__________________________________________________________________________________________ test_rcupdate __________________________________________________________________________________________

    @needs_pgf_xelatex
    @needs_pgf_pdflatex
    @mpl.style.context('default')
    @pytest.mark.backend('pgf')
    def test_rcupdate():
        rc_sets = [{'font.family': 'sans-serif',
                    'font.size': 30,
                    'figure.subplot.left': .2,
                    'lines.markersize': 10,
                    'pgf.rcfonts': False,
                    'pgf.texsystem': 'xelatex'},
                   {'font.family': 'monospace',
                    'font.size': 10,
                    'figure.subplot.left': .1,
                    'hatch.color': 'orange',
                    'hatch.linewidth': 2,
                    'lines.markersize': 20,
                    'pgf.rcfonts': False,
                    'pgf.texsystem': 'pdflatex',
                    'pgf.preamble': ('\\usepackage[utf8x]{inputenc}'
                                     '\\usepackage[T1]{fontenc}'
                                     '\\usepackage{sfmath}')}]
        tol = [0, 13.2] if _old_gs_version else [0, 0]
        for i, rc_set in enumerate(rc_sets):
            with mpl.rc_context(rc_set):
                for substring, pkg in [('sfmath', 'sfmath'), ('utf8x', 'ucs')]:
                    if (substring in mpl.rcParams['pgf.preamble']
                            and not _has_tex_package(pkg)):
                        pytest.skip(f'needs {pkg}.sty')
                create_figure()
>               compare_figure(f'pgf_rcupdate{i + 1}.pdf', tol=tol[i])

lib/matplotlib/tests/test_backend_pgf.py:167: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

fname = 'pgf_rcupdate1.pdf', savefig_kwargs = {}, tol = 0

    def compare_figure(fname, savefig_kwargs={}, tol=0):
        actual = os.path.join(result_dir, fname)
        plt.savefig(actual, **savefig_kwargs)
    
        expected = os.path.join(result_dir, "expected_%s" % fname)
        shutil.copyfile(os.path.join(baseline_dir, fname), expected)
        err = compare_images(expected, actual, tol=tol)
        if err:
>           raise ImageComparisonFailure(err)
E           matplotlib.testing.exceptions.ImageComparisonFailure: Error: Image files did not match.
E             RMS Value: 1.0027234615164846
E             Expected:  
E               /home/axelj/Documents/matplotlib/matplotlib/result_images/test_backend_pgf/expected_pgf_rcupdate1_pdf.png
E             Actual:    
E               /home/axelj/Documents/matplotlib/matplotlib/result_images/test_backend_pgf/pgf_rcupdate1_pdf.png
E             Difference:
E               /home/axelj/Documents/matplotlib/matplotlib/result_images/test_backend_pgf/pgf_rcupdate1_pdf-failed-diff.png
E             Tolerance: 
E               0

lib/matplotlib/tests/test_backend_pgf.py:37: ImageComparisonFailure