Java JUnit test case with exceptions

Question

what's wrong with this. I have junit 4 enter image description here

How do I catch the two exceptions correctly in junit, because right now they are being caught and my tests are failing. — Wang-Zhao-Liu Q, May 14 '13 at 20:48
Show us more of your test, and the stack trace of the exception. The snippet you gave doesn't even invoke the constructor. Tell us what you're trying to test. — JB Nizet, May 14 '13 at 20:51

score 5 · Accepted Answer · edited May 23 '17 at 12:21

You can declare on the @Test annotation that, for the test to pass, it must throw these exceptions:

@Test(expected = NullPointerException.class)
public void testSynapseOne() {
    // test
}


@Test(expected = IllegalStateException.class)
public void testSynapseTwo() {
    // test
}

Of course, you have to be sure you're testing the right thing - currently, your tests don't make use of the constructor, which is the critical piece you want to test.

Oh - you don't want to have your tests extend TestCase unless you need compatibility with JUnit3.x.

score 2 · Answer 2 · answered May 14 '13 at 20:50

2

You can use the annotation @Test(expected = TheClassException.class) to write a test which is supposed to throws the exception of class TheClassException

answered May 14 '13 at 20:50

Alexis C.

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Java JUnit test case with exceptions

2 Answers2