code: def testAssociativity(self):
      with DtypeConversionTestEnv("all"):
          for v1 in _ALL_INPUT_TYPES:
              for v2 in _ALL_INPUT_TYPES:
                  for v3 in _ALL_INPUT_TYPES:
                      all_res = [
                          flexible_dtypes.result_type(v1, v2, v3),
                          flexible_dtypes.result_type(v1, v3, v2),
                          flexible_dtypes.result_type(v2, v1, v3),
                          flexible_dtypes.result_type(v2, v3, v1),
                          flexible_dtypes.result_type(v3, v1, v2),
                          flexible_dtypes.result_type(v3, v2, v1),
                      ]
                      self.assertAllEqual(all_res[:-1], all_res[1:])
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import extension_type
  from tensorflow.python.framework import flexible_dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor
  from tensorflow.python.framework import weak_tensor
  from tensorflow.python.ops import variables
  from tensorflow.python.ops import weak_tensor_test_util
  from tensorflow.python.platform import test
label_desc: Use image node_id 22 for calling the DtypesUtilTest obj's underlying member method code with example usage: obj.testAssociativity() without return types