src/ruby/spec/auth/service_account_spec.rb

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spec_dir = File.expand_path(File.join(File.dirname(__FILE__)))
$LOAD_PATH.unshift(spec_dir)
$LOAD_PATH.uniq!

require 'apply_auth_examples'
require 'grpc/auth/service_account'
require 'jwt'
require 'multi_json'
require 'openssl'
require 'spec_helper'

describe GRPC::Auth::ServiceAccountCredentials do
  before(:example) do
    @key = OpenSSL::PKey::RSA.new(2048)
    cred_json = {
      private_key_id: 'a_private_key_id',
      private_key: @key.to_pem,
      client_email: 'app@developer.gserviceaccount.com',
      client_id: 'app.apps.googleusercontent.com',
      type: 'service_account'
    }
    cred_json_text = MultiJson.dump(cred_json)
    @client = GRPC::Auth::ServiceAccountCredentials.new(
        'https://www.googleapis.com/auth/userinfo.profile',
        StringIO.new(cred_json_text))
  end

  def make_auth_stubs(with_access_token: '')
    Faraday::Adapter::Test::Stubs.new do |stub|
      stub.post('/oauth2/v3/token') do |env|
        params = Addressable::URI.form_unencode(env[:body])
        _claim, _header = JWT.decode(params.assoc('assertion').last,
                                     @key.public_key)
        want = ['grant_type', 'urn:ietf:params:oauth:grant-type:jwt-bearer']
        expect(params.assoc('grant_type')).to eq(want)
        build_json_response(
          'access_token' => with_access_token,
          'token_type' => 'Bearer',
          'expires_in' => 3600
        )
      end
    end
  end

  it_behaves_like 'apply/apply! are OK'
end