12. The system of claim 1 , the operations further comprising based on the one or more audio quality metrics, determining adjustments for the a test audio subsystem configuration of the mobile device or the mockup of the mobile device.
1. A system comprising: one or more computers and one or more storage devices storing instructions that are operable, when executed by the one or more computers, to cause the one or more computers to perform operations comprising: receiving, from a mobile device or a mockup of the mobile device and by an automatic speech recognition (ASR) engine that processes voice search queries for a search engine, (i) a voice search query and (ii) data indicating that the voice search query represents audio test data for a test of an audio quality of an audio signal output by a test audio subsystem configuration of the mobile device or the mockup of the mobile device, wherein the voice search query includes a pre-recorded test utterance used for testing mobile devices or mockups of mobile devices; generating, in response to receiving the data indicating that the voice search query represents audio test data for a test of the audio quality of the audio signal output by a test audio subsystem configuration of the mobile device or on the mockup of the mobile device, one or more audio quality metrics that reflect the audio quality of the audio signal output by the test audio subsystem configuration of the mobile device or the mockup of the mobile device; and generating a response to the voice search query by the ASR engine, wherein the response references at least one of the one or more audio quality metrics.