* failures: a list of failures that occurred
* logurl: URL to the complete test log.
=== testfailures ===
Returns information on test failures.
This is different from information on oranges, in that (a) these failures may not have been starred and (b) there may be more than one failure per test.
Parameters:
* startday: Mandatory. In ISO format, e.g. 2011-05-27.
* endday: Mandatory. Also in ISO format.
* tree: Optional, defaults to all.
* type: Build type, opt or debug, defaults to all.
Returns an object with properties named by test run ID and containing an array of failures. Each failure is an object with the following properties:
* buildtype
* errors: an array of objects with 'status' and 'text' properties describing the error.
* testfailure_id
* buildid
* os
* testgroup_id
* tree
* machine
* platform
* test
* starttime
* date
* duration
* testgroup
* revision
* testsuite_id
* logurl