code: def test_mean(self, shape, result_shape):
      mean = jnp.vectorize(jnp.mean, signature="(n)->()")
      self.assertEqual(mean(jnp.zeros(shape)).shape, result_shape)
  
imports: from functools import partial
  from absl.testing import absltest
  import numpy
  import jax
  from jax import numpy
  from jax._src import test_util
  from jax import config
label_desc: Use image node_id 5 for calling the VectorizeTest obj's underlying member method code with example usage: obj.test_mean(shape, result_shape) without return types