class_docstr: Test ops
code: def test_property(self):
      op = ops.my_namespace.my_operator("a", "b", c="c")
      self.assertEqual(op.name, "my-namespace/my-operator")
      self.assertEqual(op.init_args, ("a", "b"))
      self.assertEqual(op.init_kws, {"c": "c"})
      self.assertEqual(op.tag, "main")
  
      with self.assertRaises(RuntimeError):
          op.get_op()
  
file_path: towhee/tests/unittests/runtime/test_factory.py
imports: import unittest
  from towhee.runtime import ops, register
label_desc: Use image node_id 1 for calling the TestOps obj's underlying member method code with example usage: obj.test_property() without return types