Cannot use JUNIT Testing on VSCode

Question

Hello Everyone

Im new to Java and VSCode and im trying to use JUNIT for my current classes on Java, but im not able to use JUnit. I have installed all the official extensions (The Java extensions, and the java extension pack), and I run this guide here:

https://code.visualstudio.com/docs/java/java-testing

But I still have the same issues. I created a very simple test file:

Java File:

public class Greet {

    public String says() {

        return "Hello";

    }

}

public class Greet {

    public String says() {

        return "Hello";

    }

}
```Test File:

```java
import org.junit.

*

;

public class GreetTest {

    @Test

    public void test() {

        Greet gre = new Greet();

    }

}





import org.junit.*;

public class GreetTest {

    @Test

    public void test() {

        Greet gre = new Greet();

    }

}
```But it always creates the same two issues: "org.junit Package does not exist" is the error i receive in the code and when I switch to the Test-Tab it does not show me the Test-File to run the test-file with.

What am I missing here? I also found this post, but that did not help: [https://stackoverflow.com/questions/56244560/vscode-not-finding-unit-tests](https://stackoverflow.com/questions/56244560/vscode-not-finding-unit-tests) 

  

Thank you for your help.

  

Cheers, 

  

Gabe

Answer 1

Hello @Gabriel ,

Can you confirm that you have clicked the Testing option on the left => click Enable Java Tests => and select to install JUnit?

I believe that you have followed the document to install the JUnit, then the "hamcrest-core-1.3.jar" and the "junit-4.13.2.jar" should be installed.

If the issue persists, please try to follow/check the following complete steps:

1. Install VS Code, Extension Pack for Java, and choose to install JDK after the extension finishes installing.
2. Create a new empty folder, create a sub folder in this new folder and name it src. Put the .java files into the src folder.

3. Launch VS Code, File, Open Folder, then open that new folder.

4. Click to open the GreetTest.java file and wait for the Testing option appears. Once the Testing option appears, click it, click Enable Java Tests, select JUnit, click the button to run the test.

If you follow the above steps, but the error persists, please try to reinstall VS Code, reinstall JDK(uninstall it from Control Panel), and reinstall the extension then test again.

Best Regards,

Tianyu

---

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Answer 2

Hello Tianyu

I unfortunately still receive the same error message after the reinstallation:

And yes, both java files are being created:

KInd regards,

Gabriel

Answer 3

Your java-extension doesn't know your jar packages even if they lie in your project. Expected behavior is like:

Under "JAVA PROJECTS" > "Referenced Libraries", there are jar packages (ignore gurobi-12.0.1.jar, that is my personal-purpose jar).

Conventionally, java-extension (actually extension "Project Manager for Java") know where your jar packages are by folder name "lib", so try rename your "test-lib" to "lib". If it doesn't work, you can manage the dependencies by clicking the "+" icon or the "-" icon on the "Referenced Libraries" node, or you can just directly drag your jar libraries to the node "Referenced Libraries". For more information: dependencies-for-unmanaged-folder.