Spring 运行器调用“@Before”方法时不会自动装配字段

Spring doesn't autowire fields when runner invokes '@Before' method

我有以下测试:

@RunWith(Parameterized.class)
@SpringBootTest
@ContextConfiguration(classes = MyConfig.class)
public class OrderPlacementCancelTest {
    @Autowired
    private TestSessionsHolderPerf sessionsHolder;

    @ClassRule
    public static final SpringClassRule SPRING_CLASS_RULE = new SpringClassRule();

    @Rule
    public final SpringMethodRule springMethodRule = new SpringMethodRule();

    private CommonCredentialSetter commonCredentialSetter;

    @Before
    public void login() throws InterruptedException {        
        int attempts = 0;
        while (!sessionsHolder.isClientLoggedIn() && attempts < 3) {
            Thread.sleep(1000);
            ++attempts;
        }

    }
     @Parameterized.Parameters()
     public static Collection<Object[]> data() {
        ...
     }

及以下参赛者:

@Test
    public void test() throws Exception {
        Class[] cls = {OrderPlacementCancelTest.class};
        Result result = JUnitCore.runClasses(new ParallelComputer(false, true), cls);
        logger.info("Failure count={}", result.getFailureCount());
        for (Failure failure : result.getFailures()) {
            logger.error(failure.getTrace());
        }
    }

当我通过 runner 开始测试时,我看到 有时 标记为 @Before 的方法 login 抛出 NullPointerException 因为 sessionsHolder 为空。

如何避免?

看来 @Parameterized 与 junit 规则不能很好地融合。一种选择是通过在参数化测试 class 的构造函数中执行逻辑来替换 Rule,或者在测试方法的开头调用设置方法。

在任何一种情况下,您都可以使用 TestContextManager 使用 @AutoWired 值填充您的测试 class,如下所示:

private TestContextManager testContextManager;

@Before
public void login() throws Exception {
    testContextManager = new TestContextManager(getClass());
    testContextManager.prepareTestInstance(this);