Speculative fix for test flakiness, part 2

Use clearInvocations instead of reset on the mocks so as to avoid
messing with mockito internals excessively/doing even more stubbing.

Test: run the tests a bunch of times
Bug: 112266489
Change-Id: I10bb87103dccfafaaa2336aba06b59920c42adac
1 file changed