'The C{_formatRoot} method formats a long byte string using the
built-in repr with an ellipsis.'

def test_formatRootLongByteString(self):

    e = self.makeFlattenerError()
    longString = ('abcde-' * 20)
    self.assertEqual(e._formatRoot(longString), repr('abcde-abcde-abcde-ab<...>e-abcde-abcde-abcde-'))
