java - 如何编写junit mockito测试用例

Question

如何编写 Junit、Mockito 测试用例，用于使用 if-else 条件示例绑定(bind)结果 @Valid 功能？

@RequestMapping(value = "/scriptfile", method = RequestMethod.POST)     
public String create(
    @Valid ScriptFile scriptFile, 
    BindingResult result, 
    ModelMap modelMap
) 
{         
    if (scriptFile == null) 
        throw new IllegalArgumentException("A scriptFile is required"); 

    if (result.hasErrors()) {                 
        modelMap.addAttribute("scriptFile", scriptFile);                     
        modelMap.addAttribute("showcases", ShowCase.findAllShowCases());                     
        return "scriptfile/create";                 
    }             
    scriptFile.persist();             
    return "redirect:/scriptfile/" + scriptFile.getId();         
}   

如何为上面的示例编写 Junitm Mockito 测试用例？

Answer 1

事情会是这样的。如果可以实例化对象，则可以使用 spy 而不是模拟。或者甚至创建一个 ModelMap 实例并检查属性是否设置正确而不是模拟。

@Mock
private BindingResult result;

@Mock
private ModelMap modelMap;

@Mock 
private ScriptFile scriptFile;

@BeforeMethod
public void setUp() throws Exception {
    MockitoAnnotations.initMocks(this);
}

@Test(expectedExceptions = {IllegalArgumentException.class})  
public void shouldThrowIllegalArgumentException() {
    create(null, result, modelMap);
}

@Test
public void shouldPersistFile() {
    Mockito.when(result.hasErrors()).thenReturn(false);
    Mockito.when(scriptFile.getId()).thenReturn("FILE_ID");

    String output = create(scriptFile, result, modelMap);

    Mockito.verify(scriptFile, times(1)).persist();
    assertEquals("redirect:/scriptfile/FILE_ID", output)
}

@Test
public void shouldHandleErrors() {
    Mockito.when(result.hasErrors()).thenReturn(true);
    Mockito.when(scriptFile.getId()).thenReturn("FILE_ID");

    String output = create(scriptFile, result, modelMap);

    Mockito.verify(modelMap, times(2)).addAttribute(Mockito.any(), Mockito.any());
    assertEquals("scriptfile/create", output)
}