Test that text is located correctly with xcolor.

Author: QuLogic

lib/matplotlib/testing/__init__.py

@@ -75,3 +75,7 @@ def check_for_pgf(texsystem):
         except (OSError, subprocess.CalledProcessError):
             return False
         return True
+
+
+def _has_tex_package(package):
+    return bool(mpl.dviread.find_tex_file(f"{package}.sty"))

lib/matplotlib/tests/test_backend_pgf.py

@@ -2,14 +2,13 @@
 from io import BytesIO
 import os
 import shutil
-import subprocess
 
 import numpy as np
 import pytest
 
 import matplotlib as mpl
 import matplotlib.pyplot as plt
-from matplotlib.testing import check_for_pgf
+from matplotlib.testing import _has_tex_package, check_for_pgf
 from matplotlib.testing.compare import compare_images, ImageComparisonFailure
 from matplotlib.backends.backend_pgf import PdfPages, common_texification
 from matplotlib.testing.decorators import (_image_directories,
@@ -29,10 +28,6 @@
     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)

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()