code: def testLen(self):
      d1 = immutable_dict.ImmutableDict({})
      self.assertLen(d1, 0)  # pylint: disable=g-generic-assert
      d2 = immutable_dict.ImmutableDict({"x": 1, "y": 2})
      self.assertLen(d2, 2)
  
file_path: tensorflow/tensorflow/python/framework/immutable_dict_test.py
imports: from absl.testing import parameterized
  from tensorflow.python.framework import immutable_dict
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 4 for calling the ImmutableDictTest obj's underlying member method code with example usage: obj.testLen() without return types