Add tests for sidebar closing when user clicks or taps in document

src/annotator/sidebar.coffee

@@ -176,6 +176,9 @@ module.exports = class Sidebar extends Host
       .removeClass('h-icon-chevron-right')
       .addClass('h-icon-chevron-left')
 
+  isOpen: ->
+    !@frame.hasClass('annotator-collapsed')
+
   createAnnotation: (annotation = {}) ->
     super
     this.show() unless annotation.$highlight

src/annotator/test/sidebar-test.coffee

@@ -173,3 +173,16 @@ describe 'Sidebar', ->
       hide = sandbox.stub(sidebar, 'hide')
       sidebar.onSwipe({type: 'swiperight'})
       assert.calledOnce(hide)
+
+  describe 'document events', ->
+
+    sidebar = null
+
+    beforeEach ->
+      sidebar = createSidebar({})
+
+    it 'closes the sidebar when the user taps or clicks in the page', ->
+      for event in ['click', 'touchstart']
+        sidebar.show()
+        sidebar.element.trigger(event)
+        assert.isFalse(sidebar.isOpen())