Simple unit testing with JUnit and Mockito

JUnitTestCaseOne.java

import org.junit.Assert;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.mockito.runners.MockitoJUnitRunner;

import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;


/**
 * Created by lipelopeslage on 12/26/16.
 */
@RunWith(MockitoJUnitRunner.class)
public class JUnitTestCaseOne {

    private String name;

    //instancia mockavel de um objeto
    private Methods methods = mock(Methods.class);

    @Mock // essa annotation cria uma instancia mockavel como a de cima, mas graças a annotation @RunWith(MockitoJUnitRunner.class)
    private OtherMethods otherMethods;


    // configurar valores antes dos testes
    @Before
    public void setUp(){
        this.name = "Felipe";
        when(methods.showMessage()).thenReturn("This is not a message");
    }

    @Test
    public void metodoQualquer(){
        Assert.assertEquals("2 dividido por 2 deveria ser 1.", 1, 2/2);
    }

    @Test
    public void checaNome(){
        Assert.assertEquals("O nome deveria ser "+this.name, "Felipe", "Felipe");
    }

    @Test
    public void quandoMostrarResultados(){
        Assert.assertEquals("This is not a message", methods.showMessage());
    }

    @Test
    public void retornaDobro(){
        when(methods.showDouble(5)).thenReturn(10);
        when(methods.showDouble(10)).thenReturn(10);
        Assert.assertEquals(10, methods.showDouble(10));
    }

    @Test
    public void mostraCinco(){
        when(methods.showFive()).thenReturn(5);
        Assert.assertEquals(5, methods.showFive());
    }

    @Test
    public void mostraDez(){
        when(otherMethods.showTen()).thenReturn(10);
        Assert.assertEquals(10, otherMethods.showTen());
    }
}

class Methods{
    public String showMessage(){
        return "This is a message";
    }

    public int showFive(){
        System.out.println("testando");
        return 5;
    }

    public int showDouble(int n){
        return n * 2;
    }
}

class OtherMethods{
    public int showTen(){
        return 10;
    }
}

REFs:
http://www.qualister.com.br/blog/criando-mocks-com-mockito-parte-1-introducao
http://www.vogella.com/tutorials/Mockito/article.html#mock-object-generation
http://blog.caelum.com.br/facilitando-seus-testes-de-unidade-no-java-um-pouco-de-mockito/