You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: predictive_tests.rb
    path of file: ./repos/gitlabhq/tooling/lib/tooling
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require_relative 'find_changes'
require_relative 'find_tests'
require_relative 'find_files_using_feature_flags'
require_relative 'mappings/graphql_base_type_mappings'
require_relative 'mappings/js_to_system_specs_mappings'
require_relative 'mappings/partial_to_views_mappings'
require_relative 'mappings/view_to_js_mappings'
require_relative 'mappings/view_to_system_specs_mappings'

module Tooling
  class PredictiveTests
    REQUIRED_ENV_VARIABLES = %w[
      RSPEC_CHANGED_FILES_PATH
      RSPEC_MATCHING_TESTS_PATH
      RSPEC_VIEWS_INCLUDING_PARTIALS_PATH
      FRONTEND_FIXTURES_MAPPING_PATH
      RSPEC_MATCHING_JS_FILES_PATH
    ].freeze

    def initialize
      missing_env_variables = REQUIRED_ENV_VARIABLES.select { |key| ENV[key.to_s] == '' }
      unl
    
    def execute
      Tooling::FindChanges.new(
        from: :api,
        changed_files_pathname: rspec_changed_files_path
      ).execute
      Tooling::FindFilesUsingFeatureFlags.new(changed_files_pathname: rspec_changed_files_path).execute
      Tooling::FindTests.new(rspec_changed_files_path, rspec_matching_tests_path).execute
      Tooling::Mappings::PartialToViewsMappings.new(
        rspec_changed_files_path, rspec_views_including_partials_path).execute
      Tooling::FindTests.new(rspec_views_including_partials_path, rspec_matching_tests_path).execute
      Tooling::Mappings::JsToSystemSpecsMappings.new(rspec_changed_files_path, rspec_matching_tests_path).execute
      Tooling::Mappings::GraphqlBaseTypeMappings.new(rspec_changed_files_path, rspec_matching_tests_path).execute
      Tooling::Mappings::ViewToSystemSpecsMappings.new(rspec_changed_files_path, rspec_matching_tests_path).execute
      Tooling::FindChanges.new(
        from: :changed_files,
        changed_files_pathname: rspec_changed_files_path,
        predictive_tests_pathname: rspec_matching_tests_path,
        frontend_fixtures_mapping_pathname: frontend_fixtures_mapping_path
      ).execute
      Tooling::Mappings::ViewToJsMappings.new(rspec_changed_files_path, rspec_matching_js_files_path).execute
    end