IssueTracker

Developers can generate unit test coverage report and device test coverage report. At the moment, these two are separate reports.

In order to generate a single report, developers write their own build logic (https://github.com/android/nowinandroid/blob/8bf51cfae361ed8d82500d0f63890662a8e7a28c/build-logic/convention/src/main/kotlin/com/google/samples/apps/nowinandroid/Jacoco.kt#L51). E.g.:

androidComponentsExtension.onVariants { variant ->
        val jvmTestTaskName = "test${variant.name.capitalize()}UnitTest"
        val androidTestTaskName = "connected${variant.name.capitalize()}AndroidTest"
        val buildDir = layout.buildDirectory.get().asFile
        listOf(jvmTestTaskName, androidTestTaskName).forEach { testTaskName ->
            val reportTask =
                tasks.register("jacoco${testTaskName.capitalize()}Report", JacocoReport::class) {
                    dependsOn(testTaskName)

                    reports {
                        xml.required.set(true)
                        html.required.set(true)
                    }

                    classDirectories.setFrom(
                        // TODO: Hack suggested in https://issuetracker.google.com/161300933
//                        fileTree("$buildDir/tmp/kotlin-classes/${variant.name}") {
//                            exclude(coverageExclusions)
//                        }

                        fileTree("$buildDir/intermediates/classes/${variant.name}/transform${variant.name.capitalize()}ClassesWithAsm/dirs") {
                            exclude(coverageExclusions)
                        }
                    )

                    sourceDirectories.setFrom(
                        files(
                            "$projectDir/src/main/java",
                            "$projectDir/src/main/kotlin"
                        )
                    )

                    executionData.setFrom(
                        file("$buildDir/jacoco/$testTaskName.exec"),
                        file("$buildDir/**/coverage.ec"),
                        // Beware of using '**' with directories that contain spaces!
                        project.fileTree("$buildDir/outputs/code_coverage")
                            .matching { include("**/*.ec") }
                    )
                }

            jacocoTestReport.dependsOn(reportTask)
        }
    }