Add test for mathtext operators

Author: devRD

lib/matplotlib/tests/test_mathtext.py

@@ -510,3 +510,31 @@ def test_mathtext_cmr10_minus_sign():
     ax.plot(range(-1, 1), range(-1, 1))
     # draw to make sure we have no warnings
     fig.canvas.draw()
+
+
+def test_mathtext_operators():
+    test_str = r'''
+    \increment \smallin \notsmallowns
+    \smallowns \QED \rightangle
+    \smallintclockwise \smallvarointclockwise
+    \smallointctrcclockwise
+    \ratio \minuscolon \dotsminusdots
+    \sinewave \simneqq \nlesssim
+    \ngtrsim \nlessgtr \ngtrless
+    \cupleftarrow \oequal \rightassert
+    \rightModels \hermitmatrix \barvee
+    \measuredrightangle \varlrtriangle
+    \equalparallel \npreccurlyeq \nsucccurlyeq
+    \nsqsubseteq \nsqsupseteq \sqsubsetneq
+    \sqsupsetneq  \disin \varisins
+    \isins \isindot \varisinobar
+    \isinobar \isinvb \isinE
+    \nisd \varnis \nis
+    \varniobar \niobar \bagmember
+    \triangle'''.split()
+
+    fig = plt.figure()
+    for x, i in enumerate(test_str):
+        fig.text(0.5, (x + 0.5)/len(test_str), r'${%s}$' % i)
+
+    fig.draw_without_rendering()