/usr/share/pyshared/matplotlib/tests/ is in python-matplotlib 1.1.1~rc1+git20120423-0ubuntu1.
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..
/usr/share/pyshared/matplotlib/tests/__init__.py
/usr/share/pyshared/matplotlib/tests/test_agg.py
/usr/share/pyshared/matplotlib/tests/test_axes.py
/usr/share/pyshared/matplotlib/tests/test_backend_pdf.py
/usr/share/pyshared/matplotlib/tests/test_backend_svg.py
/usr/share/pyshared/matplotlib/tests/test_basic.py
/usr/share/pyshared/matplotlib/tests/test_cbook.py
/usr/share/pyshared/matplotlib/tests/test_dates.py
/usr/share/pyshared/matplotlib/tests/test_delaunay.py
/usr/share/pyshared/matplotlib/tests/test_dviread.py
/usr/share/pyshared/matplotlib/tests/test_figure.py
/usr/share/pyshared/matplotlib/tests/test_image.py
/usr/share/pyshared/matplotlib/tests/test_legend.py
/usr/share/pyshared/matplotlib/tests/test_mathtext.py
/usr/share/pyshared/matplotlib/tests/test_mlab.py
/usr/share/pyshared/matplotlib/tests/test_png.py
/usr/share/pyshared/matplotlib/tests/test_simplification.py
/usr/share/pyshared/matplotlib/tests/test_spines.py
/usr/share/pyshared/matplotlib/tests/test_text.py
/usr/share/pyshared/matplotlib/tests/test_tightlayout.py
/usr/share/pyshared/matplotlib/tests/test_transforms.py