TST: Add test to make sure kwargs dicts aren't mutated by subplots

jklymak · jklymak · commit 8ef7b4995403 · 2018-07-09T09:33:31.000-07:00
diff --git a/lib/matplotlib/tests/test_subplots.py b/lib/matplotlib/tests/test_subplots.py
@@ -149,3 +149,12 @@ def test_get_gridspec():
     # ahem, pretty trivial, but...
     fig, ax = plt.subplots()
     assert ax.get_subplotspec().get_gridspec() == ax.get_gridspec()
+
+
+def test_dont_mutate_kwargs():
+    subplot_kw = {'sharex': 'all'}
+    gridspec_kw = {'width_ratios': [1, 2]}
+    fig, ax = plt.subplots(1, 2, subplot_kw=subplot_kw,
+                           gridspec_kw=gridspec_kw)
+    assert subplot_kw == {'sharex': 'all'}
+    assert gridspec_kw == {'width_ratios': [1, 2]}
