def invalid_token_test():
    lexer = LatexIncrementalDecoder()
    # piggyback an implementation which results in invalid tokens
    lexer.get_raw_tokens = lambda bytes_, final: [Token('**invalid**', bytes_)]
    nose.tools.assert_raises(AssertionError, lambda: lexer.decode(b'hello'))
def invalid_token_test():
    lexer = LatexIncrementalDecoder()
    # piggyback an implementation which results in invalid tokens
    lexer.get_raw_tokens = lambda bytes_, final: [Token('**invalid**', bytes_)]
    nose.tools.assert_raises(AssertionError, lambda: lexer.decode(b'hello'))