pagerduty_spec.rb failing when run separately

gistfile1.txt

jesse@Heart-of-Gold flapjack $ be rspec spec/lib/flapjack/gateways/pagerduty_spec.rb
Run options: include {:focus=>true}

All examples were filtered out; ignoring {:focus=>true}
  1) Flapjack::Gateways::Pagerduty prompts the blocking redis connection to quit
     Failure/Error: EM::Hiredis.should_receive(:connect).and_return(shutdown_redis)
     NameError:
       uninitialized constant EventMachine::Hiredis
     # ./spec/lib/flapjack/gateways/pagerduty_spec.rb:16:in `block (2 levels) in <top (required)>'

 8/8 |======================================================== 100 =========================================================>| Time: 00:00:00

Finished in 0.05106 seconds
8 examples, 1 failure

Failed examples:

rspec ./spec/lib/flapjack/gateways/pagerduty_spec.rb:13 # Flapjack::Gateways::Pagerduty prompts the blocking redis connection to quit

Randomized with seed 48459