Tests: Add failing tests for LaTeX

tomspur · tomspur · commit 58d2e23f9aaa · 2017-04-26T23:32:54.000+02:00
diff --git a/lib/matplotlib/tests/test_backend_pdf.py b/lib/matplotlib/tests/test_backend_pdf.py
@@ -12,6 +12,7 @@
 import pytest
 
 import numpy as np
+import matplotlib
 from matplotlib import checkdep_tex, cm, rcParams
 from matplotlib.backends.backend_pdf import PdfPages
 from matplotlib import pyplot as plt
@@ -191,3 +192,20 @@ def psfont(*args, **kwargs):
     ax.text(0.5, 0.5, 'hello')
     with tempfile.TemporaryFile() as tmpfile, pytest.raises(ValueError):
         fig.savefig(tmpfile, format='pdf')
+
+
+@needs_tex
+def test_failing_latex(tmpdir):
+    """Test failing latex subprocess call"""
+    path = tmpdir.join("tmpoutput.pdf")
+
+    matplotlib.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)
+        output = str(excinfo.value)
+        assert "LaTeX was not able to process the following string:" \
+               in output
+        assert "Double subscript." in output
diff --git a/lib/matplotlib/tests/test_backend_ps.py b/lib/matplotlib/tests/test_backend_ps.py
@@ -188,3 +188,20 @@ def test_determinism_all():
 def test_determinism_all_tex():
     """Test for reproducible PS/tex output"""
     _determinism_check(format="ps", usetex=True)
+
+
+@needs_tex
+def test_failing_latex(tmpdir):
+    """Test failing latex subprocess call"""
+    path = tmpdir.join("tmpoutput.ps")
+
+    matplotlib.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)
+        output = str(excinfo.value)
+        assert "LaTeX was not able to process the following string:" \
+               in output
+        assert "Double subscript." in output
