code: def testFanInConcat(self, input_shapes, axis):
      init_fun, apply_fun = stax.FanInConcat(axis)
      _CheckShapeAgreement(self, init_fun, apply_fun, input_shapes)
  
imports: from absl.testing import absltest
  import numpy
  from jax._src import test_util
  from jax import random
  from jax.example_libraries import stax
  from jax import dtypes
  from jax import config
label_desc: Use image node_id 13 for calling the StaxTest obj's underlying member method code with example usage: obj.testFanInConcat(input_shapes, axis) without return types