I need to make a test in junit that passes if an exception is thrown, but fail time and again.
I read a bunch of questions and answers on the topic here in stackoverflow and on other sources. Eventually I came across this page, that explains the usage of Class ExpectedException, by junit.org.
Since I could not get my own test working I copied their bare-bones example and it still did not work.
here is my code:
import static org.junit.jupiter.api.Assertions.*; import org.junit.Rule; import org.junit.jupiter.api.Test; import org.junit.rules.ExpectedException; class AssertExceptionTest { @Rule public ExpectedException thrown= ExpectedException.none(); @Test public void throwsNothing() { // no exception expected, none thrown: passes. } @Test public void throwsExceptionWithSpecificType() { thrown.expect(NullPointerException.class); throw new NullPointerException(); } } Citing from the page I mentioned above, the explanation goes "...After specifiying the type of the expected exception your test is successful when such an exception is thrown and it fails if a different or no exception is thrown...
Problem is that the test still fails, no matter what I do, and it fails because of what I am trying to verify: throwing NullPointerException.
I thought that maybe, because I am using junit 5, my test fails. However, this question from stackoverflow suggests otherwise: the guy asking the question mentions he is using junit 5 in eclipse the same way as in my code, successfully.
Technical details: eclipse version: 2019-12 (4.14.0) junit version: junit 5 working on Ubuntu, version: 18.04.2 LTS.
Update: I used assertThrows(), and it worked for me. However, I am still puzzled over the reason I didn't succeed with the methods described above, which many people here suggest.
Thanks in advance!
