JUnit was developed by Kent Beck and Erich Gamma. Its first version was released in 1997.
JUnit 5 = JUnit Platform + JUnit Jupiter + JUnit Vintage
— https://junit.org/junit5/docs/current/user-guide/
It is powerful testing framework, with many modules. These modules are part of three sub-projects
- Junit Platform: Serves as a foundation for launching testing frameworks on the JVM.
- Junit Jupiter: It is the combination of the new programming model and extension model for writing tests and extensions in JUnit 5.
- Junit Vintage: Provides a
TestEnginefor running JUnit 3 and JUnit 4 based tests on the platform.
Let’s start a basic project structure
mvn archetype:generate -DgroupId=samarthya.me -DartifactId=learnunit -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=true
In previous
JUnit versions, there was limited/no support to allow parameters in test constructors or methods. One of the major changes in JUnit 5 Jupiter was that both test constructors and test methods are now allowed to have parameters.POM: JUNIT4 Support#
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>samarthya.me</groupId>
<artifactId>learnunit</artifactId>
<packaging>jar</packaging>
<version>v1.0</version>
<name>learnunit</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>Adding Libraries : JUNIT5#
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>samarthya.me</groupId>
<artifactId>learnunit</artifactId>
<packaging>jar</packaging>
<version>v1.0</version>
<name>learnunit</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>5.7.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>5.7.2</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.junit.vintage/junit-vintage-engine -->
<dependency>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
<version>5.7.2</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>JUNIT#
JUNIT4: Test#
package samarthya.me;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
/**
* Unit test for simple App.
*/
public class AppTest
extends TestCase
{
/**
* Create the test case
*
* @param testName name of the test case
*/
public AppTest( String testName )
{
super( testName );
}
/**
* @return the suite of tests being tested
*/
public static Test suite()
{
return new TestSuite( AppTest.class );
}
/**
* Rigourous Test :-)
*/
public void testApp()
{
System.out.println("JUNIT4: Test");
assertTrue( true );
}
}JUNIT5: Test case#
I will be using the @Test annotation that is from the package org.junit.jupiter.api.
package samarthya.me;
import static org.junit.Assert.assertTrue;
import org.junit.jupiter.api.Test;
class AppTest5 {
@Test
void test() {
System.out.println("JUNIT5: Test");
assertTrue(true);
}
}Not much is there, but you can execute the suite and see the output. I am using Visual Studio Code and launching test gives the result as below.
You can try some failures as below too..
SampleFunction#
A trivial class with one sample function willReturnOne() that return one.
package samarthya.me;
public class SampleFunctions {
public int willReturnOne() {
return 1;
}
}
