packaging jacoco-agent.properties into an APK so i

问题:

Here's my situation:

Background

• I am investigating code-coverage for our Android app. The app is built with Gradle and Android Studio.
• I need code-coverage reports in two situations: during manual tests, and during automated tests built with our sizeable Appium suite.
• I need to get a proof-of-concept out fast (isn't that always the case?) so I haven't had the chance to do thorough R&D. So please forgive any ignorance I display :)
• I have access to the app source, but have little knowledge of the moving parts.
• I have investigated JaCoCo and Emma. This question pertains to JaCoCo.
• Given that we need coverage for Appium and manual tests, I believe offline-instrumentation with JaCoCo is what I need.

Progress Made

• I used the JaCoCo plugin page and the Android Tools page and could configure build.gradle properly.
• I have verified that the classes (present in build\intermediates\classes) are instrumented with JaCoCo, and are packaged in the APK.
• I wrote a BroadCastReceiver per this SO discussion, which will receive the "end coverage" broadcast.

Problem

When I run the app manually, I keep seeing errors in the logcat W/System.err: java.io.FileNotFoundException: /jacoco.exec: open failed: EROFS (Read-only file system)

From this SO question and the JaCoCo docs I understand that Jacoco needs to know where to store the jacoco.exec file - and that I need to package a jacoco-agent.properties (containing a destfile property) with the APK.

I have tried putting jacoco-agent.properties in assets - it was packaged into the APK properly, but did not seem to have any effect (i.e Jacoco failed as usual) I tried putting it inside res - it did not get packaged into the APK. I tried res/raw and hit the error about a dash in the filename, as in this SO question.

I am at my wit's end, and would really appreciate help. How do I package jacoco-agent.properties using my Gradle build into the APK, so that JaCoCo will read it?

Related Questions

this SO question, has an answer from 2013, and it's for Ant, not Gradle.

回答1:

I'm not familiar with the requirement for executing Jacoco working, but you can package a file with the apk pretty easily. The below code will place the jacoco-agent.properties at the root of your apk package.

Make these changes to the build.gradle for your app module:

android {
    ...
    sourceSets {
        main {
            resources.includes = [ '**/jacoco-agent.properties' ]
        }       
    }
}