QA: add modern assertions to flyout tests

"Then" steps should always contains RSpec assertions. In the
past this meant using some version of the word "should", but
the modern convention in RSpec is to use "expect()" as I
did here.

Change-Id: I1c438a310803e29c0985328a76d2ec08578e0cb0
Merge "QA: add modern assertions to flyout tests"