Receive FileAlreadyExistsException with multi-module-projects structure

[tanyagorn]

Summary

I know that to run stryker on multi-module-projects, I need to use command sbt project projectName; stryker to run each module separately. However I have a repository with structure like this ...

sbt-multi-project-example/
    - common/
        - src/
             - main/
             - test/
    - multi1/
        - src/
             - main/
             - test/
    - multi2/
        - src/
            - main/
            - test/
    - project/
        - build.properties
        - plugins.sbt
    - src/
        - main/
        - test/
    - build.sbt

common, multi1, multi2 are sub-modules project in which I can run stryker with command like sbt project common; stryker without any problem.
However, my goal is to run stryker on src directory. Please notice that it doesn't have parent directory like others, so to run stryker on it I use command like sbt stryker but Stryker always give me this error

sbt:sbt-multi-project-example> stryker
[info] Attempting to read config from stryker4s.conf
[info] Found 1 file(s) to be mutated.
[info] 2 Mutant(s) generated.()
[info] Setting up mutated environment...
[error] stack trace is suppressed; run last stryker for the full output
[error] (stryker) fs2.CompositeFailure: Multiple exceptions were thrown (2), first java.nio.file.FileAlreadyExistsException: /Users/tbenjaprompa/Documents/GitHub/sbt-multi-project-example/common/target/src/main/scala/Model.scala
[error] Total time: 2 s, completed Nov 17, 2021 7:30:56 PM

You can checkout my repository to try out here https://github.com/tanyagorn/sbt-multi-project-example
I know that the structure is kinda weird... but I have multiple project with structure like this and it give me a headache. Any suggestion or is it possible to run stryker on this?

Stryker4s config

stryker4s {
    base-dir: "."
    mutate: [
        "src/main/scala/*.scala"
    ]
}

Stryker4s environment

stryker4s 0.14.1

Your Environment

software	version(s)
Scala version	2.12.3
Build tool & version	Intellij Idea community 2021.1.3 (community edition)
Operating System	macOS

[hugo-vrijswijk]

Hi! Thanks for creating this issue. I think this is a bug in Stryker4s. I can reproduce the example repo. Removing base-dir: "." from the config fixes the exception thrown. The current working directory is already the default when running Stryker4s and leaving base-dir empty.

I'll look into why this is thrown. I'm not certain if it is related to your original issue on your project