rails--rails/railties/test/application/rake/dbs_test.rb

require "isolation/abstract_unit"

module ApplicationTests
  module RakeTests
    class RakeDbsTest < ActiveSupport::TestCase
      include ActiveSupport::Testing::Isolation

      def setup
        build_app
        boot_rails
        FileUtils.rm_rf("#{app_path}/config/environments")
      end

      def teardown
        teardown_app
      end

      def database_url_db_name
        File.join(app_path, "db/database_url_db.sqlite3")
      end

      def set_database_url
        ENV['RAILS_DATABASE_URL'] = File.join("sqlite3://:@localhost", database_url_db_name)
        # ensure it's using the DATABASE_URL
        FileUtils.rm_rf("#{app_path}/config/database.yml")
        File.open("#{app_path}/config/database.yml", 'w') do |f|
          yaml = <<-YAML.strip_heredoc
            #{ENV['RAILS_ENV']}:
              url: <%= ENV['RAILS_DATABASE_URL'] %>
          YAML
          f << yaml
        end
      end

      def expected
        @expected ||= {}
      end

      def db_create_and_drop
        Dir.chdir(app_path) do
          output = `bundle exec rake db:create`
          assert_equal output, ""
          assert File.exist?(expected[:database])
          assert_equal expected[:database],
                        ActiveRecord::Base.connection_config[:database]
          output = `bundle exec rake db:drop`
          assert_equal output, ""
          assert !File.exist?(expected[:database])
        end
      end

      test 'db:create and db:drop without database url' do
        require "#{app_path}/config/environment"
        expected[:database] = ActiveRecord::Base.configurations[Rails.env]['database']
        db_create_and_drop
       end

      test 'db:create and db:drop with database url' do
        require "#{app_path}/config/environment"
        set_database_url
        expected[:database] = database_url_db_name
        db_create_and_drop
      end

      def db_migrate_and_status
        Dir.chdir(app_path) do
          `rails generate model book title:string;
           bundle exec rake db:migrate`
          output = `bundle exec rake db:migrate:status`
          assert_match(%r{database:\s+\S*#{Regexp.escape(expected[:database])}}, output)
          assert_match(/up\s+\d{14}\s+Create books/, output)
        end
      end

      test 'db:migrate and db:migrate:status without database_url' do
        require "#{app_path}/config/environment"
        expected[:database] = ActiveRecord::Base.configurations[Rails.env]['database']
        db_migrate_and_status
      end

      test 'db:migrate and db:migrate:status with database_url' do
        require "#{app_path}/config/environment"
        set_database_url
        expected[:database] = database_url_db_name
        db_migrate_and_status
      end

      def db_schema_dump
        Dir.chdir(app_path) do
          `rails generate model book title:string;
           rake db:migrate db:schema:dump`
          schema_dump = File.read("db/schema.rb")
          assert_match(/create_table \"books\"/, schema_dump)
        end
      end

      test 'db:schema:dump without database_url' do
        db_schema_dump
      end

      test 'db:schema:dump with database_url' do
        set_database_url
        db_schema_dump
      end

      def db_fixtures_load
        Dir.chdir(app_path) do
          `rails generate model book title:string;
           bundle exec rake db:migrate db:fixtures:load`
          assert_match(/#{expected[:database]}/,
                    ActiveRecord::Base.connection_config[:database])
          require "#{app_path}/app/models/book"
          assert_equal 2, Book.count
        end
      end

      test 'db:fixtures:load without database_url' do
        require "#{app_path}/config/environment"
        expected[:database] =  ActiveRecord::Base.configurations[Rails.env]['database']
        db_fixtures_load
      end

      test 'db:fixtures:load with database_url' do
        require "#{app_path}/config/environment"
        set_database_url
        expected[:database] = database_url_db_name
        db_fixtures_load
      end

      def db_structure_dump_and_load
        Dir.chdir(app_path) do
          `rails generate model book title:string;
           bundle exec rake db:migrate db:structure:dump`
          structure_dump = File.read("db/structure.sql")
          assert_match(/CREATE TABLE \"books\"/, structure_dump)
          `bundle exec rake environment db:drop db:structure:load`
          assert_match(/#{expected[:database]}/,
                        ActiveRecord::Base.connection_config[:database])
          require "#{app_path}/app/models/book"
          #if structure is not loaded correctly, exception would be raised
          assert Book.count, 0
        end
      end

      test 'db:structure:dump and db:structure:load without database_url' do
        require "#{app_path}/config/environment"
        expected[:database] =  ActiveRecord::Base.configurations[Rails.env]['database']
        db_structure_dump_and_load
      end

      test 'db:structure:dump and db:structure:load with database_url' do
        require "#{app_path}/config/environment"
        set_database_url
        expected[:database] = database_url_db_name
        db_structure_dump_and_load
      end

      def db_test_load_structure
        Dir.chdir(app_path) do
          `rails generate model book title:string;
           bundle exec rake db:migrate db:structure:dump db:test:load_structure`
          ActiveRecord::Base.configurations = Rails.application.config.database_configuration
          ActiveRecord::Base.establish_connection :test
          require "#{app_path}/app/models/book"
          #if structure is not loaded correctly, exception would be raised
          assert Book.count, 0
          assert_match(/#{ActiveRecord::Base.configurations['test']['database']}/,
                        ActiveRecord::Base.connection_config[:database])
        end
      end

      test 'db:test:load_structure without database_url' do
        require "#{app_path}/config/environment"
        db_test_load_structure
      end
    end
  end
end