Hello Mockito

 

This Tutorial will show you how to write a simple Mockito based Unit Test

 

Main Learning's

After following this tutorial you will learn how to:

• Download and install Mockito
• Use Mockito in Eclipse
• Create a Mockito based Unit Test
• Compile and run the ~Mockito based Unit Test
   

Versions used:

• Eclipse SDK 3.3.1
• JDKversion 1.5.0_12
• Mockito

 

Assumptions:

 

The JDK is properly installed

You are familiar with Eclipse IDE from Java

 

Tutorial Steps:

1. Go to http://code.google.com/p/mockito/
2. Download a stable version of Mockito – e.g mockito1.2
3. Extract mockito-1.1.2.zip to a folder – e.g C:Program Files/mockito-1.2.0
4. Open Eclipse for Java IDE
5. Create a new project (name it helloMockito)
   1. Click on Finish
6. Create a ITranslator interface
   1. Make sure ITranslator interface has the following code
   2. package org.helloopensource.greetings;

 

                    public interface ITranslator {

                   

                            public abstract String translate(String fromLanguage, String toLanguage, String word);

 

                    }

 

 

1. Create a Greeting class
   1. Make sure Greeting class has the following code
   2. package org.helloopensource.greetings;

 

                    public class Greeting {

                            private ITranslator translator;

 

                            public Greeting(ITranslator translator) {

                                    this.translator = translator;

                             }

 

                            public String sayHello(String language, String name) {

                                    return translator.translate("English", language, "Hello") + " " + name;

                            }

                    }

1. Add the mockito-all-1.2.jar to the build path
   1. Click on add external JARs
   2. Select the mockito-all-1.2.jar files (e.g C:Program Files/mockito-1.2.0/mockito-all-1.2.jar)
2. Create a new Unit Test (new / Unit Test)
   1. Click on finish
   2. Make sure JUnit library is added to the build path
   3. Add the following code for the GreetingTest code:
   4. package org.helloopensource.greetings;

 

 

                    import static org.junit.Assert.*;

                    import static org.mockito.Mockito.stub;

                    import static org.mockito.Mockito.verify;

                    import static org.mockito.Mockito.mock;

 

                    import org.junit.Test;

 

 

 

                    public class GreetingTest {

 

                        @Test

                        public void shouldTestGreetingInItalian(){

                            //setup

                            ITranslator mockTranslator = mock(ITranslator.class);

                            Greeting greeting = new Greeting(mockTranslator);

                            stub(mockTranslator.translate("English", "Italian", "Hello")).toReturn("Ciau");

                           //execute

                            assertEquals("Ciau Paulo", greeting.sayHello("Italian", "Paulo"));

                            //verify

                            verify(mockTranslator).translate("English", "Italian", "Hello");

                        }

                    }      

 

1. Run GreetingTest Unit Test