PowerMock测试通过然后失败

Question

为什么我的单元测试在独立运行时通过，但在运行多个测试时失败？

当我执行单个单元测试时，我的测试将成功模拟并返回预期结果。但是，当我运行所有单元测试时，先前通过的测试将失败。

一次测试运行

shouldDoThisAgain（） - 通过

多重测试运行

shouldDoThis（） - 通过

shouldDoThisAgain（） - 失败

shouldDoThisAgainAgain（） - 失败

我的测试：

@PrepareForTest({OtherMethods.class}) 
@PowerMockIgnore("javax.management.*") 
@RunWith(PowerMockRunner.class) 
public class DbTest { 
    @Test 
    public void shouldDoThis() throws Exception() { 
     Dal dalMock = mock(Dal.class) 
     PowerMockito.whenNew(Dal.class).withAnyArguments().thenReturn(dalMock) 
     List<Result> results = new ArrayList<Result>(); 
     results.add(new Result(1,2,3)); 
     when(dalMock.getResults()).thenReturn(results) 
     assertTrue(Wrapper.MY_WRAPPER.run()); 
    } 
    @Test 
    public void shouldDoThisAgain() throws Exception() { 
     Dal dalMock = mock(Dal.class) 
     PowerMockito.whenNew(Dal.class).withAnyArguments().thenReturn(dalMock) 
     List<Result> results = new ArrayList<Result>(); 
     results.add(new Result(2,3,4)); 
     when(dalMock.getResults()).thenReturn(results) 
     assertTrue(Wrapper.MY_WRAPPER.run()); 
    } 
    @Test 
    public void shouldDoThisAgainAgain() throws Exception() { 
     Dal dalMock = mock(Dal.class) 
     PowerMockito.whenNew(Dal.class).withAnyArguments().thenReturn(dalMock) 
     List<Result> results = new ArrayList<Result>(); 
     results.add(new Result(6,5,3)); 
     when(dalMock.getResults()).thenReturn(results) 
     assertTrue(Wrapper.MY_WRAPPER.run()); 
    } 
} 

我的课：

public class Wrapper { 
    // not Runnable 
    public static final MyWrapper MY_WRAPPER = new MyWrapper(...){ 
     @Override 
     public boolean run() { 
      // returns empty list when the test is alone 
      // returns 'results' variable when ran with other tests alone 
      List<Result> results = OtherMethods.getDal().getResults(); 
      return !results.isEmpty() 
     } 
    }; 
} 

public class OtherMethods { 
    private static final Logger LOGGER = LogManager.getLogger(OtherMethods.class); 

    public static Dal dal; 

    static Dal getDal() { 
     if (dal == null) { 
      try { 
       dal = new Dal(); 
      } catch (Exception e) { 
       LOGGER.fatal("DB Connection could not be created for Geonames"); 
       LOGGER.fatal(e); 
      } 
     } 
     return dal; 
    } 
} 

Answer 1

我找到了我们项目的解决方案。我编写了一个调用Android内部静态日志方法的Logger类。我的一些测试没有直接测试Log类。当我忽略所有这些，powermockito为基础的测试变为绿色。但是当这些其他测试运行时，基于powermockito的测试会失败。有时。

这种做法会失败（片状）：

@RunWith(PowerMockRunner.class) 
@PrepareForTest({Log.class}) // WARNING: HERE BE DRAGONS! 
public class MyTest { 

    @Test 
    public void testMethodThatDoesNotUseStatics() { 
     // ... 
    } 

    @Test 
    public void usesStatics() { 
     // ... 
    } 

} 

后来我发现，你可以注释每个测试方法与@PrepareForTest，像这样：

@RunWith(PowerMockRunner.class) 
public class MyTest { 

    @Test 
    public void testMethodThatDoesNotUseStatics() { 
     // ... 
    } 

    @Test 
    @PrepareForTest({Log.class}) // that's the way :) 
    public void usesStatics() { 
     // ... 
    } 

} 

现在的测试是绿色的一次。耶为非片状测试！ :)

Answer 2

检查什么的@PrepareForTest({OtherMethods.class})时的行为置于一流水平...

已被删除以回应OP的评论
我只注意到别的东西：
我相信，你的MyWrapper类是Runnable，因此它只能run()一次，就需要重新初始化它为每个测试
删除

编辑： 然后您的问题是在您的实施OtherMethods类，你不显示它在这里，这使我们很难

Answer 3

尝试这样做

@PrepareForTest({OtherMethods.class}) 
@PowerMockIgnore("javax.management.*") 
@RunWith(MowerMockRunner.class) 
public class DbTest { 
@Before 
public void setUp(){ 
    Dal dalMock = mock(Dal.class);   
PowerMockito.whenNew(Dal.class).withAnyArguments().thenReturn(dalMock); 
List<Result> results = new ArrayList<Result>(); 
    results.add(new Result(1,2,3)); 
    when(OtherMethods.getDal().getResults()).thenReturn(results) 
} 
@Test 
public void shouldDoThis() throws Exception() { 

    assertTrue(Wrapper.MY_WRAPPER.run()); 
} 
@Test 
public void shouldDoThisAgain() throws Exception() { 

    assertTrue(Wrapper.MY_WRAPPER.run()); 
} 
@Test 
public void shouldDoThisAgainAgain() throws Exception() { 

    assertTrue(Wrapper.MY_WRAPPER.run()); 
} 
}