JUnit expected tag not working as expected

Question

I have the following test case in eclipse, using JUnit 4 which is refusing to pass. What could be wrong?

@Test(expected = IllegalArgumentException.class) public void testIAE() { throw new IllegalArgumentException(); }

This exact testcase came about when trying to test my own code with the expected tag didn't work. I wanted to see if JUnit would pass the most basic test. It didn't.

I've also tested with custom exceptions as expected without luck.

Screenshot:

This one is really weird, did some testing myself, and this code runs fine (the test is successfull)... — Torandi
– Torandi, Commented Jul 20, 2009 at 0:22

Yuri · Accepted Answer · 2023-11-21 14:23:30Z

105

The problem is that your nnounceThreadTest extends TestCase. Because it extends TestCase, the JUnit Runner is treating it as a JUnit 3.8 test, and the test is running because it starts with the word test, hiding the fact that the @Test annotiation is in fact not being used at all.

To fix this, remove the extends TestCase from the class definition.

edited Nov 21, 2023 at 14:23

Yuri

4,5482 gold badges32 silver badges48 bronze badges

answered Jul 20, 2009 at 1:21

Yishai

92.4k31 gold badges195 silver badges266 bronze badges

Sign up to request clarification or add additional context in comments.

7 Comments

Ben S Over a year ago

Thank you, this fixed it as advertised.

burtlo Over a year ago

After removing the extends TestCase, I had to add the additional import to ensure I had the static assert methods. import static org.junit.Assert.*;

matt b Over a year ago

Awesome job at finding the solution hidden as a hint in a screenshot

Dylan Knowles Over a year ago

Argggghhhh, I just spent an hour and a half on this issue without finding this answer. Thank you, thank you, thank you!

Seansms Over a year ago

The screen shot is a broken link now so we can't see what the original class looked like. I found that if I renamed my class and my tests to no longer start with "test" that suddenly @Begin works and "expected" works too. Thanks Yishai!

|

HsYoo · Accepted Answer · 2018-06-14 23:19:45Z

Instead of removing extends TestCase , you can add this to run your test case with Junit4 which supports annotation.

@RunWith(JUnit4.class)

duffymo · Accepted Answer · 2009-07-20 01:26:10Z

Just ran this in IntelliJ using JUnit 4.4:

 @Test(expected = IllegalArgumentException.class) public void testExpected() { throw new IllegalArgumentException(); }

Passes perfectly.

Rebuild your entire project and try again. There's something else that you're doing wrong. JUnit 4.4 is working as advertised.

Collectives™ on Stack Overflow

JUnit expected tag not working as expected

3 Answers 3

7 Comments

Comments

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

7 Comments

Comments

Comments

Linked

Related