Test that text is located correctly with xcolor.

QuLogic · QuLogic · commit dc9b72129fd8 · 2021-02-16T17:34:03.000-05:00
diff --git a/lib/matplotlib/testing/__init__.py b/lib/matplotlib/testing/__init__.py
@@ -44,3 +44,7 @@ def setup():
     # are not necessarily the default values as specified in rcsetup.py.
     set_font_settings_for_testing()
     set_reproducibility_for_testing()
+
+
+def _has_tex_package(package):
+    return bool(mpl.dviread.find_tex_file(f"{package}.sty"))
diff --git a/lib/matplotlib/tests/test_backend_pgf.py b/lib/matplotlib/tests/test_backend_pgf.py
@@ -11,6 +11,7 @@
 
 import matplotlib as mpl
 import matplotlib.pyplot as plt
+from matplotlib.testing import _has_tex_package
 from matplotlib.testing.compare import compare_images, ImageComparisonFailure
 from matplotlib.backends.backend_pgf import PdfPages, common_texification
 from matplotlib.testing.decorators import (_image_directories,
@@ -51,10 +52,6 @@ def check_for(texsystem):
     reason="This test needs a ghostscript installation")
 
 
-def _has_tex_package(package):
-    return bool(mpl.dviread.find_tex_file(f"{package}.sty"))
-
-
 def compare_figure(fname, savefig_kwargs={}, tol=0):
     actual = os.path.join(result_dir, fname)
     plt.savefig(actual, **savefig_kwargs)
diff --git a/lib/matplotlib/tests/test_usetex.py b/lib/matplotlib/tests/test_usetex.py
@@ -2,6 +2,7 @@
 import pytest
 
 import matplotlib as mpl
+from matplotlib.testing import _has_tex_package
 from matplotlib.testing.decorators import check_figures_equal, image_comparison
 import matplotlib.pyplot as plt
 
@@ -80,6 +81,23 @@ def test_minus_no_descent(fontsize):
     assert len({*heights.values()}) == 1
 
 
+@pytest.mark.skipif(not _has_tex_package('xcolor'),
+                    reason='xcolor is not available')
+def test_usetex_xcolor():
+    mpl.rcParams['text.usetex'] = True
+
+    fig = plt.figure()
+    t = fig.text(0.5, 0.5, "Some text 0123456789")
+    fig.canvas.draw()
+    pos = t.get_window_extent()
+
+    mpl.rcParams['text.latex.preamble'] = r'\usepackage[dvipsnames]{xcolor}'
+    fig = plt.figure()
+    t = fig.text(0.5, 0.5, "Some text 0123456789")
+    fig.canvas.draw()
+    np.testing.assert_array_equal(t.get_window_extent(), pos)
+
+
 def test_textcomp_full():
     plt.rcParams["text.latex.preamble"] = r"\usepackage[full]{textcomp}"
     fig = plt.figure()
