matplotlib.tests.test_text.test_font_styles fails when DejaVuSans not installed

[jkseppan]

The test case matplotlib.tests.test_text.test_font_styles includes reference files with some text set in a light font and some text in a condensed font. On my system both examples are set in a normal font, causing the test to fail. Investigation of the reference file font_styles.pdf (uncompressing with pdftk and grepping for BaseFont) shows that the fonts included in it are

DejaVuSansCondensed
BitstreamVeraSans-Bold
BitstreamVeraSans-BoldOblique
DejaVuSans-ExtraLight
BitstreamVeraSans-Roman

To be portable, the test should only rely on fonts that are delivered with matplotlib.

[mdboom]

Agreed that this test is not portable. We can leverage the "directory" kwarg of findfont to only search within the mpl-data directory. It means the "Condensed" font is not really Condensed, but that in itself is a good test of the fallback feature of the font lookup code.

[jkseppan]

Agreed. Thanks for the fix!