Custom lint rules ignored for :library module

[mosofsky]

When I tried moving the Test.kt file from the :app module to the :library module, lint stopped reporting the expected warning.

Steps to reproduce:

1. git clone https://github.com/googlesamples/android-custom-lint-rules.git
2. cd android-custom-lint-rules
3. Move Test.kt to library module:
   1. mkdir -p library/src/main/java/com/example/lint/library
   2. mv app/src/main/java/com/android/example/Test.kt library/src/main/java/com/example/lint/library
   3. sed -i '' 's/com.android.example/com.example.lint.library/' library/src/main/java/com/example/lint/library/Test.kt
4. Run either of these lint commands:
   1. ./gradlew :library:lint
   2. ./gradlew lint
5. Expected "Warning: This code mentions lint: Congratulations [SampleId]" but got none

This may be related to Custom lint checks stopped running for multi-module Android project after upgrading to Android Gradle Plugin 4.2.2

[andrefrsousa]

We have a similar problem in a multi module project. Basically in the non-android modules we are unable to run our custom lints. @tnorbye there a way to fix it?