add a unittest for obj file without material

Author: Marxlp

test/simple_no_mtl.obj

@@ -0,0 +1,26 @@
+# Blender v2.76 (sub 0) OBJ File: ''
+# www.blender.org
+o SimpleB
+v 0.040000 0.050000 0.060000
+v 0.010000 0.020000 0.030000
+v 0.070000 0.080000 0.090000
+vt 14.000000 15.000000
+vt 12.000000 13.000000
+vt 10.000000 11.000000
+vn 0.879800 0.471100 0.063200
+vn 0.577400 0.577400 0.577400
+vn 0.894200 0.267700 -0.359000
+s 1
+f 1/1/1 2/2/2 3/3/3
+o Simple
+v 0.040000 0.050000 0.060000
+v 0.010000 0.020000 0.030000
+v 0.070000 0.080000 0.090000
+vt 14.000000 15.000000
+vt 12.000000 13.000000
+vt 10.000000 11.000000
+vn 0.879800 0.471100 0.063200
+vn 0.577400 0.577400 0.577400
+vn 0.894200 0.267700 -0.359000
+s 1
+f 4/4/4 5/5/5 6/6/6

test/test_wavefront.py

@@ -52,3 +52,20 @@ def testMissingNormals(self):
         "If there are texture coordinates but no normals, should raise an exception."
         self.assertRaises(pywavefront.PywavefrontException,
                 pywavefront.Wavefront, 'simple_missing_normals.obj')
+
+class TestNoMaterial(TestWavefront):
+    def setUp(self):
+        pyglet.resource.path.append('@' + __name__)
+        pyglet.resource.reindex()
+        # reset the obj file to new file with no mtl line
+        self.meshes = pywavefront.Wavefront('simple_no_mtl.obj')
+
+    def testMaterials(self):
+        """Override this method"""
+        pass
+
+    def testMeshMaterialVertices(self):
+        "Mesh vertices should have known values."
+        self.assertEqual(len(self.meshes.meshes['Simple'].materials[0].vertices), 48)
+
+