code: def test_applies_activation_with_dropout(self, use_dropout):
      if use_dropout:
          dropout_rate = 0.5
          rng = jax.random.PRNGKey(42)
      else:
          dropout_rate = rng = None
  
      activation = CountingActivation()
      mod = mlp.MLP([1, 1, 1], activation=activation)
      mod(jnp.ones([1, 1]), dropout_rate, rng)
      self.assertEqual(activation.count, 2)
  
imports: from absl.testing import absltest
  from absl.testing import parameterized
  from haiku._src import test_utils
  from haiku._src.nets import mlp
  import jax
  import jax.numpy
label_desc: Use image node_id 21 for calling the MLPTest obj's underlying member method code with example usage: obj.test_applies_activation_with_dropout(use_dropout) without return types