Hey there :wave: I work on an Android project that contains custom lint rules. The lint module cont...

# android

[Severiano Jaramillo]

Hey there 👋

I work on an Android project that contains custom lint rules. The lint module contains the below dependencies block:

dependencies {
    compileOnly("com.android.tools.lint:lint-api:lint-version")
    compileOnly("com.android.tools.lint:lint-checks:lint-version")
    testImplementation("com.android.tools.lint:lint-tests:lint-version")
    testImplementation(libs.kotlin.test.junit)
}

It uses Gradle version catalogs, but it is probably obvious which dependencies it is referring to. I am in the process of migrating from Kotlin 1.8.21 to 1.9.10 and all of a sudden the custom lint tests started failing with errors like this:

Cannot access class 'com.android.tools.lint.detector.api.Issue'. Check your module classpath for missing or conflicting dependencies

Basically, unit tests cannot resolve dependencies that are configured with compileOnly. That used to work before migrating to Kotlin 1.9+. I found a way to fix the problem by adding the below configuration block:

configurations {
    // Give tests visibility into dependencies configured as compileOnly
    testImplementation.extendsFrom(compileOnly)
}

Does anyone know why Kotlin 1.9+ would cause this issue? Is my configurations block the correct way to solve it?

Thanks!

[agrosner]

I’m pretty sure you should be using the lintChecks configuration instead

[agrosner]

Our project does that

[agrosner]

Not sure if you need compile only

[Severiano Jaramillo]

The lint module is depended on using lingChecks

[agrosner]

Ah my bad

[agrosner]

We’re on kotlin 1.9 , agp 8.0, gradle 8.0, and have a custom lint project too that depend similarly as you

[Severiano Jaramillo]

Ah cool, even the NowInAndroid app has a similar setup, but it does not have unit tests for the custom lint rules.

[Severiano Jaramillo]

The lint rules work fine for us with Kotlin 1.9, Gradle and AGP 8+. The problem is just the unit tests for the custom lint rules.

[agrosner]

Oh the wording made it sounded like unit tests in general were failing. You mean the unit tests for the lint checks themselves

[Severiano Jaramillo]

Exactly, sorry for the confusion

[Chrimaeon]

maybe check out my project, it has tests for the lints. https://github.com/chrimaeon/lint-logdebug

[Chrimaeon]

also this might help. https://github.com/googlesamples/android-custom-lint-rules

[Colton Idle]

Are you using k2 compiler?

[Severiano Jaramillo]

I will check those out @Chrimaeon, thanks!
@Colton Idle nope, not using K2 yet.

[Severiano Jaramillo]

Thanks for sharing those repos @Chrimaeon! I was missing the testImplementation("com.android.tools.lint:lint:lint-version") dependency.

I wonder why that only became a problem when I migrated to Kotlin 1.9+ and not before 🤔