add test

Author: cmp0xff

pandas/tests/test_algos.py

@@ -1446,6 +1446,12 @@ def test_value_counts_series(self):
         )
         tm.assert_series_equal(result, expected)
 
+    def test_value_counts_stability(self):
+        # GH 63155
+        arr = np.random.default_rng(2).integers(0, 128, 8192)
+        result = algos.value_counts_internal(arr, sort=True)
+        expected = Series(arr).value_counts(sort=False).sort_values(ascending=False, kind="stable")
+        tm.assert_series_equal(result, expected)
 
 class TestDuplicated:
     def test_duplicated_with_nas(self):