text: from nose.tools import assert_equal, assert_true, assert_false
  from spout.utils import TruePredicate, FalsePredicate, NullOperation, PassThroughFunction
  
  class TestUtils:
  
      def test_true_predicate(self):
          p = TruePredicate()
          assert_true(p.test('anything'))
  
      def test_false_predicate(self):
          p = FalsePredicate()
          assert_false(p.test('anything'))
  
      def test_pass_through_function(self):
          f = PassThroughFunction()
          assert_equal(f.apply('anything'), 'anything')
  