Tests: Add failing tests for LaTeX

tomspur · QuLogic · commit 9721cb7a3280 · 2018-01-06T03:50:02.000-05:00
diff --git a/lib/matplotlib/tests/test_backend_pdf.py b/lib/matplotlib/tests/test_backend_pdf.py
@@ -218,3 +218,15 @@ def test_pdf_savefig_when_color_is_none(tmpdir):
     fig.savefig(str(expected_image), format='eps')
     result = compare_images(str(actual_image), str(expected_image), 0)
     assert result is None
+
+
+def test_failing_latex(tmpdir):
+    """Test failing latex subprocess call"""
+    path = tmpdir.join("tmpoutput.pdf")
+
+    rcParams['text.usetex'] = True
+
+    # This failes with "Double subscript"
+    plt.xlabel("$%f_2_2$" % np.random.random())
+    with pytest.raises(RuntimeError) as excinfo:
+        plt.savefig(path)
diff --git a/lib/matplotlib/tests/test_backend_ps.py b/lib/matplotlib/tests/test_backend_ps.py
@@ -11,7 +11,7 @@
 
 import matplotlib
 import matplotlib.pyplot as plt
-from matplotlib import patheffects
+from matplotlib import patheffects, rcParams
 from matplotlib.testing.decorators import image_comparison
 from matplotlib.testing.determinism import (_determinism_source_date_epoch,
                                             _determinism_check)
@@ -157,3 +157,16 @@ def test_transparency():
     ax.set_axis_off()
     ax.plot([0, 1], color="r", alpha=0)
     ax.text(.5, .5, "foo", color="r", alpha=0)
+
+
+@needs_usetex
+def test_failing_latex(tmpdir):
+    """Test failing latex subprocess call"""
+    path = tmpdir.join("tmpoutput.ps")
+
+    rcParams['text.usetex'] = True
+
+    # This failes with "Double subscript"
+    plt.xlabel("$%f_2_2$" % np.random.random())
+    with pytest.raises(RuntimeError) as excinfo:
+        plt.savefig(path)
