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  • JUnit

    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 package junit.framework for JUnit 3.8 and earlier, and under package org.junit for JUnit 4 and later.

    A research survey performed in 2013 across 10,000 Java projects hosted on GitHub found that JUnit in a tie with slf4j-api, was the most commonly included external library. Each library was used by 30.7% of projects.

    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 FoobarTest {
        public static void setUpClass throws Exception {
            // Code executed before the first test method
        public void setUp throws Exception {
            // Code executed before each test
        public void testOneThing {
            // Code that tests one thing
        public void testAnotherThing {
            // Code that tests another thing
        public void testSomethingElse {
            // Code that tests something else
        public void tearDown throws Exception {
            // Code executed after each test 
        public static void tearDownClass throws Exception {
            // Code executed after the last test method 


    JUnit alternatives have been written in other languages including: