def METHOD_NAME(test_function):
    """Returns True if a working backend for FITS I/O is importable.
    Used to skip tests requiring fits_io. The dummy backend itself
    is not a "working backend" in the sense that it cannot be used to
    read or write files.
    """
    packages = ('astropy.io.fits',
                'pycrates',
                )
    msg = "FITS backend required"
    return requires_package(msg, *packages)(test_function)