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Add tests for the external process calls #8504

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Add tests for the external process calls #8504

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12 changes: 12 additions & 0 deletions lib/matplotlib/tests/test_backend_pdf.py
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Original file line number Diff line number Diff line change
Expand Up @@ -208,3 +208,15 @@ 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)
15 changes: 14 additions & 1 deletion lib/matplotlib/tests/test_backend_ps.py
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Expand Up @@ -12,7 +12,7 @@

import matplotlib
import matplotlib.pyplot as plt
from matplotlib import patheffects
from matplotlib import patheffects, rcParams
from matplotlib.testing.determinism import (_determinism_source_date_epoch,
_determinism_check)

Expand Down Expand Up @@ -174,3 +174,16 @@ def test_determinism_all():
def test_determinism_all_tex():
"""Test for reproducible PS/tex output"""
_determinism_check(format="ps", usetex=True)


@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)