Eclipse JUnit - possible causes of seeing “initializationError” in Eclipse window

Question

I know this question is pretty general but I haven\'t found any hints on why this error may show up. What are possible causes of seeing initalizationError in Eclips

Answer 1

For me, it was due to the "return type" of the test method. It should be "void"

Answer 2

For me it was a silly mistake. I inadvertently set the test as private instead of public:

@Test
private void thisTestWasCausingProblems() {
...
}

it should have been

@Test
public void thisTestIsOK() {
...
}

Answer 3

My problem was that my parent class had no @Test methodes. I used there only some utilities. When I declared it abstract it works.

Answer 4

If you're using the xtend language (or some other JVM lang with type inference) and haven't explicitly defined the return type then it may be set to a non-void type because of the last expression, which will make JUnit fail.

Answer 5

I had the same problem, the solution for me is the following.

I had only install the junit.jar file from the web, but this library related with the hacrest-core.jar When I downloaded the hacrest-core.jar file and added it in my project everything works fine.

Answer 6

Just if this helps, I was using Junit5 but the @RunWith(SpringRunner.class) was pointing towards import org.springframework.test.context.junit4.SpringRunner, which was messing around with things and hence was giving the initialization error. I fixed this and it worked.