No Tests Found with Test Runner 'Junit 4'

No JUnit tests found' in Eclipse

Right Click on Project > Properties > Java Build Path > Add the Test folder as source folder.

All source folders including Test Classes need to be in Eclipse Java Build Path. So that the sources such as main and test classes can be compiled into the build directory (Eclipse default folder is bin).

Eclipse No tests found using JUnit 5 caused by NoClassDefFoundError for LauncherFactory

You ran into Eclipse bug 525948 which has already been fixed and which will be published in the upcoming release Oxygen.3 (4.7.3), March 21, 2018.

As workaround, put your test code in a separate project and add the project under test to the modulepath, but do not add a module-info.java to your test project. With your project, class and module naming, it should look something like this:

See also my video that shows Java 9 and JUnit 5 in Eclipse Oxygen.1a in action

Eclipse No tests found using JUnit 5 caused by NoClassDefFoundError for LauncherFactory

You ran into Eclipse bug 525948 which has already been fixed and which will be published in the upcoming release Oxygen.3 (4.7.3), March 21, 2018.

As workaround, put your test code in a separate project and add the project under test to the modulepath, but do not add a module-info.java to your test project. With your project, class and module naming, it should look something like this:

See also my video that shows Java 9 and JUnit 5 in Eclipse Oxygen.1a in action

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