Do not rely on solidus_auth_devise for auth

We don't need to be testing whether the login page works for this gem.

Gemfile

@@ -20,9 +20,6 @@ end
 # See https://github.com/bundler/bundler/issues/6677
 gem 'rails', '>0.a'
 
-# Provides basic authentication functionality for testing parts of your engine
-gem 'solidus_auth_devise'
-
 case ENV.fetch('DB', nil)
 when 'mysql'
   gem 'mysql2'

spec/features/reviews_spec.rb

@@ -125,12 +125,9 @@
   private
 
   def sign_in_as!(user)
-    visit spree.login_path
-    within '#new_spree_user' do
-      fill_in 'Email', with: user.email
-      fill_in 'Password', with: user.password
-    end
-    click_button 'Login'
+    allow_any_instance_of(ApplicationController).to receive_messages current_user: user
+    allow_any_instance_of(ApplicationController).to receive_messages spree_current_user: user
+    allow_any_instance_of(ApplicationController).to receive_messages spree_user_signed_in?: true
   end
 
   def click_star(num)