Unit Testing Example with Code Coverage using Cobertura

Cobertura Coverage in NetBeans 7.4

I gave a presentation on unit testing a few months ago at Greenville Java Users Group (GreenJUG) about unit testing using JUnit and Cobertura. I finally have gotten around to publishing the code with a little cleanup.

NetBeans will detect the addition of Cobertura in the POM file and automatically add menu items for checking code coverage. This is a very slick feature in NetBeans.

The Cobertura coverage shows 90% in the project because it does not handle the generics correctly at this time.

The Apache Maven based project can be downloaded from Bitbucket below:

unit-testing-demo

Here is an example snippet of the code.

ListDataStoreImplTest.java

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package com.bluelotussoftware.junit;   import java.util.ArrayList; import java.util.List; import org.junit.Test; import static org.junit.Assert.*; import static org.mockito.Mockito.*;   /**  *  * @author John Yeary  * @version 1.0  */ public class ListDataStoreImplTest {       public ListDataStoreImplTest() {     }       @Test     public void testConstuctor() {         System.out.println("Constructor test");         List<string> list = new ArrayList<string>() {             private static final long serialVersionUID = 3109256773218160485L;               {                 add("Hello");                 add("World");             }         };           ListDataStore<string> instance = new ListDataStoreImpl(list);         assertEquals(list.get(0), instance.getData().get(0));         assertEquals(list.get(1), instance.getData().get(1));         assertEquals(list, instance.getData());         assertEquals(2, instance.getData().size());     }       @Test     public void objectTest() {         System.out.println("Generic Object test");         List list = new ArrayList() {             private static final long serialVersionUID = 3109256773218160485L;               {                 add("Hello");                 add("World");             }         };           ListDataStore instance = new ListDataStoreImpl(list);         assertEquals(list.get(0), instance.getData().get(0));         assertEquals(list.get(1), instance.getData().get(1));         assertEquals(list, instance.getData());         assertEquals(2, instance.getData().size());     }       /**      * Test of getData method, of class ListDataStoreImpl.      */     @Test     public void testGetData() {         // Check #1 - Check the new datastore.         System.out.println("getData");         ListDataStoreImpl instance = new ListDataStoreImpl();         List expResult = new ArrayList();         List result = instance.getData();         assertEquals(expResult, result);           // Check #2 - Check the list. Mockito is overkill, but works.         instance.add("ABC");         List l = mock(List.class);         when(l.get(0)).thenReturn("ABC");         assertEquals(l.get(0), instance.getData().get(0));           // Check #3 - Check to make sure that the list size is correct.         assertEquals(1, instance.getData().size());     }       /**      * Test of add method, of class ListDataStoreImpl.      */     @Test     public void testAdd() {         System.out.println("add");         String element = "ABC";         ListDataStoreImpl instance = new ListDataStoreImpl();         boolean expResult = true;         boolean result = instance.add(element);         assertEquals(expResult, result);     }       /**      * Test of remove method, of class ListDataStoreImpl.      */     @Test     public void testRemoveEmpty() {         System.out.println("remove");         String element = "ABC";         ListDataStoreImpl instance = new ListDataStoreImpl();         boolean expResult = false;         boolean result = instance.remove(element);         assertEquals(expResult, result);     }       @Test     public void testRemove() {         System.out.println("remove");         String element = "ABC";         ListDataStoreImpl instance = new ListDataStoreImpl();         instance.add(element);         boolean expResult = true;         boolean result = instance.remove(element);         assertEquals(expResult, result);     } }