Add test that legend doesn't warn with TeX enabled.

QuLogic · QuLogic · commit bb0786b1eaca · 2020-08-27T01:01:49.000-04:00
diff --git a/lib/matplotlib/tests/test_legend.py b/lib/matplotlib/tests/test_legend.py
@@ -637,6 +637,22 @@ def test_alpha_handles():
     assert lh.get_edgecolor()[:-1] == hh[1].get_edgecolor()[:-1]
 
 
+@pytest.mark.skipif(
+    not mpl.checkdep_usetex(True),
+    reason="This test needs a TeX installation")
+def test_usetex_no_warn(caplog):
+    mpl.rcParams['font.family'] = 'serif'
+    mpl.rcParams['font.serif'] = 'Computer Modern'
+    mpl.rcParams['text.usetex'] = True
+
+    fig, ax = plt.subplots()
+    ax.plot(0, 0, label='input')
+    ax.legend(title="My legend")
+
+    fig.canvas.draw()
+    assert "Font family ['serif'] not found." not in caplog.text
+
+
 def test_warn_big_data_best_loc():
     fig, ax = plt.subplots()
     fig.canvas.draw()  # So that we can call draw_artist later.
