Suppress a warning in the test suite.

anntzer · anntzer · commit 13f641c03b6a · 2019-01-17T22:12:16.000+01:00
Namely

    lib/matplotlib/tests/test_axes.py::test_step_linestyle[png]
      &lt;venv&gt;/lib/python3.7/site-packages/_pytest/python.py:165: RuntimeWarning: Second argument 'y' is ambiguous: could be a color spec but is in data; using as data.  Either rename the entry in data or use three arguments to plot.
        testfunction(**testargs)
      &lt;venv&gt;/lib/python3.7/site-packages/_pytest/python.py:165: RuntimeWarning: Second argument 'y1' is ambiguous: could be a color spec but is in data; using as data.  Either rename the entry in data or use three arguments to plot.
        testfunction(**testargs)
      &lt;venv&gt;/lib/python3.7/site-packages/_pytest/python.py:165: RuntimeWarning: Second argument 'y2' is ambiguous: could be a color spec but is in data; using as data.  Either rename the entry in data or use three arguments to plot.
        testfunction(**testargs)
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
@@ -3642,14 +3642,14 @@ def test_step_linestyle():
         ax.set_ylim([-1, 7])
 
     # Reuse testcase from above for a labeled data test
-    data = {"x": x, "y": y, "y1": y+1, "y2": y+2}
+    data = {"X": x, "Y0": y, "Y1": y+1, "Y2": y+2}
     fig, ax_lst = plt.subplots(2, 2)
     ax_lst = ax_lst.flatten()
     ln_styles = ['-', '--', '-.', ':']
     for ax, ls in zip(ax_lst, ln_styles):
-        ax.step("x", "y", lw=5, linestyle=ls, where='pre', data=data)
-        ax.step("x", "y1", lw=5, linestyle=ls, where='mid', data=data)
-        ax.step("x", "y2", lw=5, linestyle=ls, where='post', data=data)
+        ax.step("X", "Y0", lw=5, linestyle=ls, where='pre', data=data)
+        ax.step("X", "Y1", lw=5, linestyle=ls, where='mid', data=data)
+        ax.step("X", "Y2", lw=5, linestyle=ls, where='post', data=data)
         ax.set_xlim([-1, 5])
         ax.set_ylim([-1, 7])
 
