Add inverse to test_datetime64tz_aware

pandas/tests/test_algos.py

@@ -493,6 +493,20 @@ 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)
+
  def test_order_of_appearance(self):
  # 9346
  # light testing of guarantee of order of appearance