如何验证在方法内部启动的方法？

Question

如何验证是否调用了printPreview.createShowReport();。我什至无法设置模拟对象，因为一旦我调用该方法，它就会实例化为 null 并创建新对象。

     public void previewOrDirectPrint(File file, boolean val) {
                try{
                    printPreview=null;
                    printPreview=new ExamReportPrintUI(this,file);

                }
                catch(Exception e){
                    e.printStackTrace();
                }
                if(!val)
                {
                    printPreview.createShowReport();
                }
                else
                {
                    printPreview.createHideReport();
                    printInitiate();
                    closeReportPreview();

                }

    here is my test case 
    @Test
        public void testpreviewOrDirectPrint()
        {
            File file=new File("/Desktop/config/reportTemplate.html");
            examReportManager.previewOrDirectPrint(file, false);
            assertNotNull(Whitebox.getInternalState(examReportManager, "printPreview"));

    }

Can anyone help me how to access the object or create mock and set to it. I can only verify if the object is mock.

我尝试使用Whitebox.setInternalstate("obj","",mockobject). 进行设置，但两个对象不同。

Answer 1

不使用 PowerMockito 的解决方案如下：

1) 添加一个负责返回ExamReportPrintUI 实例的方法，并更改被测方法以通过这种方式获取该实例：

    public void previewOrDirectPrint(File file, boolean val) {
       try{
          printPreview=null;
          printPreview= getExamReportInstance(this,file);

       }
       ...
     }

     ExamReportPrintUI getExamReportInstance(ExamReportManager e, File f){
         return new ExamReportPrintUI(e,f);
     }

2) 监视管理器并模拟 getExamReportInstance 方法以返回所需的模拟：

    @Test
    public void testpreviewOrDirectPrint()
    {
         ExamReportManager spyManager = Mockito.spy(examReportManager);

        doReturn(examReportPrintUIMock).when(spyManager).getExamReportInstance(Mockito.any(ExamReportManager.class), Mockito.any(File.class));

        File file=new File("/Desktop/config/reportTemplate.html");
        examReportManager.previewOrDirectPrint(file, false);
        assertNotNull(Whitebox.getInternalState(examReportManager,printPreview"));

    }

现在您可以控制该类的实例，并且可以注入已配置的模拟。

使用 PowerMockito

  @RunWith(PowerMockRunner.class)
  @PrepareForTest(ExamReportPrintUI.class)
  public ExamReportManagerTest{

    @Mock
    ExamReportPrintUI examReportPrintUIMock;

    @Test
    public void testpreviewOrDirectPrint()
    {
        PowerMockito.whenNew(examReportPrintUI.class)
         .withArguments(Mockito.any(ExamReportManager.class), Mockito.any(File.class))
         .thenReturn(examReportPrintUIMock);

        File file=new File("/Desktop/config/reportTemplate.html");
        examReportManager.previewOrDirectPrint(file, false);
        assertNotNull(Whitebox.getInternalState(examReportManager, "printPreview"));

    }

 }