JUnit

Not to be confused with G-Unit.

"Junit" redirects here. For the Egyptian goddess, see Junit (goddess).

JUnit

Developer(s)	Kent Beck, Erich Gamma, David Saff, Mike Clark (University of Calgary)
Stable release	4.11 / November 14, 2012 (2012-11-14)
Written in	Java
Operating system	Cross-platform
Type	Unit testing tool
License	Common Public License
Website	junit.org

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 which is 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

A JUnit test fixture is a Java object. With older versions of JUnit, fixtures had to inherit from junit.framework.TestCase, but the new tests using JUnit 4 should not do this. Test methods must be annotated by the @Test annotation. If the situation requires it, 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.

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 
    }
}

Ports

JUnit alternatives have been written in other languages including:

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

See also

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

External links

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