java - 如何将 JUnit TemporaryFolder @Rule 与 Spring @Value 属性一起使用？

Question

我可以在 junit 测试中生成 TemporaryFolder，并使用该文件夹作为 @Value 属性的前缀吗？

@RunWith(SpringRunner.class)
@SpringBootTest
public class MyTest {
    @Rule
    public TemporaryFolder tmp = new TemporaryFolder();


    @Autowired
    private MyService service;

    @Test
    public void test()  {
        //TODO how to rewrite the application property with the tmp folder created?
        service.run();
    }
}

@Service
public class MyService {
    @Value("${my.export.path}")
    private String path;

    public void run() {
        //generates a file and exports it to @Value path
    }
}

应用程序属性:

my.export.path=/var/www/export.csv

我当然想将导出路径设置为生成的tmp文件夹。但如何呢？

Answer 1

我可以通过重写 ApplicationContext 中的属性 @ClassRule 和 ApplicationContextInitializer 来解决这个问题。虽然它有效，但可能还有我仍然感兴趣的更好的解决方案!

@RunWith(SpringRunner.class)
@SpringBootTest
@ContextConfiguration(initializers = TemporaryFolderInitializer.class)
public class MyTest {
    @ClassRule
    public static TemporaryFolder tmp = new TemporaryFolder();

    public static class TemporaryFolderInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {
        @Override
        public void initialize(ConfigurableApplicationContext applicationContext) {
            TestPropertySourceUtils.addInlinedPropertiesToEnvironment(applicationContext, "my.export.path=" + tmp.getRoot().getAbsolutePath());
        }
    }
}