I have a multi module project, an application module app and a library module testShared. The testShared library has common test code for running unit and instrumentation tests.

I've defined my debug buildTypes as:

buildTypes {
    debug {
        enableUnitTestCoverage = true
        enableAndroidTestCoverage = true
    }

And referenced the testShared module in app's build.gradle.kts like this so that the unit and instrumentation tests in app can both use the shared code in testShared:

androidTestImplementation(project(":testShared"))

When testDebugUnitTest is run, I see a testDebugUnitTest.exec file created. When I run connectedDebugAndroidTest, I do see a coverage.ec file also get created. When I generate a code coverage report using Jacoco, I'll see coverage from the unit tests, but not the instrumentation tests. Examining the coverage.ec file notes there is no references to any of the source files, so the issue is not in the generating the report, but in the coverage.ec generated while running the instrumentation tests.

Investigation

Prior to AGP 8.3, code coverage did work (most recently tested with AGP 8.2.2), with a caveat in in AGP 8+, the following needs to be added to build.gradle.kts:

tasks.withType<Test> {
    extensions.configure(JacocoTaskExtension::class) {
        excludes = listOf("*")
    }
}

which works around a Caused by: java.lang.IllegalStateException: Cannot process instrumented class <class>. Please supply original non-instrumented classes. issue that is documented in https://issuetracker.google.com/issues/178015739#comment6.

This workaround must be removed with AGP 8.3, as testDebugUnitTest will generate no unit test code coverage.

In AGP 8.3+, I found that if I removed the androidTestImplementation(project(...)) reference, coverage would work fine. This isn't an option, as the whole point of the library is to provide common code.

Steps to Reproduce:

1. Download the sample KotlinDslTestApp.zip project attached to this issue.
2. Run gradlew clean testDebugUnitTest
3. Run gradlew connectedDebugAndroidTest
4. 5. Run gradlew testDebugUnitTestCoverage and examine the coverage in build/reports/coverage/html/com.foo.kotlindsltestapp/index.html.

Attached the debug output of connectedDebugAndroidTest and a sample coverage.ec from this run.

IMPORTANT: Please read https://developer.android.com/studio/report-bugs.html carefully and supply all required information.

Studio Build:

• Version of Gradle Plugin: 8.3.1
• Version of Gradle: 8.7
• Version of Java: 17.0.10
• OS: Windows 10