使用Mockito模拟一个post请求会在“when（event.request（） . getParam（”type“））上抛出NullPointerException . thenReturn（”application / octet-stream“）;”

我正在尝试使用Mockito模拟文件上传（使用Vertx），但它会在 when(event.request().getParam("type")).thenReturn("application/octet-stream"); 上使用的 NullPointerError 上抛出 NullPointerError

我的单元测试如下：

private UploadResultatenHandler uploadResultatenHandler;

@Mock
RoutingContext event;
File folder;
Set<io.vertx.ext.web.FileUpload> upload;
HttpServerRequest httpServerRequest;
HttpServerResponse httpServerResponse;

@Before
public void setUp() {
    uploadResultatenHandler = new UploadResultatenHandler();
    MockitoAnnotations.initMocks(this);

    when(event.request().getParam("type")).thenReturn("application/octet-stream");
    when(event.fileUploads()).thenReturn(upload);

    when(httpServerResponse.setStatusCode(200)).thenReturn(httpServerResponse);
    when(event.response()).thenReturn(httpServerResponse);
}

@Test
public void testCleanHandler() {
    uploadResultatenHandler.handle(event);
    verify(event).response();
}

“uploadResultatenHandler.handle（事件）;” ：

@Override
public void handle(RoutingContext event) {
    String newFileName = event.request().getParam("type");
    Set<FileUpload> uploads = event.fileUploads();
    System.out.println(uploads);
    for (FileUpload fileUpload : uploads) {
        String oldFileName = fileUpload.uploadedFileName();

        char[] inhoud = FileReader.readFileUTF8ToString(oldFileName).toCharArray();
        String fileExtention = setFileExtension(fileUpload.contentType());

        FileCreater.createFile(newFileName, fileExtention, "file-uploads/", inhoud);
        FileDeleter.deleteFile(oldFileName);
    }
    event.response().setStatusCode(200).end("Check");
}

private String setFileExtension(String type) {
    switch (type) {
    case "text/xml":
        return ".xml";
    case "application/octet-stream":
        return ".json";
    default:
        return ".txt";
    }
}

我认为它可能与没有此参数的模拟RoutingContext有关，但我不知道如何修复/绕过此错误？

我将行更改为when（event.request（）） . thenReturn（request）;当（request.getParam（ “类型”））thenReturn（ “应用程序/八位字节流”） . 和模拟：Mock（answer = Answers.RETURNS_DEEP_STUBS）RoutingContext事件; @Mock文件夹;设置上传; HttpServerRequest请求; HttpServerResponse响应;但我仍然得到一个NullPointer

堆栈跟踪：

java.lang.NullPointerException位于sun.reflect.NativeMethodAccessorImpl.invoke（未知来源）的sun.reflect.NativeMethodAccessorImpl.invoke0（本地方法）中的nl.icaprojecten.TestIntegratieQuintor.ServiceLayer.rest.UploadResultatenHandlerTest.setUp（UploadResultatenHandlerTest.java:42）在sun.reflect.DelegatingMethodAccessorImpl.invoke（来源不明）在java.lang.reflect.Method.invoke（来源不明）在org.junit.runners.model.FrameworkMethod $ 1.runReflectiveCall（FrameworkMethod.java:50）在org.junit .internal.runners.model.ReflectiveCallable.run（ReflectiveCallable.java:12）在org.junit.runners.model.FrameworkMethod.invokeExplosively（FrameworkMethod.java:47）在org.junit.internal.runners.statements.RunBefores.evaluate （RunBefores.java:24）在org.junit.runners.ParentRunner.runLeaf（ParentRunner.java:325）在org.junit.runners.BlockJUnit4ClassRunner.runChild（BlockJUnit4ClassRunner.java:78）在org.junit.runners.BlockJUnit4ClassRunner . org.junit.runne上的runChild（BlockJUnit4ClassRunner.java:57） rs.ParentRunner $ 3.run（ParentRunner.java:290）org.junit.runners.ParentRunner $ 1.schedule（ParentRunner.java:71）org.junit.runners.ParentRunner.runChildren（ParentRunner.java:288）at org .junit.runners.ParentRunner.access $ 000（ParentRunner.java:58）org.junit.runners.ParentRunner $ 2.evaluate（ParentRunner.java:268）org.junit.runners.ParentRunner.run（ParentRunner.java:363） ）org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run（JUnit4TestReference.java:86）at org.eclipse.jdt.internal.junit.runner.TestExecution.run（TestExecution.java:38）at org . eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests（RemoteTestRunner.java:459）处org.eclipse.jdt org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests（RemoteTestRunner.java:678） . org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main（RemoteTestRunner.java:192）中的internal.junit.runner.RemoteTestRunner.run（RemoteTestRunner.java:382）