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Automated log on failure collection

When debugging tests, a set of logs is always needed to get a basic picture of the failure and the device under test. Sources include: Logcat, Tradefed host log, screenshot, etc.

In order to make it generic and painless for any test writer to get those logs, Tradefed has a built-in mechanism to help collecting them.

Configuration

To automatically collect some logs on failure, you can add the following option to your Tradefed command line:

--auto-collect LOGCAT_ON_FAILURE
or
--auto-collect SCREENSHOT_ON_FAILURE

To see the full list of possible values, checkout AutoLogCollector

For convenience, logcat and screenshot each have a direct flag:

--logcat-on-failure
and
--screenshot-on-failure

Note on suite modules (AndroidTest.xml)

Modules cannot direcly specify this option in the AndroidTest.xml, but they can use a module controller instead.