def METHOD_NAME():
    with open("template", "w", encoding="utf-8") as template_file:
        template_file.write(mulitple_input_template)
    with open("parameters.json", "w", encoding="utf-8") as json_file:
        json_file.write(json.dumps(default_parameters))
    with open("second.json", "w", encoding="utf-8") as json_file:
        parameters = {"key1": {"subkey2": 1400}}
        json.dump(parameters, json_file)
    with open("third.json", "w", encoding="utf-8") as json_file:
        parameters = {
            "key1": {
                "subkey1": 3000.22,
            }
        }
        json.dump(parameters, json_file)
    render_template(["second.json", "third.json"], "template", "out_file")
    with open("out_file", "r", encoding="utf-8") as parameter_file:
        expected_output = (
            "FILENAME\n" + "F1 1999.22\n" + "OTH 1400\n" + "OTH_TEST 3000.22"
        )
        assert parameter_file.read() == expected_output