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Testing in Parallel

It is possible to execute tests in parallel using XCUITest driver. Appium allows to do this on a per-process (multiple server processes running on different ports managing single session) or a per-request basis (single server process managing multiple sessions, more preferable, uses less resources and ensures better control over running sessions).

!!! note

If you are _not_ going to run your tests in parallel, consider enabling the `--session-override`
Appium server argument. It forces the server to close all pending sessions before a new one
could be opened, which allows you to avoid possible issues with such sessions silently
running/expiring in the background.

Important Real Device Capabilities

  • udid must be a unique device UDID for each parallel session.
  • wdaLocalPort must be a unique port number for each parallel session. The default value is 8100.
  • derivedDataPath set the unique derived data path root for each driver instance. This will help to avoid possible conflicts and to speed up the parallel execution.
  • mjpegServerPort must be a unique port number for each parallel session if you are going to record a video stream from it. The default value is 9100.

Important Simulator Capabilities

  • Either udid, which is the unique simulator UDID for each parallel session (it could be retrieved from xcrun simctl list command output), or a unique combination of deviceName and platformVersion capabilities to identify the appropriate simulator with the given name and version number for each parallel session.
  • wdaLocalPort must be a unique port number for each parallel session. The default value is 8100.
  • derivedDataPath set the unique derived data path root for each driver instance. This will help to avoid possible conflicts and to speed up the parallel execution.
  • mjpegServerPort must be a unique port number for each parallel session if you are going to record a video stream from it. The default value is 9100.