Apply suggestions from code review

Co-authored-by: Robert Knight <robertknight@gmail.com>

src/annotator/test/guest-test.js

@@ -183,7 +183,7 @@ describe('Guest', () => {
         assert.calledWith(fakeIntegration.fitSideBySide, dummyLayout);
       });
 
-      it('does not calls fitSideBySide if `Guest` is not the main annotatable frame', () => {
+      it('does not call fitSideBySide if `Guest` is not the main annotatable frame', () => {
         createGuest({ subFrameIdentifier: 'dummy' });
         const dummyLayout = {};
 

src/annotator/test/sidebar-test.js

@@ -619,14 +619,17 @@ describe('Sidebar', () => {
       sidebar.onFrameConnected('dummy', port1);
 
       assert.notCalled(sidebarBridge().createChannel);
+      assert.notCalled(guestBridge().createChannel);
     });
 
     it('create RPC channels for recognized source frames', () => {
       const sidebar = createSidebar();
       const { port1 } = new MessageChannel();
       sidebar.onFrameConnected('sidebar', port1);
+      sidebar.onFrameConnected('guest', port1);
 
       assert.calledWith(sidebarBridge().createChannel, port1);
+      assert.calledWith(guestBridge().createChannel, port1);
     });
   });