def testUnknownUsemtl(self):
        self.assertRaises(pywavefront.PywavefrontException,
                pywavefront.Wavefront, 'simple_unknown_usemtl.obj')
Referencing an unknown material with usemtl should raise an exception.
dataset/ETHPy150Open greenmoss/PyWavefront/test/test_wavefront.py/TestBrokenWavefront.testUnknownUsemtl