TST: Add test for x-axis labels in subplots with

TST: Add test for x-axis labels in subplots with

Author: Jason Mok

pandas/tests/plotting/test_series.py

@@ -958,3 +958,18 @@ def test_plot_no_warning(self, ts):
         # TODO(3.0): this can be removed once Period[B] deprecation is enforced
         with tm.assert_produces_warning(False):
             _ = ts.plot()
+
+    @pytest.mark.slow
+    def test_x_axis_labels_secondary_y(self):
+        # GH#14102
+        s1 = Series([5, 7, 6, 8, 7], index=[1, 2, 3, 4, 5])
+        s2 = Series([6, 4, 5, 3, 4], index=[1, 2, 3, 4, 5])
+
+        ax1 = plt.subplot(2, 1, 1)
+        s1.plot(ax=ax1)
+        s2.plot(ax=ax1, secondary_y=True)
+        assert len(ax1.xaxis.get_minor_ticks()) == 0
+
+        ax2 = plt.subplot(2, 1, 2)
+        s1.plot(ax=ax2)
+        assert len(ax1.xaxis.get_minor_ticks()) == 0