Rework kotlin class detection in AGP3 about android-junit5 HOT 7 CLOSED

Here's one: spekframework/spek#256 (comment). I don't think it's an IDE-specific patch, the JavaArtifact#additionalSourcesDir is probably used somehow in AGP3.

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I'm hesitant towards the idea to extend the scope of this plugin to IDE-specific patches, since I'm assuming that a similar workaround would have to be made for IDEA and Studio 2.x versions as well (judging from the linked source).

Could you link some of the issues caused by copying Kotlin output to intermediates? Thanks!

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Thanks! I'll investigate a little.

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Another point of concern in applying a patch like this inside the JUnit 5 plugin is the requirement to depend on a local installation of Android Studio. This would be a problem when it comes to our Travis CI builds, since we wouldn't have access to a $localAndroidStudio there.

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Do you really need the full installation? Is there a way to just pull in AGP3 dependencies?

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I was just going off the way you reach into the IDE's plugin dependencies to obtain the compileOnly code necessary to provide Spek support. Pretty cool actually! There are some internal APIs inside AGP3 which could theoretically allow somebody to register additional artifacts (by means of ExtraModelInfo), however I'd rather not touch those internals.

Meanwhile, it seems that the Kotlin integration into the IDE has been improved quite a bit in the most recent releases, so that they are detected properly even from the /tmp folders. Also, when working on Kotlin translation earlier, I stumbled upon an interesting fact about the legacy integration between Java and Kotlin. In fact, on projects using AGP2, the Kotlin plugin automatically performs the Copy task itself! This might also have been a cause for accidental duplication of classes. The next version of android-junit5 won't perform any copying on its own anymore, and instead collect its inputs from a new TestRootDirectoryProvider interface, which is contributed to from the Kotlin compilation tasks directly.

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Released in 1.0.20.

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