Migrating specific tests from JUnit 4 to JUnit 5 in IntelliJ

Question

I am trying to migrate test files from Junit 4 to Junit 5 using IntelliJ refactor code -> migrate -> junit 4 to junit 5.

But it only run import optimization and show all unit tests in the project and ask yes or no on refactoring and nothing happens when I chose do refactor.

any one know on another migration tool / plug in or a way to make the migration work ?

What's you version of IDEA? You can try to download EAP (the cutting edge version) https://www.jetbrains.com/idea/nextversion/ and do the migration there. — Admit, Oct 30 '17 at 12:50
You might find this tool useful: https://github.com/boyarsky/convert-junit4-to-junit5 — Sam Brannen, Oct 30 '17 at 16:05
Also, seems like the IntelliJIDEA feature is not very ready either => https://youtrack.jetbrains.com/issue/IDEA-179927 — Naman, Oct 31 '17 at 09:50
@SamBrannen You should write your link as an answer, so that Ran can accept it. — Marcelo Glasberg, Oct 31 '17 at 21:31
Glad you find that converter useful. I'll post it as an answer now. — Sam Brannen, Nov 01 '17 at 12:48

score 10 · Answer 1 · answered Nov 01 '17 at 12:50

10

Jeanne Boyarsky created a tool to convert JUnit 4 based tests to JUnit Jupiter.

You can find it in her GitHub account: https://github.com/boyarsky/convert-junit4-to-junit5

answered Nov 01 '17 at 12:50

Sam Brannen

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See also the brilliant built-in Error Prone refactorings to migrate ExpectedExceptions and other exception-testing idioms to `assertThrows`, a rather tedious task if done manually: https://stackoverflow.com/a/51847402/1792188 – Dmitry Timofeev Aug 15 '18 at 18:11

score 5 · Answer 2 · answered Oct 27 '22 at 15:58

Use openrewrite:

mvn org.openrewrite.maven:rewrite-maven-plugin:4.36.0:run -Drewrite.recipeArtifactCoordinates=org.openrewrite.recipe:rewrite-testing-frameworks:1.28.0 -Drewrite.activeRecipes=org.openrewrite.java.testing.junit5.JUnit5BestPractices

which migrates automatically from JUnit 4 to JUnit 5 without modifying your code style.

score 2 · Answer 3 · answered Nov 01 '17 at 12:11

It seems that converting test from JUnit 4 to JUnit 5 in IntelliJ 2017.3 is not complete. As suggested by Sam Brannen there is a small application on Github called convert-junit4-to-junit5 that can do the job.

Just clone the Github repo and build the software using Maven mvn clean package. Then run the the application using

java -jar \
     <path-to-your-cloned-repo>/convert-junit4-to-junit5/target/convert-junit4-to-to-junit5-0.0.1-SNAPSHOT.jar \
     <path to where your JUnit 4 tests are located>

For further instruction please read the projects documentation.

no main manifest attribute, in target/convert-junit4-to-to-junit5-0.0.1-SNAPSHOT.jar — Martin Schröder, Dec 04 '17 at 12:39

Migrating specific tests from JUnit 4 to JUnit 5 in IntelliJ

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