TST: Include histogram in xlabel/ylabel test.

Author: stefmolin

pandas/tests/plotting/test_series.py

@@ -807,7 +807,7 @@ def test_style_single_ok(self):
         "index_name, old_label, new_label",
         [(None, "", "new"), ("old", "old", "new"), (None, "", "")],
     )
-    @pytest.mark.parametrize("kind", ["line", "area", "bar", "barh"])
+    @pytest.mark.parametrize("kind", ["line", "area", "bar", "barh", "hist"])
     def test_xlabel_ylabel_series(self, kind, index_name, old_label, new_label):
         # GH 9093
         ser = Series([1, 2, 3, 4])
@@ -818,6 +818,9 @@ def test_xlabel_ylabel_series(self, kind, index_name, old_label, new_label):
         if kind == "barh":
             assert ax.get_xlabel() == ""
             assert ax.get_ylabel() == old_label
+        elif kind == "hist":
+            assert ax.get_xlabel() == ""
+            assert ax.get_ylabel() == "Frequency"
         else:
             assert ax.get_ylabel() == ""
             assert ax.get_xlabel() == old_label