Add axe depedency

Add test helper for a11y check

Gemfile

@@ -105,6 +105,8 @@ group :test do
   gem 'capybara-screenshot'
   gem 'launchy' # open up capybara screenshots automatically with `save_and_open_screenshot`
   gem 'webdrivers'
+  gem 'axe-core-capybara'
+  gem 'axe-core-api'
 
   # Test coverage related libraries
   gem 'simplecov', require: false

Gemfile.lock

@@ -80,6 +80,16 @@ GEM
       public_suffix (>= 2.0.2, < 6.0)
     afm (0.2.2)
     ast (2.4.2)
+    axe-core-api (4.7.0)
+      dumb_delegator
+      virtus
+    axe-core-capybara (4.7.0)
+      axe-core-api
+      dumb_delegator
+    axiom-types (0.1.1)
+      descendants_tracker (~> 0.0.4)
+      ice_nine (~> 0.11.0)
+      thread_safe (~> 0.3, >= 0.3.1)
     bcrypt (3.1.18)
     better_html (2.0.1)
       actionview (>= 6.0)
@@ -114,12 +124,16 @@ GEM
       capybara (>= 1.0, < 4)
       launchy
     coderay (1.1.3)
+    coercible (1.0.0)
+      descendants_tracker (~> 0.0.1)
     colorize (0.8.1)
     concurrent-ruby (1.2.2)
     crass (1.0.6)
     cssbundling-rails (1.1.2)
       railties (>= 6.0.0)
     date (3.3.3)
+    descendants_tracker (0.0.4)
+      thread_safe (~> 0.3, >= 0.3.1)
     devise (4.9.2)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
@@ -133,6 +147,7 @@ GEM
     dotenv-rails (2.8.1)
       dotenv (= 2.8.1)
       railties (>= 3.2)
+    dumb_delegator (1.0.0)
     erubi (1.12.0)
     factory_bot (6.2.1)
       activesupport (>= 5.0.0)
@@ -171,6 +186,7 @@ GEM
       rails-i18n
       rainbow (>= 2.2.2, < 4.0)
       terminal-table (>= 1.5.1)
+    ice_nine (0.11.2)
     jsbundling-rails (1.1.1)
       railties (>= 6.0.0)
     json (2.6.3)
@@ -395,6 +411,7 @@ GEM
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
     thor (1.2.1)
+    thread_safe (0.3.6)
     timecop (0.9.6)
     timeout (0.3.1)
     ttfunk (1.7.0)
@@ -409,6 +426,10 @@ GEM
     unicode-display_width (2.4.2)
     uniform_notifier (1.16.0)
     version_gem (1.1.1)
+    virtus (2.0.0)
+      axiom-types (~> 0.1)
+      coercible (~> 1.0)
+      descendants_tracker (~> 0.0, >= 0.0.3)
     warden (1.2.9)
       rack (>= 2.0.9)
     webdrivers (5.2.0)
@@ -432,6 +453,8 @@ PLATFORMS
 DEPENDENCIES
   activerecord-session_store
   acts_as_tenant (~> 0.5.0)
+  axe-core-api
+  axe-core-capybara
   bootsnap (>= 1.4.2)
   bootstrap_form (~> 4.5.0)
   bullet

test/integration/google_sso_test.rb

@@ -25,5 +25,9 @@ class GoogleSSOTest < ActionDispatch::IntegrationTest
 
       assert has_content? 'Forgot your password?'
     end
+    it 'sign in page is accessible' do
+      visit root_path
+      wait_for_element 'Sign in with Google'
+      assert_accessible(page)
   end
 end

test/test_helper.rb

@@ -10,6 +10,8 @@
 require 'omniauth_helper'
 require 'integration_helper'
 require 'rack/test'
+require 'axe-capybara'
+require 'axe-core-api'
 
 # CI only
 if ENV['CI']
@@ -129,3 +131,8 @@ class ActionDispatch::IntegrationTest
 
   # for controllers
 end
+
+def assert_accessible(page, matcher = Axe::Matchers::BeAxeClean.new.according_to(:wcag21aa, 'best-practice'))
+  audit_result = matcher.audit(page)
+  assert(audit_result.passed?, audit_result.failure_message)
+end