How to merge code coverage reports from multiple target devices? (Android, jacoco)

[mbwarr...@gmail.com]

Hi,

I have a device farm where I run my tests on. Everything works but the code coverage differs nearly every time because only the last coverage report from a device is used. Based on the Android version on the device, the coverage might differ.

I read about jacoco merge but all I can find are "multi project" samples but no sample where I could see how I could merge the coverage.ec files the jacoco plugin downloads from the devices.

Any idea?

[Marc R. Hoffmann]

Hi,

what "jacoco plugin" do you refer to? We provide Ant task and and Maven
goal for merging:

http://eclemma.org/jacoco/trunk/doc/ant.html#merge
http://eclemma.org/jacoco/trunk/doc/merge-mojo.html

Alternatively you might simply concatenate exec files. The report
generator will the consider probes from all sessions.

Regards,
-marc

[Martin Breuer]

Thanks for the fast response.

I talk about the jacoco plugin which is bundled in Gradle: https://docs.gradle.org/current/userguide/jacoco_plugin.html

When I run my jacoco coverage, each device (in my case up to 14) are used to run the tests on.

Whenever a device is done, the plugin pulls the coverage.ec file from the device and stores in it my build/outputs/code-coverage/coverage.ec file.

If another device is done, it does the same but overwrites the previously pulled file.

That means that only the last of 14 devices is used to create the coverage report.

Something that could help me is a way to give the coverage.ec a unique name so that they don't overwrite each other. Is that somehow possible?

I now I might have to ask at some gradle support community as well, but I just want to make sure that I didn't miss some configuration on the jacoco part.

[Marc R. Hoffmann]

Hi,

with JaCoCo itself different solutions are possible:

- append existing exec file instead of overwriting it (append option)
- give arbitrary names to written exec files (destfile option)

As you said you might better check with the maintainer of the Gradle plug-in.

Regards,
-marc

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[saveliyz...@gmail.com]

Hi Martin,

Did you find a solution?

[Martin Breuer]

Sadly nothing I tried worked out :(

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