Fix test failures for jam_track rights.

ruby/spec/jam_ruby/models/jam_track_right_spec.rb

@@ -105,19 +105,20 @@ describe JamTrackRight do
     end
 
     it "bogus key" do
-      JamTrackRight.list_keys(user, ['a']).should eq([])
+      JamTrackRight.list_keys(user, [2112]).should eq([])
     end
 
     it "valid track with no rights to it by querying user" do
       jam_track = FactoryGirl.create(:jam_track)
       keys = JamTrackRight.list_keys(user, [jam_track.id])
-      keys.length.should == 0
+      keys.should have(1).items
+      keys[0]['private_key'].should be_nil
     end
 
     it "valid track with rights to it by querying user" do
       jam_track_right = FactoryGirl.create(:jam_track_right, private_key: 'keyabc')
       keys = JamTrackRight.list_keys(jam_track_right.user, [jam_track_right.jam_track.id])
-      keys.length.should == 1
+      keys.should have(1).items
       keys[0].id.should == jam_track_right.jam_track.id
       keys[0]['private_key'].should eq('keyabc')
     end