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JUnit
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"Junit" redirects here. For the Egyptian goddess, see Iunit.
JUnit
Developer(s) Kent Beck, Erich Gamma, David Saff, Kris Vasudevan
Stable release
5.7.1 / February 4, 2021; 4 months ago[1]
Repository
github.com/junit-team/junit5.git
Edit this at Wikidata
Written in Java
Operating system Cross-platform
Type Unit testing tool
License Eclipse Public License 2.0[2] (relicensed previously)
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 latest version of the framework, JUnit 5, resides under package org.junit.jupiter. Previous versions JUnit 4 and JUnit 3 were under packages org.junit and junit.framework, respectively.

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.[3]


Contents
1 Example of JUnit test fixture
2 Previous versions of JUnit
3 See also
4 References
5 External links
Example of JUnit test fixture
A JUnit test fixture is a Java object. Test methods must be annotated by the @Test annotation. If the situation requires it,[4] it is also possible to define a method to execute before (or after) each (or all) of the test methods with the @BeforeEach (or @AfterEach) and @BeforeAll (or @AfterAll) annotations.[5]

import org.junit.jupiter.api.*;

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

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

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

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

@Test
public void somethingElse() {
// Code that tests something else
}

@AfterEach
public void tearDown() throws Exception {
// Code executed after each test
}

@AfterAll
public static void tearDownClass() throws Exception {
// Code executed after the last test method
}
}
Previous versions of JUnit
As a side effect of its wide use, previous versions of JUnit remain popular, with JUnit 4 having over a 100,000 usages by other software components on the Maven central repository.[6]

In JUnit 4, the annotations for test execution callbacks were @BeforeClass, @Before, @After, and @AfterClass, as opposed to JUnit 5's @BeforeAll, @BeforeEach, @AfterEach, and @AfterAll.[5]

In JUnit 3, test fixtures had to inherit from junit.framework.TestCase.[7] Also, test methods had to be prefixed with 'test'.[8]

See also
Free and open-source software portal
TestNG, another test framework for Java
Mock object, a technique used during unit testing
Mockito, a mocking library to assist in writing tests
EvoSuite, a tool to automatically generate JUnit tests
List of Java Frameworks
References
"JUnit Releases". github.com. Retrieved 2021-02-04.
"Change license to EPL v2.0". github.com. 7 September 2017. Retrieved 2021-02-04.
"We Analyzed 30,000 GitHub Projects – Here Are The Top 100 Libraries in Java, JS and Ruby".
Kent Beck. "Expensive Setup Smell". C2 Wiki. Retrieved 2011-11-28.
"Writing Tests". junit.org. Retrieved 2021-02-04.
"JUnit". mvnrepository.com. Retrieved 2021-02-04.
Kent Beck; Erich Gamma. "JUnit Cookbook". junit.sourceforge.net. Retrieved 2011-05-21.
Charles A. Sharp (August 2007). "Migrating from JUnit 3 to JUnit 4: Nothing But Good News". Object Computing, Inc. Retrieved 2021-02-04.
External links
Official website
JUnit Presentation
JUnit Tutorials
Categories: Cross-platform softwareExtreme programmingFree software programmed in Java (programming language)Java development toolsJava platformUnit testing frameworksSoftware using the Eclipse license