import textwrap


def two_sets_fake_fs(fake_fs):
    """Return fake file system setup with files with an FAI file"""
    # Create fake bedtools intersect -wao output
    fcontents = textwrap.dedent(
        """
    A\tlabel
    B\tlabel
    A\tB\tlabel
    """
    ).lstrip()

    fake_fs.fs.create_file("/work/set.txt", create_missing_dirs=True, contents=fcontents)
    return fake_fs