unskips test_use_external_cache, bumps fixturized policy to 3 of 5.

tests/fixtures.py

@@ -199,7 +199,7 @@ def idle_policy(testerchain, alice, bob, application_economics):
     """Creates a Policy, in a manner typical of how Alice might do it, with a unique label"""
     random_label = generate_random_label()
     expiration = maya.now() + timedelta(days=1)
-    threshold, shares = 2, 3
+    threshold, shares = 3, 5
     price = alice.payment_method.quote(
         expiration=expiration.epoch, shares=shares
     ).value  # TODO: use default quote option

tests/integration/characters/test_bob_handles_frags.py

@@ -76,7 +76,6 @@ def test_single_retrieve_conditions_empty_list(enacted_policy, bob, ursulas):
     assert cleartexts == [message]
 
 
-@pytest.mark.skip("This test is not working yet.  It's not clear what the correct behavior is and if it's the same in nucypher-ts.")
 def test_use_external_cache(enacted_policy, bob, ursulas):
 
     bob.start_learning_loop()