JUnit4 and JUnit5 tests not running in IntelliJ

Use the following version of junit-jupiter-api :

<dependency>
  <groupId>org.junit.jupiter</groupId>
  <artifactId>junit-jupiter-api</artifactId> 
  <version>5.0.0-M4</version>
  <scope>test</scope>
</dependency>

And also use on version 5.0.0-M4 for all junit-jupiter dependencies.