JUnit is a unit testing framework for the Java programming language. JUnit has been important in the development of test-driven development, and is one of a family of unit testing frameworks collectively known as xUnit that originated with SUnit.

JUnit is linked as a JAR at compile-time; the framework resides under packages junit.framework for JUnit 3.8 and earlier and under org.junit for JUnit 4 and later.

Example of JUnit test fixture [link]

A JUnit Test fixture is a Java object. With older versions of JUnit, fixtures had to inherit from junit.framework.TestCase, but new tests using JUnit 4 should not do this.^[2] Test methods must be annotated by the @Test annotation. If the situation requires it,^[3] it is also possible to define a method to execute before (or after) each (or all) of the test methods with the @Before (or @After) and @BeforeClass (or @AfterClass) annotations.^[4]

<source lang="java"> import org.junit.*;

public class TestFoobar{

   @BeforeClass
   public static void setUpClass() throws Exception {
       // Code executed before the first test method       
   }

   @Before
   public void setUp() throws Exception {
       // Code executed before each test    
   }

   @Test
   public void testOneThing() {
       // Code that tests one thing
   }

   @Test
   public void testAnotherThing() {
       // Code that tests another thing
   }

   @Test
   public void testSomethingElse() {
       // Code that tests something else
   }
   @After
   public void tearDown() throws Exception {
       // Code executed after each test   
   }

   @AfterClass
   public static void tearDownClass() throws Exception {
       // Code executed after the last test method 
   }

} </source>

Ports [link]

JUnit has been ported to other languages including:

• Actionscript (FlexUnit)
• Ada (AUnit)
• C (CUnit)
• C# (NUnit)
• C++ (CPPUnit)
• Fortran (fUnit)
• Delphi (DUnit)
• Free Pascal (FPCUnit)
• JavaScript (JSUnit)
• Objective-C (OCUnit)
• Perl (Test::Class and Test::Unit)
• PHP (PHPUnit)
• Python (PyUnit)
• R (RUnit)
• Haskell (HUnit)
• Qt (QTestLib)

See also [link]

• Mock object
• TestNG, an alternative to JUnit
• List of unit testing frameworks
• Test fixture
• Mockito and PowerMock, mocking extensions to JUnit

	Software Testing portal
	Free software portal

References [link]

External links [link]

• JUnit home page
• JUnit antipatterns (developerWorks) and JUnit antipatterns (Exubero)
• An early look at JUnit 4
• JUnit Presentation