Can't run JUnit tests in Play Framework and Eclipse

I'm trying to run some JUnit tests for my Play framework project but when I run a test I get the following error message:

Class not found ApplicationTest
java.lang.ClassNotFoundException: ApplicationTest
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at org.eclipse.jdt.inteal.junit.ruer.RemoteTestRuer.loadClass(RemoteTestRuer.java:685)
    at org.eclipse.jdt.inteal.junit.ruer.RemoteTestRuer.loadClasses(RemoteTestRuer.java:421)
    at org.eclipse.jdt.inteal.junit.ruer.RemoteTestRuer.runTests(RemoteTestRuer.java:444)
    at org.eclipse.jdt.inteal.junit.ruer.RemoteTestRuer.runTests(RemoteTestRuer.java:675)
    at org.eclipse.jdt.inteal.junit.ruer.RemoteTestRuer.run(RemoteTestRuer.java:382)
    at org.eclipse.jdt.inteal.junit.ruer.RemoteTestRuer.main(RemoteTestRuer.java:192)

I found this question and I tried some of the suggestions but nothing helped: java.lang.NoClassDefFoundError in junit