当跑步者调用'@Before'方法时，Spring不会自动关联字段

问题描述

我进行了以下测试:

@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() {
        ...
     }

及其后的跑步者:

@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());
        }
    }

当我通过跑步者开始测试时，我看到有时标记为@Before的方法login会抛出NullPointerException，因为sessionsHolder为空.

When I start test via runner I see that sometimes method login marked as @Before throws NullPointerException because sessionsHolder is null.

如何避免呢?

推荐答案

似乎@Parameterized与junit规则不能很好地融合在一起.一种选择是通过在参数化测试类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setup方法.

It seems that @Parameterized does not mix well with junit rules. One option would be to replace the Rule by performing the logic in the constructor of the parameterized test class, or calling a setup method at the beginning of your test methods.

在任何一种情况下，您都可以使用TestContextManager像这样用@AutoWired值填充测试类:

In either case you can use TestContextManager to populate your test class with the @AutoWired values like this:

private TestContextManager testContextManager;

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

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