“No tests were found” with Junit 5 and IntelliJ

问题

Q&A-Style question as the existing questions don't match the simple typo I made here:

Goal

• Execute simple JUnit tests via the IntelliJ IDE using the UI (right-click: run test)

Problem

• IntelliJ tells that "no tests were found"

Code

import org.junit.jupiter.api.Test;

public class Test {
    @Test
    private void testAMethod() { (...) }
}

回答1:

change to

public void testAMethod() { (...) }

According to Junit5 document

Test classes, test methods, and lifecycle methods are not required to be public, but they must not be private.

https://junit.org/junit5/docs/current/user-guide/

回答2:

The issue was a simply typo - the test was not visible from outside:

@Test
// Before
private void testAMethod() { (...) 
// After
void testAMethod() { (...) 

回答3:

Junit in IntelliJ won't work on Java 10 or above. Try downgrading the project SDK to Java 8 and the tests will work like a charm.

来源：https://stackoverflow.com/questions/59288305/no-tests-were-found-with-junit-5-and-intellij