Migrating from JUnit 4/3 to JUnit 5 for testing

[krisstern]

What feature do you want to see added?

Currently the codebase uses JUnit 4 for testing. Would be ideal if the tests could be updated to use JUnit 5 for this plugin, in order to harness the latest features from Java 8 or later, such as the lambda functions, rendering the tests more powerful and easier to maintain.

More info about the major differences and benefits of migrating from JUnit 4 to JUnit 5 can be found for example in this blog post from Oracle.

Upstream changes

No response

[baruKreddy]

@krisstern I would like to work on this. is there any jira task created for this issue?

[krisstern]

Hi @baruKreddy! We are not currently using JIRA. You are welcome to start work on the issue.

[baruKreddy]

Thanks:) @krisstern

[baruKreddy]

@krisstern I can see https://github.com/jenkinsci/junit-plugin/blob/master/pom.xml the version is managed in parent still. So where should we go for a version change.

[krisstern]

The issue now is split into two parts:

1. Non-integration tests
2. Integration tests

[Urjaswi-2655]

Hi, @krisstern ,I would like to work on Migrating from JUnit 4 to JUnit 5 for Integration testing issue .
I have no prior experience in testing, but I would like to learn.
Pls help me to get started.
Before asking for help,I read this doc to understand Integration Testing ( https://www.javatpoint.com/integration-testing )
And read the document for major differences and benefits of migrating from JUnit 4 to JUnit 5(Although , I have not understood everything).
And went through issue #88 , and read the comments and changes .(Not understood, completely)

Please help,if possibe,Thanks.

[krisstern]

There is this book called "Junit in Action", 3rd edition that may be useful for this task. You can find free PDF copies on the internet or pay for a copy. They do have a chapter dealing migrating from Junit 4 to Junit 5 in particular. (I have access to it via my O'Reilly subscription.)

I think the book would be a good starter to begin on a PR to complete this issue.

[Urjaswi-2655]

Thanks, @krisstern I downloaded that book . (I will read it)

[krisstern]

HI @Urjaswi-2655 If you are looking for relevant Udemy courses there is a free one https://www.udemy.com/course/junit-quick-start-for-beginners-java-unit-testing/. But this does not dive deep into migration from Junit 4 to Junit 5. So naturally you should fall back on the book preferably.

[Urjaswi-2655]

Thanks @krisstern I will cover it now

[i-laird]

@Urjaswi-2655 How is this going?

[shamlymhd]

Hi @krisstern I would like to work on this issue. can I start work on this?

[krisstern]

Hi @shamlymhd Sure, I don't think anyone else is working on the issue at the moment

[priyadarshan85]

Is anyone working on this issue?

[krisstern]

No, don't think so

[priyadarshan85]

I see that the migration to Junit 5 is already done. Whats pending on this issue?

[krisstern]

It's not 100% completed yet, only partially done.

[priyadarshan85]

All test cases are not passing ? Is it? Because pom.xml shows the upgrade to latest junit 5 version. Running tests now

[priyadarshan85]

@krisstern Getting following error when I build the project:

Am I missing something here

[krisstern]

All test cases are not passing ? Is it? Because pom.xml shows the upgrade to latest junit 5 version. Running tests now

I think it is the codebase that needs upgrading, as supposedly the "integration" tests have not been updated to JUnit 5 according to some comments of a previoius contributor. The tests are all passing. I can build it locally with no issues.