def METHOD_NAME(self, bash):
    """Index shouldn't drop below 0"""
    bash.send("scp ääää§ se\t\r\n")
    got = bash.expect_exact(
        [
            "index: substring expression < 0",
            PS1,
            pexpect.EOF,
            pexpect.TIMEOUT,
        ]
    )
    assert got == 1