Add specs for #open_connection, #open_channel, #declare_exchange
Add specs for #open_connection, #open_channel, #declare_exchange

Use the specs for '#set_up_amqp_connection' to test the methods
The specs for set_up_amqp_connection now only test that it calls the
dangerous methods equivalent of those methods

gocardless/hutch,gocardless/hutch,Fatsoma/hutch,Fatsoma/hutch,MadBomber/hutch,gocardless/hutch,Fatsoma/hutch