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https://issues.apache.org/jira/browse/MNG-6442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16591523#comment-16591523
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Robert Scholte commented on MNG-6442:
-------------------------------------
I agree that the CI server is the preferred solution here. But did you try to
create a new project without main sourcefiles, only with the tests? Add a
dependency to the jar you want to test and run {{mvn verify}}?
> Run tests with Maven on pre-compiled project
> --------------------------------------------
>
> Key: MNG-6442
> URL: https://issues.apache.org/jira/browse/MNG-6442
> Project: Maven
> Issue Type: Wish
> Components: Artifacts and Repositories, Dependencies
> Affects Versions: 3.5.2
> Environment: Linux, Windows
> Reporter: Lasse Westh-Nielsen
> Priority: Minor
>
> Hello,
> This is not so much a bug as it is a support request. The mailing list link
> was out of order. Please do triage into the right category.
> I tried my luck on Stack Overflow
> (https://stackoverflow.com/questions/51079816/run-tests-with-maven-on-pre-compiled-project),
> but got nothing, and I really need some direction.
> Here is what I wrote on SO:
> _Using Maven, I want to run unit and integration tests on a pre-compiled/
> pre-jar'ed multi-module project. I am finding this exceedingly difficult._
> _My business case is, I want to compile and jar up a multi-module Maven
> project in one place, and then have the unit test and integration tests run
> using different Java versions and on different operating systems, to check
> for compatibility. Let's just say \{Java 8, Java 10} x \{Ubuntu, Windows} to
> keep it simple._
> _The reason I want to compile and jar up in one pace is, I want to ensure
> that I run tests on the actual code getting shipped. If I re-compiled
> everywhere I fear I might introduce errors unwittingly._
> _One solution is to do {{mvn deploy -DaltDeploymentRepository=$mydir}} on
> Ubuntu to produce a compiled project tree and a directory full of jars; then
> zipping up the project tree and deploy directory and shipping them off to a
> Windows machine; and there running {{mvn surefire:test
> -Dmaven.repo.local=$mydir}} on the project tree._
> _That works but it is hella clumsy. Surefire seems to read the test classes
> in the project tree and use the classes in the same project + jar
> dependencies from the deployment repo to link against. A problem there is,
> with {{-Dmaven.repo.local}} Maven needs to download all 3rd party
> dependencies again because that repo only contains my project artifacts. So a
> solid solution, but not great._
> _Instead what I have been trying to do is, just use the compiled project
> tree:_
> * _If I just do {{mvn surefire:test}} I get problems resolving dependencies_
> * _I have tried {{mvn compile -Dmaven.main.skip surefire:test}} to fix
> dependency resolution, which seems to work - just not for test dependencies_
> * _I further tried {{mvn compile -Dmaven.main.skip test-compile
> -Dmaven.test.skip surefire:test}}, but for some reason that also does not
> work, the build again fails trying to resolve test dependencies._
> _Interestingly, it is not deterministic, the failures happen at different
> stages and sometimes not at all - I get the occasional green build!_
> _And now I am at my wits' end: I keep thinking this should be simple, and
> that I can't possible be the first person struggling with this simple
> problem._
> _It is opaque to me what happens with the reactor, when and how it triggers.
> The dependency graph must have been well-formed, or it couldn't compile. So
> why can I not get Maven to reproduce the same dependency graph for running
> tests?_
> Further to that:
> * I tried installing artifacts in cache using `mvn install:install`, that
> didn't work
> * I tried `mvn install` but was unable to get it to _not_ re-compile and
> re-jar my artifacts
> * I have tried simply copying files as a way to install my artifacts on
> machines
> Current status is, copying files manually to ~/.m2/repository is most
> promising, it seems to work on Linux. However, it does not work on Windows,
> I'm still trying to figure out why - line endings perhaps, the artifacts come
> from a Linux machine. The problem is artifact lookup.
> Anyway, going back to first principles: what's the recommended way to achieve
> _running tests with Maven on pre-compiled project_? I'm hoping someone has
> solved this before...
> Regards,
> Lasse
>
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