如何在Android中自定义Jacoco for Espresso测试

Question

I have a library project with some weird configuration between modules. Due to some specific restrictions, I have now 3 module: core (main module), core-test (where my unit tests are) and a core-app (where my Espresso tests are).

At this time, I need to generate a coverage report to make it available on out CI server. Using properties such additionalSourceDirs and additionalClassDirs , I created a custom task for enabling the core classes to be shown in the resulting jacoco.exec file. But for the Espresso tests, I am not able to find a way to customize this, as the jacoco configuration node on Android Gradle plugin seems to have no options for anything . Enabling testCoverageEnabled for a specific build configuration works, it generates the coverage, but only for the classes in core-app (I know, in a regular project, this is the expected behavior), so the coverage.ec file doesn't have the execution data for my other classes.

Anyone knows a way to add more classes / sources to the coverage task for integration tests? (maybe extending AndroidJUnitRunner in some way or changing the task itself through Groovy?)

Answer 1

You need to add the following in your build.gradle:

apply plugin: 'jacoco'
jacoco {
    toolVersion "0.7.5.201505241946"
}

Also in buildTypes:

debug {
    testCoverageEnabled = true

Run

gradle tasks 

and you will see a task called (If you are using debug build for coverage)

createDebugCoverageReport

Run

gradle createDebugCoverageReport

You will see coverage.ec in the following folder

$build_dir/outputs/code-coverage/connected/flavors/debug/coverage.ec

Which device you are using and which OS ? Some device with a particular OS produces empty coverage.ec Please share more information about OS and device you are using?