public ApplicationBuilder environment(String environment) {
        this.environment = environment;
        return getThis();
    }
@Test
    void environment() {
        ApplicationBuilder builder = new ApplicationBuilder();
        Assertions.assertEquals("product", builder.build().getEnvironment());
        builder.environment("develop");
        Assertions.assertEquals("develop", builder.build().getEnvironment());
        builder.environment("test");
        Assertions.assertEquals("test", builder.build().getEnvironment());
        builder.environment("product");
        Assertions.assertEquals("product", builder.build().getEnvironment());
    }