Maven 3 and JUnit 4 compilation problem: package org.junit does not exist

Just to have an answer with the complete solution to help the visitors:

All you need to do is add the junit dependency to pom.xml. Don’t forget the <scope>test</scope>

<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.11</version>
  <scope>test</scope>
</dependency>