Add test_take_when_index_has_negative_step

Author: GianlucaFicarelli

pandas/tests/indexes/ranges/test_indexing.py

@@ -116,6 +116,12 @@ def test_take_when_index_has_step(self):
         expected = Index([4, 1, 10, 1], dtype=np.int64, name="foo")
         tm.assert_index_equal(result, expected)
 
+    def test_take_when_index_has_negative_step(self):
+        idx = RangeIndex(11, -4, -2, name="foo")  # [11, 9, 7, 5, 3, 1, -1, -3]
+        result = idx.take(np.array([1, 0, -1, -8]))
+        expected = Index([9, 11, -3, 11], dtype=np.int64, name="foo")
+        tm.assert_index_equal(result, expected)
+
 
 class TestWhere:
     def test_where_putmask_range_cast(self):