This is a simple white-box testing using junit tools.

Disclaimer: This testing is for educational purposes and not designated for production. The code and test cases may contain bugs.

• Java SE
• Junit
• Maven

• IDE (Preferably IntelliJ. Download IDE.)
• Maven setup (IntelliJ setup)

I assume that the IDE being used is IntelliJ Idea.

This java project is built using Maven. Read more about Maven here.
I already included the necessary configurations for this testing project inside pom.xml.

• Clone the repository - git clone https://github.com/YU88John/whitebox-junit.git

• Install necessary junit packages - mvn clean install
  

• Compile the source file - javac Utils.java

  Note: The JDK used for Maven is JDK 17. If any error comes up, ensure you have the same JDK version.

  • Check your JDK version - java -version
  • If it's different, install JDK 17 - sudo apt-get update and sudo apt install openjdk-17-jdk
  • (or) Not recommended but you can change pom.xml - <maven.compiler.source>17</maven.compiler.source> replace 17 with your JDK version.
    
    

• Right click on UtilsTest.java > Run 'UtilsTest'

  • testSumFile() is written to be failed intentionally.