JUnit 异常测试 [英] JUnit Exception Testing

问题描述

目前没有可用的 JUnit 4.

Not JUnit 4 available at this time.

你好，

我有一个关于使用 JUnit 进行智能"异常测试的问题.这个时候，我是这样做的:

I have a question about "smart" exception testing with JUnit. At this time, I do it like this:

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，对于每个应该抛出异常的函数，我都需要一个 try/catch 块.这似乎不是一个好方法 - 或者有没有可能减少 try/catch 的使用?

As you can see, I need one try/catch block for each function that is supposed to throw an exception. It seems not to be a good way to do this - or is there no possibility to reduce the use of try/catch?

推荐答案

我建议您需要将 testGet 分解为多个单独的测试.各个 try/catch 块似乎彼此非常独立.您可能还想将常见的初始化逻辑提取到其自己的设置方法中.

I suggest that you need to break up testGet into multiple separate tests. The individual try/catch blocks seem to be pretty independent of each other. You may also want to extract the common initialization logic into its own setup method.

一旦你有了它，你就可以使用 JUnit4 的异常注释支持，就像这样:

Once you have that, you can use JUnit4's exception annotation support, something like this:

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());
}
}

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