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Running Espresso Tests in parallel with Spoon and Android Test Sharding

Introduction to Android Espresso Testing and Spoon

Espresso UI test automation framework is Google’s de-facto testing platform for Android app developers.

No test engineer or developer will be quite unless it validates the functionality of his app on multiple devices and emulators. For that, there is another widely used tool called Spoon (there are also cloud-based solutions as mentioned above that support parallel execution on real devices). This tool, will collect all the target devices (that are visible via adb devices) test results and aggregate them into one HTML view that can be easily investigated.

Mobile Testing Blog


Android Test Sharding

The test runner supports splitting a single test suite into multiple shards, so you can easily run tests belonging to the same shard together as a group, under the same Instrumentation instance. Each shard is identified by an index number. When running tests, use the -e numShards option to specify the number of separate shards to create and the -e shardIndex option to specify which shard to run.

For example, to split the test suite into 10 shards and run only the tests grouped in the second shard, use the following command:

adb shell am instrument -w -e numShards 10 -e shardIndex 2


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