Add zorder test

dstansby · dstansby · commit 31c286ba6986 · 2019-04-26T12:29:00.000+01:00
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
@@ -6329,3 +6329,18 @@ def test_hist_range_and_density():
                           range=(0, 1), density=True)
     assert bins[0] == 0
     assert bins[-1] == 1
+
+
+def test_bar_errbar_zorder():
+    # Check that the zorder of errorbars is always greater than the bar they
+    # are plotted on
+    fig, ax = plt.subplots()
+    x = [1, 2, 3]
+    barcont = ax.bar(x=x, height=x, yerr=x, capsize=5, zorder=3)
+
+    data_line, caplines, barlinecols = barcont.errorbar.lines
+    for bar in barcont.patches:
+        for capline in caplines:
+            assert capline.zorder > bar.zorder
+        for barlinecol in barlinecols:
+            assert barlinecol.zorder > bar.zorder
