commit 1a54afc5b194161deac341eaebed1553b6c5448b
author markchien <markchien@google.com> Sun Apr 19 22:50:35 2020 +0800
committer markchien <markchien@google.com> Fri Apr 24 21:16:06 2020 +0800
tree db927e8bb4d522f9746f3af31772a42ea07db0e9
parent 34ec9b0db7160712fbfb6a9e49680124ec53fe67

Test legacy tether/untether API and onError callback

Test legacy tether/untether API behavior. tether() rely on downstream
setup ready for tethering. Currently the only user is bluetooth
tethering. For other tetherings, there is no guaranteed that calling
tether() can always switch given interface to tethered. Tethering
may callback with onError depend on the interface status. Caller
should use startTethering/stopTethering API instead of these
legacy APIs.

This change also change the precondition verification of startTethering.
If tethering interface got error last time, such interface would not
be reported as tetherable.

Bug: 150632712
Test: atest CtsTetheringTest
Change-Id: Ifb3a0618208ffd0ff224c60f377036bc22ba0565