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Parallel Android Tests

Espresso driver provides a way for users to automate multiple Android sessions on a single machine on single server instance. All it involves is starting Appium server on any available port.

Note It is not possible to have more than one session running on the same device.

Important capabilities:

  • udid The destination device id
  • systemPort Set a unique port number for each parallel server session
  • chromedriverPort If you apply hybrid mode and use appium-chromedriver, set a unique ChromeDriver port for each parallel session. Otherwise, you might get a port conflict with the error message Address already in use (48) in the ChromeDriver log.

Troubleshooting

When running on Jenkins, watch out for the ProcessTreeKiller when running multiple parallel test jobs on the same machine. If you are spawning simulators in one test job, Jenkins might kill all your simulators when the first test ends - causing errors in the remaining test jobs!

Use BUILD_ID=dontKillMe to prevent this from happening.