JUnit异常测试
问题内容:
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?
问题答案:
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());
}
}