Don't fail tests on harmless changes to dependencies

Don't assert that matplotlib rejects shorthand hex colors,
as from 3.2 it accepts them:
https://matplotlib.org/users/prev_whats_new/whats_new_3.2.0.html#digit-and-4-digit-hex-colors

Author: Rebecca N. Palmer <[email protected]>
Forwarded: accepted pandas-dev/pandas#33262


Gbp-Pq: Name matplotlib32_compat.patch

Author: Debian Science Team

pandas/tests/plotting/test_frame.py

@@ -2036,12 +2036,6 @@ def test_line_colors(self):
         self._check_colors(ax.get_lines(), linecolors=custom_colors)
         tm.close()
 
-        with pytest.raises(ValueError):
-            # Color contains shorthand hex value results in ValueError
-            custom_colors = ["#F00", "#00F", "#FF0", "#000", "#FFF"]
-            # Forced show plot
-            _check_plot_works(df.plot, color=custom_colors)
-
     @pytest.mark.slow
     def test_dont_modify_colors(self):
         colors = ["r", "g", "b"]
@@ -2093,14 +2087,6 @@ def test_line_colors_and_styles_subplots(self):
             self._check_colors(ax.get_lines(), linecolors=[c])
         tm.close()
 
-        with pytest.raises(ValueError):
-            # Color contains shorthand hex value results in ValueError
-            custom_colors = ["#F00", "#00F", "#FF0", "#000", "#FFF"]
-            # Forced show plot
-            # _check_plot_works adds an ax so catch warning. see GH #13188
-            with tm.assert_produces_warning(UserWarning):
-                _check_plot_works(df.plot, color=custom_colors, subplots=True)
-
         rgba_colors = [cm.jet(n) for n in np.linspace(0, 1, len(df))]
         for cmap in ["jet", cm.jet]:
             axes = df.plot(colormap=cmap, subplots=True)