review

Author: boeddeker

doc/source/whatsnew/v0.22.0.txt

@@ -292,7 +292,7 @@ Plotting
 ^^^^^^^^
 
 - :func: `DataFrame.plot` now raises a ``ValueError`` when the ``x`` or ``y`` argument is improperly formed (:issue:`18671`)
-- Bug in :func: `DataFrame.plot` where the ``xtickvalues`` are overwritten (:issue:`#18687`)
+- Bug in :func:`DataFrame.plot` the second call writing in the same figure where both have ``x`` values of type string overwrote the ``xticklabels`` of the first call (:issue:`18687`)
 -
 
 Groupby/Resample/Rolling

pandas/tests/plotting/test_frame.py

@@ -150,11 +150,16 @@ def test_two_plots_with_x_str(self):
         ax = df2.plot(ax=ax)
 
         line1, line2 = ax.lines
+
         # xdata should not be touched (Earlier it was [0, 1])
-        np.testing.assert_equal(line1.get_xdata(), x1)
-        np.testing.assert_equal(line1.get_ydata(), y1)
-        np.testing.assert_equal(line2.get_xdata(), x2)
-        np.testing.assert_equal(line2.get_ydata(), y2)
+        tm.assert_numpy_array_equal(line1.get_xdata(), np.array(x1),
+                                    check_dtype=False)
+        tm.assert_numpy_array_equal(line1.get_ydata(), np.array(y1),
+                                    check_dtype=False)
+        tm.assert_numpy_array_equal(line2.get_xdata(), np.array(x2),
+                                    check_dtype=False)
+        tm.assert_numpy_array_equal(line2.get_ydata(), np.array(y2),
+                                    check_dtype=False)
 
     # GH 15516
     def test_mpl2_color_cycle_str(self):