Hello JMock

Main Learning's

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

Versions used:

• Eclipse SDK 3.2.2
• JDKversion 1.5.0_12
• JMock 2.2.0

Assumptions: 

The JDK is properly installed

You are familiar with Eclipse IDE fro Java

Tutorial Steps:

1. Go to http://www.jmock.org/download.html
   1. 
2. Download a stable version of JMock – e.g Stable: 2.2.0 Binary JARs
3. Extract jmock-2.2.0-jars.zip to a folder – e.g C:\Program Files\jmock
   1. 
   2. JMock 2.2.0 jar files
   3. 
4. Open Eclipse for Java IDE
5. Create a new project (name it helloJMock)
   1. 
   2. Click on Finish
6. Create a ITranslator interface
   1. 
   2. Make sure ITranslator interface has the following code
   3. package org.helloopensource.greetings;

      public interface ITranslator {

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

      }

7. Create a Greeting class
   1. 
   2. Make sure Greeting class has the following code
   3. 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;

          }

      }

8. Add the jmock JARs to the build path
   1. 
   2. Click on add external JARs
   3. Select all the jar files from the jmock JAR location (e.g C:\Program Files\jmock\jmock-2.2.0)
   4. 
   5. Click on Open
9. Create a new Unit Test (new / Unit Test)
   1. 
   2. Click on finish
   3. Make sure JUnit library is added to the build path
   4. Add the following code for the GreetingTest code:
   5. package org.helloopensource.greetings;

       

      import org.jmock.Expectations;

      import org.jmock.Mockery;

       

      import junit.framework.TestCase;

       

      public class GreetingTest extends TestCase {

          public void testGreetingInnyLanguage() throws Exception {

              // set up

              Mockery context = new Mockery();

              final ITranslator mockTranslator = context.mock(ITranslator.class);

              Greeting greeting = new Greeting(mockTranslator);

              // expectations

              context.checking(new Expectations() {{

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

                  will(returnValue("Ciau"));

              }});

              // execute

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

              // verify

              context.assertIsSatisfied();

          }

      }

10. Run GreetingTest Unit Test
    1.