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JUnit Setup

Open the JUnit Demo and download the files into a folder named junitDemo. The test will pass because there is nothing in it. You should complete the TODO sections.

General IDE (Terminal)

  1. Open the folder junitDemo

  2. You will notice that there is a lib folder with jar files, those are important for JUnit

  3. Under the junitDemo folder, run these commands:

    • Mac Users:

      • Compile: javac -cp libs/junit-4.13.2.jar:libs/hamcrest-core-1.3.jar:. DemoArrayImplTester.java
      • Execute: java -cp libs/junit-4.13.2.jar:libs/hamcrest-core-1.3.jar:. org.junit.runner.JUnitCore DemoArrayImplTester

    • Windows Users:

      • Compile: javac -cp ".;libs\junit-4.12.jar;libs\hamcrest-core-1.3.jar" DemoArrayImplTester.java
      • Execute: java -cp ".;libs\junit-4.12.jar;libs\hamcrest-core-1.3.jar" org.junit.runner.JUnitCore DemoArrayImplTester

    • Command explanation:

      • javac: compiles the folder
      • libs/junit-4.13.2.jar:libs/hamcrest-core-1.3.jar:. JUnit4 dependencies
      • DemoArrayImplTester.java: the tester file we want to compile and run

VSCode Extension

  1. Open the folder junitDemo in VSCode. You might notice that there are some red errors.

  2. Open the tester file DemoArrayImplTester.java.

  3. On the left side of VSCode, there are ICONS, please click on the icon that looks like a beaker. If there is no beaker, please go to "Manage" - "Extensions", and install "Extension Pack for Java". This beaker will show up if you have the tester file DemoArrayImplTester.java open.

  4. Please Enable Java Test and select JUnit (NOT JUnit Jupiter).

  5. Then you will see the unit Tests if they pass or fail. All of them will pass but this image below is an idea of what should look like.