tree e4b9a0f08a4fb755f183f26546afd8080f4d6b05
parent d025c562f0424381f6657aefdc6b33dbbdc2128a
author Lorenzo Colitti <lorenzo@google.com> 1613452446 +0900
committer Lorenzo Colitti <lorenzo@google.com> 1614866560 +0900

Change TetheringTest's UpstreamNetworkMonitor from mock to spy.

This allows future tests that want to exercise the interactions
between Tethering and UNM to do so.

Also verify what happens when UNM is initialized, and in setUp,
capture the NetworkCallback it files to track the default
network, so tests can send it NetworkCallbacks. (This callback
is only ever filed once.)

Test: test-only change
Change-Id: Iff9b62120cced41cc61263bfd4fa34f575d0ac00