TST: skip assert for mpl 3.1+

Author: TomAugspurger

pandas/tests/plotting/common.py

@@ -36,6 +36,7 @@ def setup_method(self, method):
 
         self.mpl_ge_2_2_3 = plotting._compat._mpl_ge_2_2_3()
         self.mpl_ge_3_0_0 = plotting._compat._mpl_ge_3_0_0()
+        self.mpl_ge_3_1_0 = plotting._compat._mpl_ge_3_1_0()
 
         self.bp_n_objects = 7
         self.polycollection_factor = 2

pandas/tests/plotting/test_frame.py

@@ -383,8 +383,10 @@ def test_subplots(self):
             for ax in axes[:-2]:
                 self._check_visible(ax.xaxis)  # xaxis must be visible for grid
                 self._check_visible(ax.get_xticklabels(), visible=False)
-                self._check_visible(
-                    ax.get_xticklabels(minor=True), visible=False)
+                if not (kind == 'bar' and self.mpl_ge_3_1_0):
+                    # change https://github.com/pandas-dev/pandas/issues/26714
+                    self._check_visible(
+                        ax.get_xticklabels(minor=True), visible=False)
                 self._check_visible(ax.xaxis.get_label(), visible=False)
                 self._check_visible(ax.get_yticklabels())