George Kadianakis authored Sep 12, 2017 and Nick Mathewson committed Sep 13, 2017

We enrich the test_client_cache() test in two ways:

a) We check that transitioning time periods also cleans up expired
   descriptors in client memory.

b) We test hs_cache_lookup_as_client() instead of
   lookup_v3_desc_as_client(). The former is a higher level function
   which calls the latter and allows us to test deeper into the
   subsystem.