Eclipse No Tests Found Using Junit 5 Caused by Noclassdeffounderror for Launcherfactory

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

Cant run the test class No tests found with test runner 'Junit5'

You only depend on the api, giving you e.g. the annotations, but you are missing the engine to execute your tests. Either add junit-jupiter-engine as dependency or switch to the convenience dependency junit-jupiter.

Look at the maven starter sample (https://github.com/junit-team/junit5-samples/tree/r5.7.1/junit5-jupiter-starter-maven), on how to get a minimal functional pom.xml for junit5.

Junit 5 tests don't launch in Eclipse due to NoClassDefFoundError: TestEngine

The problem was that I was missing the dependency to the engine library:

    <dependency>
        <groupId>org.junit.jupiter</groupId>
        <artifactId>junit-jupiter-engine</artifactId>
    </dependency>

Then, the tests run like a charm in Eclipse.

Migration blogs like https://dev.to/martinbelev/how-to-enable-junit-5-in-new-spring-boot-project-29a8 do mention this dependency, but I primarily worked with the JUnit 5 documentation, and somehow I must have overlooked this important piece of information there...

Import org.junit.Test throws error as No Test found with Test Runner JUnit 5

This org.junit.Test is a JUnit 4 annotation. A Junit5 test runner will not discover a test annotated with org.junit.Test.

A Junit5 test runner will discover a test annotated with org.junit.jupiter.api.Test.

So, this explains why you get "No Test found with Test Runner JUnit 5" when attempting to run a test context which does not contain any tests annotated with org.junit.jupiter.api.Test.

It sounds like you might be migrating from Junit4 to Junit5. If so, there are several changes you'll need to come to terms with. The Junit5 docs offer some useful tips including:

Annotations reside in the org.junit.jupiter.api package.

Assertions reside in org.junit.jupiter.api.Assertions.

Assumptions reside in org.junit.jupiter.api.Assumptions.

@Before and @After no longer exist; use @BeforeEach and @AfterEach
instead.

@BeforeClass and @AfterClass no longer exist; use @BeforeAll and
@AfterAll instead.

@Ignore no longer exists: use @Disabled or one of the other built-in
execution conditions instead

@Category no longer exists; use @Tag instead.

@RunWith no longer exists; superseded by @ExtendWith.

@Rule and @ClassRule no longer exist; superseded by @ExtendWith and
@RegisterExtension

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