    @Test
    public void testCommandWithFileOption() throws IOException {


        GraalReflectionFileGenerator generator = new GraalReflectionFileGenerator();
        CommandLineParser<CommandInvocation> parser = getParser(TestCommand3.class);

        StringWriter writer = new StringWriter();
        generator.generateReflection(parser, writer);
        assertEquals(readFile("src/test/resources/graal3"), writer.toString());
    }