Add test for Rails Redis cookie store integration

rails-app/Gemfile

@@ -63,3 +63,5 @@ gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
 
 gem 'devise'
 gem 'faker', :git => 'https://github.com/stympy/faker.git', :branch => 'master'
+gem 'redis-rails'
+

rails-app/Gemfile.lock

@@ -165,6 +165,23 @@ GEM
     rb-fsevent (0.10.3)
     rb-inotify (0.10.0)
       ffi (~> 1.0)
+    redis (4.1.0)
+    redis-actionpack (5.0.2)
+      actionpack (>= 4.0, < 6)
+      redis-rack (>= 1, < 3)
+      redis-store (>= 1.1.0, < 2)
+    redis-activesupport (5.0.7)
+      activesupport (>= 3, < 6)
+      redis-store (>= 1.3, < 2)
+    redis-rack (2.0.5)
+      rack (>= 1.5, < 3)
+      redis-store (>= 1.2, < 2)
+    redis-rails (5.0.2)
+      redis-actionpack (>= 5.0, < 6)
+      redis-activesupport (>= 5.0, < 6)
+      redis-store (>= 1.2, < 2)
+    redis-store (1.6.0)
+      redis (>= 2.2, < 5)
     regexp_parser (1.3.0)
     responders (2.4.1)
       actionpack (>= 4.2.0, < 6.0)
@@ -251,6 +268,7 @@ DEPENDENCIES
   pg (>= 0.18, < 2.0)
   puma (~> 3.11)
   rails (~> 5.2.2, >= 5.2.2.1)
+  redis-rails
   sass-rails (~> 5.0)
   selenium-webdriver
   spring

rails-app/config/initializers/session_store.rb

@@ -0,0 +1,5 @@
+# Rails.application.config.session_store :redis_store,
+#   servers: ["redis://redis:6379/0/session"],
+#   expire_after: 90.minutes,
+#   key: "_app_session",
+#   threadsafe: false