JUNIT Eclipse - java.lang.ClassNotFoundException

All my tests using JUNIT do not work anymore. I tried unhappily removing all / bin and some other files from the .project .classpath configuration. Okay so far was a lot of bullshit, then tried to create another project and only pass the classes but I realized that JUNIT does not work on any project.

Does anyone have any ideas? GITHUB

Class:

package br.test;

import org.junit.Test;

public class TestMotosPersist {


    @Test
    public void criaMotos(){
        int a = 1;
    }
}

Errors:

TestMotosPersist [JUnit]    
    org.eclipse.jdt.internal.junit.runner.RemoteTestRunner at localhost:60874   
        Thread [main] (Suspended (exception ClassNotFoundException))    
            owns: Object  (id=22)   
            owns: Object  (id=23)   
            URLClassLoader$1.run() line: 366    
            URLClassLoader$1.run() line: 355    
            AccessController.doPrivileged(PrivilegedExceptionAction<T>, AccessControlContext) line: not available [native method]   
            Launcher$ExtClassLoader(URLClassLoader).findClass(String) line: 354 
            Launcher$ExtClassLoader(ClassLoader).loadClass(String, boolean) line: 425   
            Launcher$AppClassLoader(ClassLoader).loadClass(String, boolean) line: 412   
            Launcher$AppClassLoader.loadClass(String, boolean) line: 308    
            Launcher$AppClassLoader(ClassLoader).loadClass(String) line: 358    
            LauncherHelper.checkAndLoadMain(boolean, int, String) line: 482 
    /usr/lib/jvm/java-7-openjdk-amd64/bin/java (07/05/2015 21:58:01)    

This happens in all tests in any project, I have tried to reassemble project, restart eclipse..etc

Who wants to see the full source GITHUB