def METHOD_NAME():
    with open(CONFIG_FILENAME, "w") as new_file:
        new_file.write("[this]\n\tthat = foobar\n\tthat = foobeer\n")
    config = Config()
    config.add_file(CONFIG_FILENAME, 6)
    assert 'this.that' in config
    l = list(config.get_multivar('this.that'))
    assert ['foobar', 'foobeer'] == l
    l = list(config.get_multivar('this.that', 'bar'))
    assert ['foobar'] == l
    l = list(config.get_multivar('this.that', 'foo.*'))
    assert ['foobar', 'foobeer'] == l
    config.set_multivar('this.that', '^.*beer', 'fool')
    l = list(config.get_multivar('this.that', 'fool'))
    assert ['fool'] == l
    config.set_multivar('this.that', 'foo.*', 'foo-123456')
    l = list(config.get_multivar('this.that', 'foo.*'))
    assert ['foo-123456', 'foo-123456'] == l
    config.delete_multivar('this.that', 'bar')
    l = list(config.get_multivar('this.that', ''))
    assert ['foo-123456', 'foo-123456'] == l
    config.delete_multivar('this.that', 'foo-[0-9]+')
    l = list(config.get_multivar('this.that', ''))
    assert [] == l