Introduction Continued

Installation of JUnit 5

We shall discuss how to install JUnit5. JUnit5 will be studied later on. Unlike JUnit4 we cannot just download 2 jar files and make things work. We need to work with Maven and "pom.xml" . First install Maven. Maven is a build tool. The reason we need Maven is that it will automatically download all the needed jars. You can do so from the web site :

http://maven.apache.org/download.cgi

I downloaded the zip file and extracted it to my root folder to get the folder:

C:\apache-maven-3.6.3

Create a folder in "C:\JUnit" called "test2" .

Open a dos command session and type:

set path=c:\jdk18\bin;C:\apache-maven-3.6.3\bin;%path%

Now execute the below command:

mvn archetype:generate -DgroupId=com.mycompany.app -DartifactId=my-app -DarchetypeArtifactId=maven-archetype-quickstart -DarchetypeVersion=1.4 -DinteractiveMode=false

This will create a folder called "my-app" in our "test2" folder. The structure of this folder will look like:

C:\JUnit

test2/my-app

src

main

\java\com\mycompany\app

Calculator.java

test

\java\com\mycompany\app

CalculatorTest.java

pom.xml

Place the file "Calculator.java" in the source main folder.

Place the file "CalculatorTest.java" in the test folder. The file "pom.xml" should have entries of the form:

<properties>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

<maven.compiler.source>1.8</maven.compiler.source>

<maven.compiler.target>1.8</maven.compiler.target>

<java.version>1.8</java.version>

<junit-jupiter.version>5.5.2</junit-jupiter.version>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

</properties>

<dependencies>

<dependency>

<groupId>org.junit.jupiter</groupId>

<artifactId>junit-jupiter-engine</artifactId>

<version>${junit-jupiter.version}</version>

<scope>test</scope>

</dependency>

</dependencies>

Now from the "my-app" folder run the command:

C:\junit\test2\my-app>mvn test