Add first sign in feature specs

This sets up capybara with the new headless chrome driver and adds the
necessary requires in order to run single spec file. So far, there was
no other way than doing `bundle exec rake` due to missing requires.

Gemfile

@@ -60,6 +60,9 @@ group :test do
   gem 'shoulda', ">= 3.5"
   gem 'fabrication'
   gem 'faker'
+  gem 'capybara', '~> 2.4.4'
+  gem 'capybara-selenium', '~> 0.0.6'
+  gem 'chromedriver-helper', '~> 1.0'
 end
 
 group :production do

Gemfile.lock

@@ -53,6 +53,8 @@ GEM
       sshkit (>= 1.6.1, != 1.7.0)
     arbre (1.1.1)
       activesupport (>= 3.0.0)
+    archive-zip (0.11.0)
+      io-like (~> 0.3.0)
     arel (6.0.4)
     ast (2.4.0)
     autoprefixer-rails (6.3.1)
@@ -90,6 +92,14 @@ GEM
       rack (>= 1.0.0)
       rack-test (>= 0.5.4)
       xpath (~> 2.0)
+    capybara-selenium (0.0.6)
+      capybara
+      selenium-webdriver
+    childprocess (0.9.0)
+      ffi (~> 1.0, >= 1.0.11)
+    chromedriver-helper (1.2.0)
+      archive-zip (~> 0.10)
+      nokogiri (~> 1.8)
     chronic (0.10.2)
     coderay (1.1.2)
     coffee-rails (4.1.0)
@@ -138,6 +148,7 @@ GEM
       i18n (~> 0.5)
     faraday (0.9.1)
       multipart-post (>= 1.2, < 3)
+    ffi (1.9.23)
     formtastic (3.1.5)
       actionpack (>= 3.2.13)
     formtastic_i18n (0.6.0)
@@ -160,6 +171,7 @@ GEM
       has_scope (~> 0.6)
       railties (>= 4.2, <= 5.2)
       responders
+    io-like (0.3.0)
     jquery-rails (4.3.1)
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
@@ -303,6 +315,7 @@ GEM
       ruby-progressbar (~> 1.7)
       unicode-display_width (~> 1.0, >= 1.0.1)
     ruby-progressbar (1.9.0)
+    rubyzip (1.2.1)
     sass (3.4.21)
     sass-rails (5.0.7)
       railties (>= 4.0.0, < 6)
@@ -312,6 +325,9 @@ GEM
       tilt (>= 1.1, < 3)
     select2-rails (4.0.1)
       thor (~> 0.14)
+    selenium-webdriver (3.11.0)
+      childprocess (~> 0.5)
+      rubyzip (~> 1.2)
     shoulda (3.5.0)
       shoulda-context (~> 1.0, >= 1.0.1)
       shoulda-matchers (>= 1.4.1, < 3.0)
@@ -376,6 +392,8 @@ DEPENDENCIES
   capistrano-rails (~> 1.1)
   capistrano-rbenv (~> 2.1)
   capybara (~> 2.4.4)
+  capybara-selenium (~> 0.0.6)
+  chromedriver-helper (~> 1.0)
   coffee-rails
   dalli
   database_cleaner (= 1.3.0)

spec/features/sign_in_spec.rb

@@ -0,0 +1,29 @@
+require 'spec_helper'
+
+describe 'sign in' do
+  let!(:user) do
+    Fabricate(:user, email: 'user@timeoverflow.org', password: 'papapa22')
+  end
+
+  context 'with a valid password' do
+    it 'signs the user in' do
+      visit '/login'
+      fill_in 'user_email', with: user.email
+      fill_in 'user_password', with: 'papapa22'
+      click_button I18n.t('application.login_form.button')
+
+      expect(page).to have_content(I18n.t('application.navbar.sign_out'))
+    end
+  end
+
+  context 'with an invalid password' do
+    it 'shows an error' do
+      visit '/login'
+      fill_in 'user_email', with: user.email
+      fill_in 'user_password', with: 'wrong_password'
+      click_button I18n.t('application.login_form.button')
+
+      expect(page).to have_content(I18n.t('devise.failure.invalid'))
+    end
+  end
+end

spec/spec_helper.rb

@@ -7,9 +7,26 @@ require 'rspec/rails'
 require 'capybara/rails'
 require 'database_cleaner'
 require 'fabrication'
+require 'selenium/webdriver'
 require 'faker'
 I18n.reload!
 
+Capybara.register_driver :chrome do |app|
+  Capybara::Selenium::Driver.new(app, browser: :chrome)
+end
+
+Capybara.register_driver :headless_chrome do |app|
+  capabilities = Selenium::WebDriver::Remote::Capabilities.chrome(
+    chromeOptions: { args: %w(headless disable-gpu) }
+  )
+
+  Capybara::Selenium::Driver.new app,
+    browser: :chrome,
+    desired_capabilities: capabilities
+end
+
+Capybara.javascript_driver = :headless_chrome
+
 # Requires supporting ruby files with custom matchers and macros, etc,
 # in spec/support/ and its subdirectories.
 Dir[Rails.root.join("spec/support/**/*.rb")].each { |f| require f }