1) Mongoid.disconnect_clients disconnects from all active clients
     Failure/Error: expect(client.cluster).to receive(:disconnect!).and_call_original
     
       (#<Mongo::Cluster:0x7040 servers=[#<Mongo::Server:0x7100 address=localhost:27017 PRIMARY>, #<Mongo::Server:0x7120 address=localhost:27018 SECONDARY>] topology=ReplicaSetWithPrimary[localhost:27017,localhost:27018,localhost:27019,name=test-rs,v=1,e=7fffffff0000000000000001]>).disconnect!(*(any args))
           expected: 1 time with any arguments
           received: 0 times with any arguments
     # ./spec/mongoid_spec.rb:80:in `block (4 levels) in <top (required)>'