text: import unittest
  
  from transformers import is_tf_available
  from transformers.testing_utils import require_tf
  
  
  if is_tf_available():
      from transformers.activations_tf import get_tf_activation
  
  
  @require_tf
  class TestTFActivations(unittest.TestCase):
      def test_get_activation(self):
          get_tf_activation("swish")
          get_tf_activation("silu")
          get_tf_activation("gelu")
          get_tf_activation("relu")
          get_tf_activation("tanh")
          get_tf_activation("gelu_new")
          get_tf_activation("gelu_fast")
          get_tf_activation("mish")
          with self.assertRaises(KeyError):
              get_tf_activation("bogus")
          with self.assertRaises(KeyError):
              get_tf_activation(None)
  