RUBY-1742 Add Rails 5.1 environment for unit tests

test/environments/rails51/Gemfile

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+source 'https://rubygems.org'
+
+gem 'rake', '< 11'
+
+gem 'rails', '5.1.0'
+
+gem 'minitest', '5.2.3'
+gem 'mocha', '1.1', :require => false
+gem 'rack'
+gem 'rack-test'
+
+platforms :jruby do
+  gem "jruby-openssl"
+end
+
+platforms :ruby do
+  gem "mysql2"
+end
+
+gem "newrelic_rpm", :path => "../../.."
+
+gem 'pry', '~> 0.9.12'
+gem 'hometown', '~> 0.2.5'

test/environments/rails51/Rakefile

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+# Add your own tasks in files placed in lib/tasks ending in .rake,
+# for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
+
+require File.expand_path('../config/application', __FILE__)
+require 'rake'
+
+RpmTestApp::Application.load_tasks
+require 'tasks/all'
+
+Rake::Task["default"].clear
+task :default => [:'test:newrelic']

test/environments/rails51/config/application.rb

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+# encoding: utf-8
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/rpm/blob/master/LICENSE for complete details.
+
+require File.expand_path('../boot', __FILE__)
+
+require 'rails/all'
+
+Bundler.require(:default, Rails.env) if defined?(Bundler)
+
+module RpmTestApp
+  class Application < Rails::Application
+    config.encoding = "utf-8"
+    config.filter_parameters += [:password]
+    config.secret_key_base = '414fd9af0cc192729b2b6bffe9e7077c9ac8eed5cbb74c8c4cd628906b716770598a2b7e1f328052753a4df72e559969dc05b408de73ce040c93cac7c51a348e'
+    config.eager_load = false
+  end
+end

test/environments/rails51/config/boot.rb

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+# encoding: utf-8
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/rpm/blob/master/LICENSE for complete details.
+
+require 'rubygems'
+
+# Set up gems listed in the Gemfile.
+ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)
+
+require 'bundler/setup' if File.exists?(ENV['BUNDLE_GEMFILE'])

test/environments/rails51/config/database.yml

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+mysql: &mysql
+  adapter: mysql2
+  socket: <%= (`uname -s` =~ /Linux/ ) ? "" : "/tmp/mysql.sock" %>
+  username: root
+  host: localhost
+  database: <%= db = "#{ENV['RUBY_VERSION']}#{ENV['BRANCH']}"; db.empty? ? "rails_blog" : db %>
+
+sqlite3: &sqlite3
+<% if defined?(JRuby) %>
+  adapter: jdbcsqlite3
+<% else %>
+  adapter: sqlite3
+<% end %>
+  database: db/all.sqlite3
+  pool: 5
+  timeout: 5000
+  host: localhost
+
+development:
+  <<: *sqlite3
+
+test:
+  <<: *mysql
+
+production:
+  <<: *mysql

test/environments/rails51/config/environment.rb

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+# encoding: utf-8
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/rpm/blob/master/LICENSE for complete details.
+
+require File.expand_path('../application', __FILE__)
+RpmTestApp::Application.initialize!

test/environments/rails51/db/schema.rb

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+# encoding: utf-8
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/rpm/blob/master/LICENSE for complete details.
+
+# File is required to exist by Rails