update tests to unittest2 (or unittest py2.7)

surf/test/test_polymesh.py

@@ -0,0 +1,27 @@
+import json
+import os
+import unittest
+
+from surf.geometry import PolygonMesh
+
+
+class TestPM(unittest.TestCase):
+
+    def setUp(self):
+        path, file_name = os.path.split(__file__)
+        self.samples_dir = os.path.join(path, os.pardir, os.pardir,
+                'blender', 'samples')
+        cube_file_name = os.path.join(self.samples_dir, 'cube.json')
+        with open(cube_file_name) as cube_file:
+            self.cube = json.load(cube_file)
+
+    def test_cube_load(self):
+        p = PolygonMesh(**self.cube)
+        v = p.vertices[0]
+        self.assertAlmostEqual(v.x, -1.0)
+        self.assertAlmostEqual(v.y, -1.0)
+        self.assertAlmostEqual(v.z, -1.0)
+
+
+if __name__ == '__main__':
+    unittest.main(verbosity=3)