fix test config

Co-authored by: Aitik Gupta <[email protected]>

Author: casperdcl

lib/matplotlib/tests/test_mathtext.py

@@ -391,6 +391,7 @@ def test_mathtext_cmr10_minus_sign():
     # cmr10 does not contain a minus sign and used to issue a warning
     # RuntimeWarning: Glyph 8722 missing from current font.
     mpl.rcParams['font.family'] = 'cmr10'
+    mpl.rcParams['axes.formatter.use_mathtext'] = True
     fig, ax = plt.subplots()
     ax.plot(range(-1, 1), range(-1, 1))
     with pytest.warns(None) as record: