code: def test_flatten_1d(self):
      mod = reshape.Flatten()
      x = jnp.zeros([10])
      y = mod(x)
      self.assertEqual(x.shape, y.shape)
  
imports: import unittest
  from absl.testing import absltest
  from absl.testing import parameterized
  from haiku._src import reshape
  from haiku._src import test_utils
  from haiku._src import transform
  import jax
  from jax.experimental import jax2tf
  import jax.numpy
  import numpy
label_desc: Use image node_id 6 for calling the ReshapeTest obj's underlying member method code with example usage: obj.test_flatten_1d() without return types