PowerMockito 模拟最终类 gson.fromJson() 返回 null

Question

我在主类中有这段代码 -

try {
    extraPlayer = gson.fromJson(jsonResponse, ExtraPlayer.class);// this returns null
} catch (Exception e) {
    e.printStacktrace();
}

这里 extraPlayer 为空 我嘲笑@Mock Gson gsonMock；

这里ExtraPlayer是一个静态类。

我已经编写了这个测试代码 -

@Test
public void test() {
    String jsonResponse = "{\"status\":\"waiting\",\"no\":\"12\"}";
    when(playerHandlerMock.resetPlayer("someString", "someString", "1",true    
         )).thenReturn(jsonResponse);       
    Gson gsonMock = PowerMockito.mock(Gson.class);
    ExtraPlayer extraPlayer = new ExtraPlayer();
    extraPlayer.setNo("12");
    extraPlayer.setStatus("Waiting");

    PowerMockito.mockStatic(ResetModemResponse.class); // using this for static class but didn't work.

    PowerMockito.when(gsonMock.fromJson(jsonResponse, ExtraPlayer.class)).thenReturn(extraPlayer);

    playerMock.performWaiting();
}

ExtraPlayer.java

public static class ExtraPlayer{

    String no;
    String status;      

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public String getNo() {
        return code;
    }

    public void setNo(String no) {
        this.no = no;
    }

}

我已将这些注释添加到测试类中 -

@RunWith(PowerMockRunner.class)
@PrepareForTest(Gson.class)

为什么 extraPlayer 为空？请帮忙/建议。

Answer 1

如果您要在mockito中使用标准的

@Mock

和

@InjectMocks

注释，那么是的，框架会负责将mock注入到被测试的类中（无论setter等是否存在）。

另一件事是

playerMock

，我认为它是正在测试的类。

不要模拟被测试的类，创建一个普通实例，然后注入依赖项...

performWaiting

方法似乎不接受响应字符串，所以你也必须以某种方式注入它（除非你留下了一些部分）出）：

@Test
public void test() {
    // Arrange
    String jsonResponse = "{\"status\":\"waiting\",\"no\":\"12\"}";     
    Gson gsonMock = PowerMockito.mock(Gson.class);
    ExtraPlayer extraPlayer = new ExtraPlayer();
    extraPlayer.setNo("12");
    extraPlayer.setStatus("Waiting");

    PowerMockito.when(gsonMock.fromJson(jsonResponse, ExtraPlayer.class)).thenReturn(extraPlayer);

    Player player = new Player();
    player.setGson(gsonMock);
    player.setResponse(jsonResponse);

    // Act
    player.performWaiting();

    // Assert ...
}