code: def test_nested(self):
      assert_json_serializable({"a": [1]})
      assert_json_serializable({"a": {"b": 1}})
      assert_json_serializable({"a": [{"b": 1}]})
      assert_json_serializable({"a": [{"b": 1}, {"c": 2}]})
  
imports: from graphistry.utils.json import assert_json_serializable
label_desc: Use image node_id 4 for calling the TestAssertJsonSerializable obj's underlying member method code with example usage: obj.test_nested() without return types