Fix build by pinning Selenium on Rails 5.2 (#2111)

Author: JonRowe

Rakefile

@@ -183,7 +183,7 @@ 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} --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"
+        sh "bundle exec rails new #{example_app_dir} --no-rc --skip-active-record --skip-javascript --skip-bootsnap --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"

example_app_generator/generate_app.rb

@@ -32,7 +32,11 @@
     append_to_file('Gemfile', "gem 'rails-controller-testing', :git => 'https://github.com/rails/rails-controller-testing'\n")
   end
 
-  if Rails::VERSION::STRING >= '5.2.0'
+  if Rails::VERSION::STRING >= "5.1.0"
+    gsub_file "Gemfile", /.*selenium-webdriver.*/, "gem 'selenium-webdriver', '<= 3.14'"
+  end
+
+  if Rails::VERSION::STRING >= '5.2.0' && Rails::VERSION::STRING < '6'
     copy_file sqlite_initializer, 'config/initializers/sqlite3_fix.rb'
   end