spec: clean up some state between tests

specifically, make file rename form go away, and actually
get rid of the wiki page onunload event handler

Change-Id: Ie323ce89e55495d2cd4e1caa4c7b17e72f2fd5fc
Reviewed-on: https://gerrit.instructure.com/54859
Reviewed-by: Ethan Vizitei <evizitei@instructure.com>
Tested-by: Jenkins
Product-Review: Jeremy Stanley <jeremy@instructure.com>
QA-Review: Jeremy Stanley <jeremy@instructure.com>

app/coffeescripts/views/wiki/WikiPageEditView.coffee

@@ -92,7 +92,7 @@ define [
 
       @checkUnsavedOnLeave = true
       view = this
-      window.addEventListener 'beforeunload', @onUnload
+      $(window).on 'beforeunload', @onUnload
 
       unless @firstRender
         @firstRender = true

spec/coffeescripts/react_files/components/FileRenameFormSpec.coffee

@@ -18,9 +18,7 @@ define [
       @form = React.render(React.createFactory(FileRenameForm)(props), $('<div>').appendTo('#fixtures')[0])
 
     teardown: ->
-      #TODO: oddness with the current modal implementation makes teardown not work
-      #as the DOM has been mutated. Hopefully we can ease this pain with a react modal
-      #React.unmountComponentAtNode(@form.getDOMNode().parentNode)
+      React.unmountComponentAtNode(@form.getDOMNode().parentNode)
       $("#fixtures").empty()
 
   test 'switches to editing file name state with button click', ->

spec/coffeescripts/views/wiki/WikiPageEditViewSpec.coffee

@@ -15,6 +15,7 @@ define [
       @scrollSidebarStub.restore()
       @initStub.restore()
       @attachWikiEditorStub.restore()
+      $(window).off('beforeunload')
 
   test 'init wiki sidebar during render', ->
     wikiPageEditView = new WikiPageEditView
@@ -142,7 +143,6 @@ define [
     ok errors['title'], 'error when title is present, but blank'
     ok errors['title'][0].message, 'error message when title is present, but blank'
 
-
   module 'WikiPageEditView:JSON'
 
   testRights = (subject, options) ->