Fix "uninitialized constant Gem" and other Travis errors

.travis.yml

@@ -20,7 +20,7 @@ sudo: false
 # original `cache: bundler` is a better option.
 cache: bundler
 
-bundler_args: "--binstubs --without documentation --path ../bundle --retry=3 --jobs=3"
+bundler_args: "--binstubs --path ../bundle --retry=3 --jobs=3"
 
 before_install:
   - script/clone_all_rspec_repos

Rakefile

@@ -27,7 +27,7 @@ RSpec::Core::RakeTask.new(:spec) do |t|
 end
 
 Cucumber::Rake::Task.new(:cucumber) do |t|
-  version = ENV.fetch("RAILS_VERSION", "~> 4.2.0")
+  version = ENV.fetch("RAILS_VERSION", "~> 4.2.0")[/\d[\.-]\d/]
   tags = []
 
   if version.to_f >= 5.1
@@ -60,12 +60,12 @@ namespace :generate do
 
       # Rails 4 cannot use a `rails` binstub generated by Bundler
       sh "rm -f #{bindir}/rails"
-      sh "bundle exec rails new ./tmp/example_app --skip-javascript --skip-sprockets --skip-git --skip-test-unit --skip-listen --skip-bundle --template=example_app_generator/generate_app.rb"
+      sh "bundle exec rails new ./tmp/example_app --no-rc --skip-javascript --skip-sprockets --skip-git --skip-test-unit --skip-listen --skip-bundle --template=example_app_generator/generate_app.rb"
 
       in_example_app do
         sh "./travis_retry_bundle_install.sh 2>&1"
         # Rails 4 cannot use a `rails` binstub generated by Bundler
-        sh "bundle binstubs rspec-core rake --force"
+        sh "bundle binstubs bundler rspec-core rake --force"
         sh "bundle binstubs railties" unless File.exist?("bin/rails")
 
         application_file = File.read("config/application.rb")
@@ -93,7 +93,8 @@ def in_example_app(*command_opts)
     app_dir = opts.fetch(:app_dir, app_dir)
   end
   Dir.chdir(app_dir) do
-    Bundler.with_clean_env do
+    Bundler.with_original_env do
+      ENV["BUNDLE_GEMFILE"] = "Gemfile"
       sh *command_opts unless command_opts.empty?
       yield if block_given?
     end
@@ -182,12 +183,12 @@ namespace :no_active_record do
 
         # Rails 4 cannot use a `rails` binstub generated by Bundler
         sh "rm -f #{bindir}/rails"
-        sh "bundle exec rails new #{example_app_dir} --skip-active-record --skip-javascript --skip-sprockets --skip-git --skip-test-unit --skip-listen --skip-bundle --template=example_app_generator/generate_app.rb"
+        sh "bundle exec rails new #{example_app_dir} --no-rc --skip-active-record --skip-javascript --skip-sprockets --skip-git --skip-test-unit --skip-listen --skip-bundle --template=example_app_generator/generate_app.rb"
 
         in_example_app(:app_dir => example_app_dir) do
           sh "./travis_retry_bundle_install.sh 2>&1"
           # Rails 4 cannot use a `rails` binstub generated by Bundler
-          sh "bundle binstubs rspec-core rake --force"
+          sh "bundle binstubs bundler rspec-core rake --force"
           sh "bundle binstubs railties" unless File.exist?("bin/rails")
 
           application_file = File.read("config/application.rb")

lib/rspec/rails/example/system_example_group.rb

@@ -49,7 +49,7 @@ def app
             dependency on a webserver and `capybara`, please add capybara to
             your Gemfile and configure a webserver (e.g. `Capybara.server =
             :webrick`) before attempting to use system tests.
-          """.gsub(/\s+/,' ').strip
+          """.gsub(/\s+/, ' ').strip
         end
 
         original_after_teardown =