Re: How do I use Junit to test whether catch the Exception

From:

"Daniel Dyer" <"You don't need it">

Newsgroups:

comp.lang.java.programmer,comp.lang.java.help

Date:

Thu, 13 Sep 2007 20:21:48 +0100

Message-ID:

<op.tylxemdh8kxvgr@jack.local>

On Thu, 13 Sep 2007 19:42:02 +0100, Joe Attardi <jattardi@gmail.com> wro=
te:

RC wrote:

For example
public void myMethod() {
    try {
        // do something;
    } catch (IOException ioe) {
        System.err.println(ioe);
    }
}
I want to use Junit to test myMethod whether
it catches the Exception or not
In Junit I only know
assertTrue
assertEquals
assertNotNull
is there method called assertCatch ?

Try something like:

public void testSomething() {
     try {
          myMethod();
     } catch (IOException ioe) {
        fail("myMethod() did not catch the IOException");
     }
}

I'm not too familiar with JUnit (I'm a TestNG guy), but I think that =

will do it...

I think the OP wants to do it the other way round, i.e. fail if the =

exception is not thrown. You'd probably have to set a flag in the catch=
  =

block and check it in a finally block, as Manish suggested.

TestNG makes this easy type of check easy:

    @Test(expectedExceptions = IOException.class)
    public void myTest()
    {
        myMethod();
    }

Dan.

-- =

Daniel Dyer
http//www.uncommons.org