Class not found br.com.alura.loja.ClienteTest

Podem me ajudar?

package br.com.alura.loja;

import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.WebTarget;

import org.junit.Test;

import junit.framework.Assert;

public class ClienteTest {

    @Test
    public void testaQueAConexaoComOServidorFunciona() {
        Client client = ClientBuilder.newClient();
        WebTarget target = client.target("http://www.mocky.io");
        String conteudo = target.path("/v2/52aaf5deee7ba8c70329fb7d").request().get(String.class);
        Assert.assertTrue(conteudo.contains("<rua>Rua Vergueiro 3185"));
    }
}

Class not found br.com.alura.loja.ClienteTest
java.lang.ClassNotFoundException: br.com.alura.loja.ClienteTest
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.loadClass(RemoteTestRunner.java:780)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.loadClasses(RemoteTestRunner.java:503)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:526)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:770)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:464)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:210)