Re: Java - Junit distinguish exceptions

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Newsgroups:

comp.lang.java.programmer

Date:

Fri, 10 Dec 2010 13:22:13 -0800

Message-ID:

<idu5m9$7g6$1@news.eternal-september.org>

On 12/10/2010 6:38 AM, John wrote:

JUnit has a built in way to tell whether an exception was thrown when
it should have been:

@Test(expected=IllegalArgumentException.class)

That is very cool, thanks for pointing that out. I've always just
caught the exception like Lew. One advantage of the latter method is I
think that you can test a large number of vectors in a loop. Whereas
using the built in feature necessitates that you exit the test immediately.

Here's an actual live example:

for( String test: testVectors ) {
       ByteArrayInputStream ins = new ByteArrayInputStream(
                                                  test.getBytes() );
       MultiBufferCharSeq instance = new MultiBufferCharSeq( ins, null );

       Class<IllegalArgumentException> expResult =
               IllegalArgumentException.class;
       Class<?> result = null;

       try {
           char dummy = instance.setIndex( -1 );
       } catch( IllegalArgumentException ex ) {
           result = ex.getClass();
       }
       assertSame( expResult, result );
   }
}