def METHOD_NAME(self, bash):
    r"""Regression tests for unprocessed escape sequences after quotes
    Ref [1] https://github.com/scop/bash-completion/pull/492#discussion_r637213822
    Ref [2] https://github.com/scop/bash-completion/pull/526
    The escape sequences in the local variable of "value" in
    "_comp_quote_compgen" needs to be unescaped by passing it to printf as
    the format string.  This causes a problem in the following case [where
    the spaces after "alpha\" is a TAB character inserted in the command
    string by "C-v TAB"]:
      $ echo alpha\   b[TAB]
    """
    os.mkdir("./alpha\tbeta")
    assert (
        assert_complete(
            # Remark on "rendered_cmd": Bash aligns the last character 'b'
            # in the rendered cmd to an "8 x n" boundary using spaces.
            # Here, the command string is assumed to start from column 2
            # because the width of PS1 (conftest.PS1 = '/@') is 2,
            bash,
            "echo alpha\\\026\tb",
            rendered_cmd="echo alpha\\   b",
        )
        == "eta/"
    )