Mill ScoverageModule confict with GenIdea

[romain-gilles-ultra]

Scoverage conflict with GenIdea

Config

Mill version 0.11.7

Issue

I found an issue/conflict when I used ScoverageModule. If I add Scoverage to my project then the idea integration produces faulty configuration. When I add Scoverage, by following the documentation: https://mill-build.com/mill/contrib/scoverage.html, the dependency between the test module and its parent module disappears :( I was able to reproduce it with the 1-simple-scala example. Here is the modified version:

import $ivy.`com.lihaoyi::mill-contrib-scoverage:$MILL_VERSION`
import mill._, scalalib._
import mill.contrib.scoverage.ScoverageModule

object foo extends RootModule with ScalaModule with ScoverageModule {
  def scalaVersion = "2.13.13"
  def scoverageVersion = "2.1.0"
  def ivyDeps = Agg(
    ivy"com.lihaoyi::scalatags:0.12.0",
    ivy"com.lihaoyi::mainargs:0.6.2"
  )

  object test extends ScoverageTests with ScalaTests {
    def ivyDeps = Agg(ivy"com.lihaoyi::utest:0.7.11")
    def testFramework = "utest.runner.Framework"
  }
}

After executing mill mill.idea.GenIdea/idea you wont find the module decalaration to the root module in the .idea/mill_modules/test.iml

<module type="JAVA_MODULE" version="4">
    <component name="NewModuleRootManager">
        <output-test url="file://$MODULE_DIR$/../../out/test/ideaCompileOutput.dest/classes"/>
        <exclude-output/>
        <content url="file://$MODULE_DIR$/../../test">
            <sourceFolder url="file://$MODULE_DIR$/../../test/src" isTestSource="true"/>
            <sourceFolder url="file://$MODULE_DIR$/../../test/resources" type="java-test-resource"/>
        </content>
        <orderEntry type="inheritedJdk"/>
        <orderEntry type="sourceFolder" forTests="false"/>
        <orderEntry type="library" name="geny_2.13-1.0.0.jar" level="project"/>
        <orderEntry type="library" name="mainargs_2.13-0.6.2.jar" level="project"/>
        <orderEntry type="library" name="portable-scala-reflect_2.13-0.1.1.jar" level="project"/>
        <orderEntry type="library" name="scala-collection-compat_2.13-2.8.1.jar" level="project"/>
        <orderEntry type="library" name="scala-library-2.13.13.jar" level="project"/>
        <orderEntry type="library" name="scala-reflect-2.13.13.jar" level="project"/>
        <orderEntry type="library" name="scalac-scoverage-runtime_2.13-2.1.0.jar" level="project"/>
        <orderEntry type="library" name="scalatags_2.13-0.12.0.jar" level="project"/>
        <orderEntry type="library" name="sourcecode_2.13-0.3.0.jar" level="project"/>
        <orderEntry type="library" name="test-interface-1.0.jar" level="project"/>
        <orderEntry type="library" name="utest_2.13-0.7.11.jar" level="project"/>
    </component>
</module>

The original version of the example produces:

<module type="JAVA_MODULE" version="4">
    <component name="NewModuleRootManager">
        <output-test url="file://$MODULE_DIR$/../../out/test/ideaCompileOutput.dest/classes"/>
        <exclude-output/>
        <content url="file://$MODULE_DIR$/../../test">
            <sourceFolder url="file://$MODULE_DIR$/../../test/src" isTestSource="true"/>
            <sourceFolder url="file://$MODULE_DIR$/../../test/resources" type="java-test-resource"/>
        </content>
        <orderEntry type="inheritedJdk"/>
        <orderEntry type="sourceFolder" forTests="false"/>
        <orderEntry type="library" name="geny_2.13-1.0.0.jar" level="project"/>
        <orderEntry type="library" name="mainargs_2.13-0.6.2.jar" level="project"/>
        <orderEntry type="library" name="portable-scala-reflect_2.13-0.1.1.jar" level="project"/>
        <orderEntry type="library" name="scala-collection-compat_2.13-2.8.1.jar" level="project"/>
        <orderEntry type="library" name="scala-library-2.13.11.jar" level="project"/>
        <orderEntry type="library" name="scala-reflect-2.13.11.jar" level="project"/>
        <orderEntry type="library" name="scalatags_2.13-0.12.0.jar" level="project"/>
        <orderEntry type="library" name="sourcecode_2.13-0.3.0.jar" level="project"/>
        <orderEntry type="library" name="test-interface-1.0.jar" level="project"/>
        <orderEntry type="library" name="utest_2.13-0.7.11.jar" level="project"/>
        <orderEntry type="module" module-name="" exported=""/>
    </component>
</module>

After applying the scoverage configuration this line is missing:

<orderEntry type="module" module-name="" exported=""/>

Reproduction

You can find the reproduction in the following repository: https://github.com/romain-gilles-ultra/mill-scoverage-idea

[romain-gilles-ultra]

A remark: If you change the Mill version to 0.11.6 in the .mill-version file then the issue is no longer there

[lefou]

Thank you for reporting it.

I think it might be related to this change, which was released in Mill 0.11.7.

• https://github.com/com-lihaoyi/mill/pull/2989

The idea behind the change was, that we don't want to see each scoverage module twice, esp. as IDEA isn't very great at navigating sources which belong to more than one module.

But since scoverage tests don't depend on the outer module but the outer.scoverage modules, which contains the enhanced classfiles, but is is no longer visible to IDEA, we miss it completely.

[lefou]

Here is a workaround:

--- a/build.sc
+++ b/build.sc
@@ -11,6 +11,10 @@
     ivy"com.lihaoyi::mainargs:0.6.2"
   )

+  override lazy val scoverage: ScoverageData = new ScoverageData {
+    def skipIdea = false // or foo.skipIdea
+  }
+
   object test extends ScoverageTests with ScalaTests {
     def ivyDeps = Agg(ivy"com.lihaoyi::utest:0.7.11")
     def testFramework = "utest.runner.Framework"