def METHOD_NAME(self) -> None:
    """
    Check the length of the lines.
    """
    failures = []
    for line in self.output:
        if not len(line) <= self.lineWidth:
            failures.append(len(line))
    if failures:
        self.fail(
            "%d of %d lines were too long.\n"
            "%d < %s" % (len(failures), len(self.output), self.lineWidth, failures)
        )