How to use the reprozip.common.InputOutputFile function in reprozip

def test_label_files(self):
        """Tests input/output file labelling."""
        wd = Path('/fakeworkingdir')
        self.assertEqual(
            compile_inputs_outputs(
                [{'argv': ['aa', 'bb.txt'], 'workingdir': wd}],
                [[wd / 'aa', Path('/other/cc.bin'), wd / 'bb.txt']],
                [[]]),
            {'arg0': InputOutputFile(wd / 'aa', [0], []),
             'cc.bin': InputOutputFile(Path('/other/cc.bin'), [0], []),
             'arg1': InputOutputFile(wd / 'bb.txt', [0], [])})

def test_label_files(self):
        """Tests input/output file labelling."""
        wd = Path('/fakeworkingdir')
        self.assertEqual(
            compile_inputs_outputs(
                [{'argv': ['aa', 'bb.txt'], 'workingdir': wd}],
                [[wd / 'aa', Path('/other/cc.bin'), wd / 'bb.txt']],
                [[]]),
            {'arg0': InputOutputFile(wd / 'aa', [0], []),
             'cc.bin': InputOutputFile(Path('/other/cc.bin'), [0], []),
             'arg1': InputOutputFile(wd / 'bb.txt', [0], [])})

run_nb, arg_nb = runs_with_file[fi]
                parts = []
                # Run number, if there are more than one runs
                if len(runs) > 1:
                    parts.append(run_nb)
                # Argument number, if there are more than one file arguments
                if nb_file_args[run_nb] > 1:
                    parts.append(arg_nb)
                file_names[fi] = make_unique(
                    'arg%s' % '_'.join('%s' % s for s in parts))
            else:
                file_names[fi] = make_unique('arg_%s' % fi.unicodename)
        else:
            file_names[fi] = make_unique(fi.unicodename)

    return dict((n, InputOutputFile(p, readers.get(p, []), writers.get(p, [])))
                for p, n in iteritems(file_names))

run_nb, arg_nb = runs_with_file[fi]
                parts = []
                # Run number, if there are more than one runs
                if len(runs) > 1:
                    parts.append(run_nb)
                # Argument number, if there are more than one file arguments
                if nb_file_args[run_nb] > 1:
                    parts.append(arg_nb)
                file_names[fi] = make_unique(
                    'arg%s' % '_'.join('%s' % s for s in parts))
            else:
                file_names[fi] = make_unique('arg_%s' % fi.unicodename)
        else:
            file_names[fi] = make_unique(fi.unicodename)

    return dict((n, InputOutputFile(p, readers.get(p, []), writers.get(p, [])))
                for p, n in iteritems(file_names))