def METHOD_NAME(self) -> None:
    """
    L{text.isMultiline} returns C{True} if the string has a newline in it.
    """
    s = 'This code\n "breaks."'
    m = text.isMultiline(s)
    self.assertTrue(m)
    s = 'This code does not "break."'
    m = text.isMultiline(s)
    self.assertFalse(m)