Spec: stabilize and improve simctl integration examples

Author: jmoody

spec/integration/simctl_spec.rb

@@ -15,6 +15,10 @@
   end
 
   it "#wait_for_shutdown" do
+    RunLoop::CoreSimulator.quit_simulator
+    core_sim = RunLoop::CoreSimulator.new(device, app)
+    core_sim.launch_simulator
+    RunLoop::CoreSimulator.quit_simulator
     expect(simctl.wait_for_shutdown(device, 10.0, 0)).to be_truthy
   end
 
@@ -23,8 +27,6 @@
     delay = RunLoop::CoreSimulator::WAIT_FOR_SIMULATOR_STATE_INTERVAL
     expect(simctl.erase(device, timeout, delay)).to be_truthy
 
-    device.simulator_wait_for_stable_state
-
     core_sim.launch_simulator
 
     timeout = RunLoop::CoreSimulator::DEFAULT_OPTIONS[:install_app_timeout]