How to run Espresso instrumentation tests in parallel in Firebase Test Lab?

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Currently I run Espresso tests on Firebase / Google Test Lab, but it takes time to run them all, as they run in sequentially.

Is there a way to run them in parallel?

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You would need to shard your tests so that you can kick off multiple batches of test that can run in parallel on different devices. Firebase doesn't provide a way to do this directly, but there is an open source project called Flank that can help.