PowerMock測試通過然後失敗

Question

爲什麼我的單元測試在獨立運行時通過，但在運行多個測試時失敗？

當我執行單個單元測試時，我的測試將成功模擬並返回預期結果。但是，當我運行所有單元測試時，先前通過的測試將失敗。

一次測試運行

shouldDoThisAgain（） - 通過

多重測試運行

shouldDoThis（） - 通過

shouldDoThisAgain（） - 失敗

shouldDoThisAgainAgain（） - 失敗

我的測試：

@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()); 
    } 
} 

我的課：

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

我找到了我們項目的解決方案。我編寫了一個調用Android內部靜態日誌方法的Logger類。我的一些測試沒有直接測試Log類。當我忽略所有這些，powermockito爲基礎的測試變爲綠色。但是當這些其他測試運行時，基於powermockito的測試會失敗。有時。

這種做法會失敗（片狀）：

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

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

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

} 

後來我發現，你可以註釋每個測試方法與@PrepareForTest，像這樣：

@RunWith(PowerMockRunner.class) 
public class MyTest { 

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

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

} 

現在的測試是綠色的一次。耶爲非片狀測試！ :)

Answer 2

檢查什麼的@PrepareForTest({OtherMethods.class})時的行爲置於一流水平...

已被刪除以迴應OP的評論
我只注意到別的東西：
我相信，你的MyWrapper類是Runnable，因此它只能run()一次，就需要重新初始化它爲每個測試
刪除

編輯： 然後您的問題是在您的實施OtherMethods類，你不顯示它在這裏，這使我們很難

Answer 3

嘗試這樣做

@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()); 
} 
}