TST: Verify plot order of a Series (GH38865) (#39491)

Author: avinashpancham

pandas/tests/plotting/test_series.py

@@ -752,6 +752,25 @@ def test_plot_no_numeric_data(self):
         with pytest.raises(TypeError, match="no numeric data to plot"):
             df.plot()
 
+    @pytest.mark.parametrize(
+        "data, index",
+        [
+            ([1, 2, 3, 4], [3, 2, 1, 0]),
+            ([10, 50, 20, 30], [1910, 1920, 1980, 1950]),
+        ],
+    )
+    def test_plot_order(self, data, index):
+        # GH38865 Verify plot order of a Series
+        ser = Series(data=data, index=index)
+        ax = ser.plot(kind="bar")
+
+        expected = ser.tolist()
+        result = [
+            patch.get_bbox().ymax
+            for patch in sorted(ax.patches, key=lambda patch: patch.get_bbox().xmax)
+        ]
+        assert expected == result
+
     def test_style_single_ok(self):
         s = Series([1, 2])
         ax = s.plot(style="s", color="C3")