add aXe testing to conference views

test plan:
- run the spec files edited in this patch normally with
  yarn run jspec-watch path/to/spec
- tests should all pass as expected
- run the spec files edited in this patch with the new command
  yarn run a11y-report path/to/spec
- you should get aXe errors on existing a11y violations

Change-Id: Ic4c0fadd6aa6d51c6fe867ee9e3811d0d2f516d6
Reviewed-on: https://gerrit.instructure.com/130946
Tested-by: Jenkins
Reviewed-by: Steven Burnett <sburnett@instructure.com>
Product-Review: Matt Berns <mberns@instructure.com>
QA-Review: Matt Berns <mberns@instructure.com>

spec/coffeescripts/views/conferences/ConferenceViewSpec.coffee

@@ -22,8 +22,9 @@ define [
   'jquery',
   'helpers/I18nStubber',
   'helpers/fakeENV'
+  'helpers/assertions'
   'helpers/jquery.simulate'
-], (Backbone, Conference, ConferenceView, $, I18nStubber, fakeENV) ->
+], (Backbone, Conference, ConferenceView, $, I18nStubber, fakeENV, assertions) ->
   fixtures = $('#fixtures')
   conferenceView = (conferenceOpts = {}) ->
     conference = new Conference
@@ -43,6 +44,10 @@ define [
     teardown: ->
       fakeENV.teardown()
 
+  test 'it should be accessible', (assert) ->
+    done = assert.async()
+    assertions.isAccessible conferenceView(), done, {'a11yReport': true}
+
   test 'renders', ->
     view = conferenceView()
     ok view