问Spring JUnit .properties文件不工作

EN

@RunWith(SpringJUnit4ClassRunner.class)
@TestPropertySource("classpath:jdbc.properties")
@ContextConfiguration({"classpath:applicationContext.xml","classpath:mvc-dispatcher-servlet.xml"})
@WebAppConfiguration

@Inject
private ApplicationContext context;
@Test
public void accessProperties(){
    MutablePropertySources sources = ((ConfigurableApplicationContext) context)
                .getEnvironment().getPropertySources();
    System.out.println("jdbcUrl=="+sources.iterator().next().getProperty("jdbcUrl"));
}