java - Junit 5，Mockito，构造函数不初始化值

Question

我正在尝试执行简单的单元测试，但是我有一个有点问题的构造函数，其中字符串是在通过@Value 注入期间创建的。组件字段和构造函数的实现如下所示：

private final RestTemplate restTemplate;
private final ObjectMapper mapper;

private final String movieServiceUrl;
private final String recommendationServiceUrl;
private final String reviewServiceUrl;

@Autowired
public MovieCompositeIntegration(
        RestTemplate restTemplate,
        ObjectMapper mapper,

        @Value("${app.movie-service.host}") String movieServiceHost,
        @Value("${app.movie-service.port}") int movieServicePort,

        @Value("${app.recommendation-service.host}") String recommendationServiceHost,
        @Value("${app.recommendation-service.port}") int recommendationServicePort,

        @Value("${app.review-service.host}") String reviewServiceHost,
        @Value("${app.review-service.port}") int reviewServicePort
) {
    this.restTemplate = restTemplate;
    this.mapper = mapper;

    movieServiceUrl = "http://" + movieServiceHost + ":" + movieServicePort + "/movie/";
    recommendationServiceUrl = "http://" + recommendationServiceHost + ":" + recommendationServicePort + "/recommendation?movieId=";
    reviewServiceUrl = "http://" + reviewServiceHost + ":" + reviewServicePort + "/review?movieId=";
}

首先，我认为可以通过使用 @TestPtopertySource 注释来实现使用模拟属性，但是这是无法做到的，因为这些字段就像movieServiceUrl 一样不能被模拟，因为它们是最终的。所以我坚持认为，与其在 MovieCompositeIntegration 类上模拟和使用 @InjectMocks 相比，不如硬编码它的构造函数，例如：

@BeforeEach
    void setUp() {
        MockitoAnnotations.initMocks(this);
        movieCompositeIntegration = new MovieCompositeIntegration(
                restTemplate,
                mapper,
                "localhost", 7001,
                "localhost", 7001,
                "localhost", 7001
        );

    }

构造函数的逻辑应该用这个硬编码的值初始化，但是它会返回 NPE 作为结果。

  @Test
    void getUrl() {
        assertTrue(movieServiceUrl.contains("localhost"), "Acual: " + movieServiceUrl);
    }

会抛出：

java.lang.NullPointerException
    at com.geborskimateusz.microservices.composite.movie.services.MovieCompositeIntegrationTest.getUrl(MovieCompositeIntegrationTest.java:55)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:515)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:115)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:170)
    at org.junit.jupiter.engine.execution.ThrowableCollector.execute(ThrowableCollector.java:40)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:166)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:113)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:58)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:105)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:95)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:71)
    at java.util.ArrayList.forEach(ArrayList.java:1257)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:110)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:95)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:71)
    at java.util.ArrayList.forEach(ArrayList.java:1257)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:110)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:95)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:71)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:220)
    at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:188)
    at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:202)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:181)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128)
    at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

我怎样才能实现这样的构造函数初始化？

标签： javaspringjunitmockitojunit5