Added a test for usetex+EngFormatter

pharshalp · pharshalp · commit c40a7f9063ef · 2018-11-20T17:25:36.000-05:00
diff --git a/lib/matplotlib/tests/test_usetex.py b/lib/matplotlib/tests/test_usetex.py
@@ -5,6 +5,7 @@
 import matplotlib
 from matplotlib.testing.decorators import image_comparison
 import matplotlib.pyplot as plt
+from matplotlib.ticker import EngFormatter
 
 
 with warnings.catch_warnings():
@@ -31,3 +32,18 @@ def test_usetex():
             fontsize=24)
     ax.set_xticks([])
     ax.set_yticks([])
+
+
+@needs_usetex
+def test_usetex_engformatter():
+    matplotlib.rcParams['text.usetex'] = True
+    fig, ax = plt.subplots()
+    ax.plot([0, 500, 1000], [0, 500, 1000])
+    ax.set_xticks([0, 500, 1000])
+    formatter = EngFormatter()
+    ax.xaxis.set_major_formatter(formatter)
+    fig.canvas.draw()
+    x_tick_label_text = [label.get_text() for label in ax.get_xticklabels()]
+    # Checking if the dollar `$` signs have been inserted around numbers
+    # in tick label text.
+    assert x_tick_label_text == ['$0$', '$500$', '$1$ k']
