matplotlib
diff --git a/‎lib/matplotlib/tests/test_ticker.py
Copy file name to clipboardExpand all lines: lib/matplotlib/tests/test_ticker.py
+19Lines changed: 19 additions & 0 deletions b/‎lib/matplotlib/tests/test_ticker.py
Copy file name to clipboardExpand all lines: lib/matplotlib/tests/test_ticker.py
+19Lines changed: 19 additions & 0 deletions
@@ -1,6 +1,7 @@
 from contextlib import nullcontext
 import itertools
 import locale
+import logging
 import re
 
 import numpy as np
@@ -725,6 +726,24 @@ def test_mathtext_ticks(self):
             ax.set_xticks([-1, 0, 1])
             fig.canvas.draw()
 
+    def test_cmr10_substitutions(self, caplog):
+        mpl.rcParams.update({
+            'font.family': 'cmr10',
+            'mathtext.fontset': 'cm',
+            'axes.formatter.use_mathtext': True,
+        })
+
+        # Test that it does not log a warning about missing glyphs.
+        with caplog.at_level(logging.WARNING, logger='matplotlib.mathtext'):
+            fig, ax = plt.subplots()
+            ax.plot([-0.03, 0.05], [40, 0.05])
+            ax.set_yscale('log')
+            yticks = [0.02, 0.3, 4, 50]
+            formatter = mticker.LogFormatterSciNotation()
+            ax.set_yticks(yticks, map(formatter, yticks))
+            fig.canvas.draw()
+            assert not caplog.text
+
     def test_empty_locs(self):
         sf = mticker.ScalarFormatter()
         sf.set_locs([])