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https://issues.apache.org/jira/browse/SUREFIRE-1792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17108717#comment-17108717
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Tibor Digana commented on SUREFIRE-1792:
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Maybe some hints:
It is also worth to segregate test utilities in a separate Git project with a
separate ownership, development life cycle, build process and deployment.
The example in {{maven-compiler-plugin}} should be written other way.
Some companies say that "we want to test entire module structure". They create
separate modules in the *flat structure* for these testing purposes. (need to
suppress deployment)
And some other companies use {{maven-invoker-plugin}} which supports nested
module(s) in *hierarchical structure*.
Some OSS project like the Maven has the third principle calling the [IT
project|https://github.com/apache/maven-integration-testing] from [Maven
project|https://github.com/apache/maven], see
[Jenkinsfile|https://github.com/apache/maven/blob/master/Jenkinsfile] in the
Maven project.
Altogether these are three way but i would never recommend sharing test Jar
file.
> Reusable dependency tests
> -------------------------
>
> Key: SUREFIRE-1792
> URL: https://issues.apache.org/jira/browse/SUREFIRE-1792
> Project: Maven Surefire
> Issue Type: Bug
> Components: Maven Surefire Plugin
> Affects Versions: 3.0.0-M3
> Environment: Windows 10 home
> Maven 3.6.3 (w/ wrapper)
> Adopt OpenJDK 11(11.0.4-hotspot)
> Reporter: Mantas Gridinas
> Assignee: Tibor Digana
> Priority: Major
> Attachments: 2020-05-13T23-49-29_619-jvmRun1.dump,
> 2020-05-13T23-49-29_619.dumpstream
>
>
> Hi!
> I read that you can do attached tests by installing the test-jar (from
> http://maven.apache.org/guides/mini/guide-attached-tests.html) and then using
> dependenciesToScan configuration option to scan the test-jar dependency for
> tests and run them. This gave me an idea of providing a test jar that I could
> test implementation of my interfaces without having to write repeated tests
> for them (I load the implementations via ServiceLoader mechanism) . I've got
> a project for that at https://gitlab.com/Dragas/eternal-witness. Mind you the
> project does use project jigsaw features.
> While experimenting, I ended up extracting the "api" tests into its own
> module, but the issue continues to remain.
> Trying this approach I seem to observe an interesting behavior. Surefire
> plugin does indeed find that there are PlayerServiceTest and DeckServiceTest
> files on the dependency graph, but it fails to load them for some reason.
> Perhaps it does not patch the test module with the dependency module? I have
> attached the JVM dumpstreams from my experimenting.
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