Test puma on Travis

Gemfile

@@ -69,6 +69,7 @@ gem 'mailman', require: false
 # To convert html to markdown
 gem 'reverse_markdown'
 # gem 'mysql2', '>= 0.4.4'
+gem 'puma', '~> 3.12'
 
 # run with `bundle install --without production` or `bundle install --without mysql` to exclude this
 group :mysql, :production do
@@ -96,7 +97,7 @@ group :development do
 end
 
 group :test, :development do
-  gem 'puma', '~> 3.12'
+  # gem 'puma', '~> 3.12'
   gem 'capybara'
   gem 'ci_reporter_test_unit'
   gem 'coveralls', require: false
@@ -119,5 +120,5 @@ end
 
 group :production do
   gem "scrypt", "~> 3"
-  gem 'passenger'
+  # gem 'passenger'
 end

Gemfile.lock

@@ -289,9 +289,6 @@ GEM
     parallel (1.13.0)
     parser (2.6.0.0)
       ast (~> 2.4.0)
-    passenger (6.0.1)
-      rack
-      rake (>= 0.8.1)
     phantomjs (2.1.1.0)
     php-serialize (1.2.0)
     power_assert (1.1.3)
@@ -547,7 +544,6 @@ DEPENDENCIES
   omniauth-twitter
   openssl (~> 2.1.2)
   paperclip (~> 6.1.0)
-  passenger
   phantomjs
   php-serialize
   progress_bar

test/application_system_test_case.rb

@@ -6,8 +6,4 @@ class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
 
   Selenium::WebDriver::Chrome::Options.new.add_argument(argument)
 
-  if Rails.env.production?
-    Capybara.run_server = false
-    Capybara.app_host = "http://0.0.0.0:3000/"
-  end
 end