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javajunitjunit4junit5

transition from @RunWith to @ExtendWith

I need the methodInvoker of JUnit4 in JUnit5 to wrap the execution of the test itself in a lambda expression. The given Interfaces like AfterTestExecutionCallback will not allow manipulating the execution itself. Kindly guide me with JUnit 4 to 5 migration? The transition from @RunWith to @ExtendWith. How can you wrap the execution of the test itself with JUnit 5?

Thanks

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Solution

  • You may do so via implementing and registering an InvocationInterceptor

    public class SwingEdtInterceptor implements InvocationInterceptor {

    @Override
    public void interceptTestMethod(Invocation<Void> invocation,
            ReflectiveInvocationContext<Method> invocationContext,
            ExtensionContext extensionContext) throws Throwable {

        AtomicReference<Throwable> throwable = new AtomicReference<>();

        SwingUtilities.invokeAndWait(() -> {
            try {
                invocation.proceed();
            }
            catch (Throwable t) {
                throwable.set(t);
            }
        });
        Throwable t = throwable.get();
        if (t != null) {
            throw t;
        }
    }
}

    Copied from https://junit.org/junit5/docs/current/user-guide/#extensions-intercepting-invocations

    Seems like your use-case might be a candidate for Dynamic Tests, aka Testlests: https://junit.org/junit5/docs/current/user-guide/#writing-tests-dynamic-tests -- did you give them a try?