series_or_index_or_array_or_categorical_equal(left, right):
         tm.assert_numpy_array_equal(left, right)
     elif isinstance(left, Categorical):
         tm.assert_categorical_equal(left, right)
+    elif isinstance(left, DatetimeArray):
+        tm.assert_extension_array_equal(left, right)
     else:
         # will fail
-        assert isinstance(left, (Series, Index, np.ndarray, Categorical))
+        assert isinstance(left, (Series, Index, np.ndarray,
+                                 Categorical, DatetimeArray))
 
 
 class TestMatch(object):
@@ -493,19 +496,19 @@ def test_datetime64tz_aware(self, method, box):
         result = method(obj)
         assert_series_or_index_or_array_or_categorical_equal(result, expected)
 
-        if method == pd.unique:
-            # [Series/Index].unique do not yet support return_inverse=True
-
-            # reuse result as expected outcome of return_inverse case
-            expected_uniques = result.copy()
-            result_uniques, result_inverse = method(obj, return_inverse=True)
-
-            assert_series_or_index_or_array_or_categorical_equal(
-                result_uniques, expected_uniques)
-
-            # reconstruction can only work if inverse is correct
-            reconstr = box(result_uniques[result_inverse])
-            assert_series_or_index_or_array_or_categorical_equal(reconstr, obj)
+        # TODO: add support for return_inverse to DatetimeArray/DatetimeIndex,
+        # as well as [[Series/Index].unique
+
+        # # reuse result as expected outcome of return_inverse case
+        # expected_uniques = result.copy()
+        # result_uniques, result_inverse = method(obj, return_inverse=True)
+        #
+        # assert_series_or_index_or_array_or_categorical_equal(
+        #     result_uniques, expected_uniques)
+        #
+        # # reconstruction can only work if inverse is correct
+        # reconstr = box(result_uniques[result_inverse])
+        # assert_series_or_index_or_array_or_categorical_equal(reconstr, obj)
 
     def test_order_of_appearance(self):
         # 9346