VRFS-2473 : Add metronome feature tests.

web/app/assets/javascripts/fakeJamClient.js

@@ -765,7 +765,7 @@
 
         function getPeerState(clientId) {
             return {
-                ntp_stable: Math.random() > 0.2
+                ntp_stable: Math.random() > 0.5
             }
         }
 

web/spec/features/in_session_spec.rb

@@ -111,6 +111,26 @@ describe "In a Session", :js => true, :type => :feature, :capybara_feature => tr
     end
   end
 
+  specify "metronome" do
+    user = FactoryGirl.create(:user)
+    invitee = FactoryGirl.create(:user)
+    FactoryGirl.create(:friendship, :user => user, :friend => invitee)
+    in_client(user) do
+      create_session
+      
+      # Call it 10 times.  The fake jam client will randomly ntp_stable:false 50% of the time
+      10.times do 
+        find('#open-a-metronome').trigger(:click)
+      end
+      sleep(2)
+      
+      # we should have received an error one of the times, but it should open eventually:
+      find('#notification').should have_text("Couldn't open metronome")
+      expect(page).to have_selector('.track-label[title="Metronome"]')
+      #save_screenshot("metro.png")      
+    end
+  end      
+
   specify "invitee receives notification when creator invites musician" do
     pending "blocked on testing this via front-end - fakeJamClient doesn't support invite UX"
     user = FactoryGirl.create(:user)