text: 
  import unittest2
  
  import testlib
  import mitogen.core
  
  
  class ConstructorTest(testlib.TestCase):
      klass = mitogen.core.Error
  
      def test_literal_no_format(self):
          e = self.klass('error')
          self.assertEquals(e.args[0], 'error')
          self.assertTrue(isinstance(e.args[0], mitogen.core.UnicodeType))
  
      def test_literal_format_chars_present(self):
          e = self.klass('error%s')
          self.assertEquals(e.args[0], 'error%s')
          self.assertTrue(isinstance(e.args[0], mitogen.core.UnicodeType))
  
      def test_format(self):
          e = self.klass('error%s', 123)
          self.assertEquals(e.args[0], 'error123')
          self.assertTrue(isinstance(e.args[0], mitogen.core.UnicodeType))
  
      def test_bytes_to_unicode(self):
          e = self.klass(mitogen.core.b('error'))
          self.assertEquals(e.args[0], 'error')
          self.assertTrue(isinstance(e.args[0], mitogen.core.UnicodeType))
  
  
  if __name__ == '__main__':
      unittest2.main()
  