Running Groovy test cases with JUnit 5

Question

Maybe this is very simple, but I couldn\'t find any examples on the web:

I\'d like to use JUnit 5 to run a unit test implemented as a Groovy class. My current setup

Answer 1

JUnit requires all testing method to use return type void. Groovy's def keyword is compiled to an Object type, so your method compiles to something like this in Java:

import org.junit.jupiter.api.Test

public class UnitTest {

    @Test
    Object shouldDoStuff() {
        throw new RuntimeException();
    }
}

If you try this out as a Java test, it won't find the test case neither. The solution is very simple - replace def with void and your Groovy test case will be executed correctly.

---

src/test/groovy/UnitTest.groovy

import org.junit.jupiter.api.Test

class UnitTest {

    @Test
    void shouldDoStuff() {
        throw new RuntimeException()
    }
}

Demo: