blocks|key|1003377|text|在JUnit+4中，您可以使用注释。然而，你应该将你的测试分成3个不同的方法，这样才能干净利落地工作。注意，IMHO在第一个场景中捕获异常应该是失败的，因此我相应地修改了catch块。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1003378|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)+{
++++++++fail(e.getMessage());
++++}
}

@Test(expected=RapsManagerException.class)
public+void+testGetWithInvalidId()+{
++++SoundFileManager+sfm+=+new+SoundFileManager();

++++sfm.getSoundfile(-100);
}

@Test(expected=RapsManagerException.class)
public+void+testGetWithInvalidName()+{
++++SoundFileManager+sfm+=+new+SoundFileManager();

++++sfm.getSoundfileByName(new+String());
}|code-block|syntax|javascript|1003379|entityMap^0|2D|5|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

With JUnit 4, you can use annotations instead. However, you should separate your test into 3 distinct methods for this to work cleanly. Note that IMHO catching an exception in the first scenario should be a failure, so I modified the <code>catch</code> block accordingly.

<pre><code>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) {
 fail(e.getMessage());
 }
}

@Test(expected=RapsManagerException.class)
public void testGetWithInvalidId() {
 SoundFileManager sfm = new SoundFileManager();

 sfm.getSoundfile(-100);
}

@Test(expected=RapsManagerException.class)
public void testGetWithInvalidName() {
 SoundFileManager sfm = new SoundFileManager();

 sfm.getSoundfileByName(new String());
}
</code></pre>

blocks|key|1217764|text|如果你有一个预期的异常，并且你不能使用注解来捕获它，你需要捕获它并断言你已经得到了你所期望的。例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1217765|Throwable+caught+=+null;
try+{
+++somethingThatThrows();
}+catch+(Throwable+t)+{
+++caught+=+t;
}
assertNotNull(caught);
assertSame(FooException.class,+caught.getClass());|code-block|syntax|javascript|1217766|如果您可以使用注释来代替，那么这样做会更清楚。但这并不总是可能的(例如，因为您正在测试一系列方法，或者因为您正在使用JUnit+3)。|1217767|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If you have an expected exception and you can't use an annotation to trap it, you need to catch it and assert that you've got what you expected. For example:

<pre><code>Throwable caught = null;
try {
 somethingThatThrows();
} catch (Throwable t) {
 caught = t;
}
assertNotNull(caught);
assertSame(FooException.class, caught.getClass());
</code></pre>

If you can use an annotation instead, do that as it's much clearer. But that's not always possible (e.g., because you're testing a sequence of methods or because you're using JUnit 3).

blocks|key|1217813|text|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。您可能还希望将公共初始化逻辑提取到它自己的设置方法中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1217814|一旦你有了它，你就可以使用JUnit4的异常注释支持，如下所示：|1217815|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());
}
}|code-block|syntax|javascript|1217816|entityMap^0|7|7|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

I suggest that you need to break up <code>testGet</code> 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.

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

<pre><code>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());
}
}
</code></pre>

blocks|key|1003511|text|catch-exception提供了最简洁的语法|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1003512|public+void+testGet()+{
++++SoundFileManager+sfm+=+new+SoundFileManager();
++++...+//+setup+sound+file+manager

++++verifyException(sfm,+RapsManagerException.class)
+++++++.getSoundfile(-100);

++++verifyException(sfm,+RapsManagerException.class)
+++++++.getSoundfileByName(new+String());
}|code-block|syntax|javascript|1003513|entityMap|0|LINK|mutability|MUTABLE|url|http://code.google.com/p/catch-exception/^0|0|F|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

The most concise syntax is provided by <a href="http://code.google.com/p/catch-exception/" rel="nofollow">catch-exception</a>:

<pre><code>public void testGet() {
 SoundFileManager sfm = new SoundFileManager();
 ... // setup sound file manager

 verifyException(sfm, RapsManagerException.class)
 .getSoundfile(-100);

 verifyException(sfm, RapsManagerException.class)
 .getSoundfileByName(new String());
}
</code></pre>

blocks|key|1003543|text|在Java8中，您可以使用lambda表达式来更严格地控制何时抛出异常。如果您使用注解方法，那么您只是断言异常是在test方法中的某个地方抛出的。如果您在测试中执行多行代码，那么当测试失败时，您将冒着通过测试的风险。Java+8解决方案是这样的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1003544|static+void+<T+extends+Exception>+expectException(Class<T>+type,+Runnable+runnable)+{
++++try+{
++++++++runnable.run()
++++}+catch+(Exception+ex)+{
++++++++assertTrue(ex.getClass().equals(type));
++++++++return;
++++}
++++assertTrue(false);
}|code-block|syntax|javascript|1003545|用法：|1003546|@Test
public+void+test()+
++++MyClass+foo+=+new+MyClass();
++++//+other+setup+code+here+....
++++expectException(MyException.class,+()+->+foo.bar());
}|1003547|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In Java 8, you can use lambda expressions to get tighter control over when the exception is thrown. If you use the annotations method then you're only asserting that the exception is thrown somewhere in the test method. If you're executing more than one line of code in the test then you risk your test passing when it should fail. Java 8 solution is something like this.

<pre><code>static void &lt;T extends Exception&gt; expectException(Class&lt;T&gt; type, Runnable runnable) {
 try {
 runnable.run()
 } catch (Exception ex) {
 assertTrue(ex.getClass().equals(type));
 return;
 }
 assertTrue(false);
}
</code></pre>

Usage:

<pre><code>@Test
public void test() 
 MyClass foo = new MyClass();
 // other setup code here ....
 expectException(MyException.class, () -&gt; foo.bar());
}
</code></pre>

Edit: Not JUnit 4 available at this time. 

Hi there,

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

<pre><code>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());
 }

 }
</code></pre>

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?

JUnit Exception Testing

Java

编辑: JUnit 4暂时不可用。你好啊，我有一个关于JUnit的“智能”异常测试的问题。在这个时候，我这样做：public void testGet() {    SoundFileManager sfm = new SoundFileManager();        // Test adding a sound ...

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