Add test to check invalid limits ignored on log scale

dstansby · dstansby · commit 625283f7e0d2 · 2018-04-04T12:39:24.000+01:00
diff --git a/lib/matplotlib/tests/test_scale.py b/lib/matplotlib/tests/test_scale.py
@@ -121,3 +121,21 @@ def test_logscale_nonpos_values():
 
     ax4.set_yscale('log')
     ax4.set_xscale('log')
+
+
+def test_invalid_log_lims():
+    # Check that invalid log scale limits are ignored
+    fig, ax = plt.subplots()
+    ax.scatter(range(0, 4), range(0, 4))
+
+    ax.set_xscale('log')
+    original_xlim = ax.get_xlim()
+    with pytest.warns(UserWarning):
+        ax.set_xlim(left=0)
+    assert ax.get_xlim() == original_xlim
+
+    ax.set_yscale('log')
+    original_ylim = ax.get_ylim()
+    with pytest.warns(UserWarning):
+        ax.set_ylim(bottom=0)
+    assert ax.get_ylim() == original_ylim
