class Rspec::Generators::InstallGenerator

def generate_rspec_init(tmpdir)
  initializer = ::RSpec::Core::ProjectInitializer.new(
    destination: tmpdir,
    report_stream: StringIO.new
  )
  initializer.run
  spec_helper_path = File.join(tmpdir, 'spec', 'spec_helper.rb')
  replace_generator_command(spec_helper_path)
  remove_warnings_configuration(spec_helper_path)
end