add unittest main

Author: petercorke

tests/test_Shape.py

@@ -115,3 +115,6 @@ def test_collision(self):
     def test_wt(self):
         s0 = rp.Box([1, 1, 1], sm.SE3(0, 0, 0))
         s0.wT = np.eye(4)
+
+if __name__ == '__main__':  # pragma nocover
+    unittest.main()