JUnit异常测试

Question

编辑：目前没有JUnit 4。

嗨，您好，

我对使用JUnit进行“智能”异常测试有疑问。目前，我这样做是这样的：

public void testGet() {

    SoundFileManager sfm = new SoundFileManager();

        // Test adding a sound file and then getting it by id and name.
        try {
            SoundFile addedFile = sfm.addSoundfile("E:\\Eclipse_Prj\\pSound\\data\\Adrenaline01.wav");
            SoundFile sf = sfm.getSoundfile(addedFile.getID());
            assertTrue(sf!=null);
            System.out.println(sf.toString());

            sf = sfm.getSoundfileByName("E:\\Eclipse_Prj\\pSound\\data\\Adrenaline01.wav");
            assertTrue(sf!=null);
            System.out.println(sf.toString());
        } catch (RapsManagerException e) {
            System.out.println(e.getMessage());
        }

        // Test get with invalid id. 
        try {
            sfm.getSoundfile(-100);
            fail("Should have raised a RapsManagerException");
        } catch (RapsManagerException e) {
            System.out.println(e.getMessage());
        }

        // Test get by name with invalid name
        try {
            sfm.getSoundfileByName(new String());
            fail("Should have raised a RapsManagerException");
        } catch (RapsManagerException e) {
            System.out.println(e.getMessage());
        }

    }

如您所见，对于每个应该引发异常的函数，我都需要一个try / catch块。似乎不是执行此操作的好方法-还是没有可能减少try / catch的使用？

Answer 1

我建议您需要分解testGet为多个单独的测试。各个try / catch块似乎彼此非常独立。您可能还希望将通用初始化逻辑提取到其自己的设置方法中。

一旦有了它，就可以使用JUnit4的异常注释支持，如下所示：

public class MyTest {

private SoundManager sfm;

@Before
public void setup() {
      sfm = new SoundFileManager();
}

@Test
public void getByIdAndName() {
  // Test adding a sound file and then getting it by id and name.
      SoundFile addedFile =              
      sfm.addSoundfile("E:\\Eclipse_Prj\\pSound\\data\\Adrenaline01.wav");
      SoundFile sf = sfm.getSoundfile(addedFile.getID());
      assertTrue(sf!=null);
      System.out.println(sf.toString());

      sf = sfm.getSoundfileByName("E:\\Eclipse_Prj\\pSound\\data\\Adrenaline01.wav");
      assertTrue(sf!=null);
      System.out.println(sf.toString());
}

@Test(expected=RapsManagerException.class)
public void getByInvalidId() {
      // Test get with invalid id. 
      sfm.getSoundfile(-100);
}

@Test(expected=RapsManagerException.class)
public void getByInvalidName() {
      // Test get with invalid id. 
      sfm.getSoundfileByName(new String());
}
}