src/ruby/spec/auth/compute_engine_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 'faraday'
require 'grpc/auth/compute_engine'
require 'spec_helper'

describe GRPC::Auth::GCECredentials do
  MD_URI = '/computeMetadata/v1/instance/service-accounts/default/token'
  GCECredentials = GRPC::Auth::GCECredentials

  before(:example) do
    @client = GCECredentials.new
  end

  def make_auth_stubs(with_access_token: '')
    Faraday::Adapter::Test::Stubs.new do |stub|
      stub.get(MD_URI) do |env|
        headers = env[:request_headers]
        expect(headers['Metadata-Flavor']).to eq('Google')
        build_json_response(
            'access_token' => with_access_token,
            'token_type' => 'Bearer',
            'expires_in' => 3600)
      end
    end
  end

  it_behaves_like 'apply/apply! are OK'

  describe '#on_gce?' do
    it 'should be true when Metadata-Flavor is Google' do
      stubs = Faraday::Adapter::Test::Stubs.new do |stub|
        stub.get('/') do |_env|
          [200,
           { 'Metadata-Flavor' => 'Google' },
           '']
        end
      end
      c = Faraday.new do |b|
        b.adapter(:test, stubs)
      end
      expect(GCECredentials.on_gce?(connection: c)).to eq(true)
      stubs.verify_stubbed_calls
    end

    it 'should be false when Metadata-Flavor is not Google' do
      stubs = Faraday::Adapter::Test::Stubs.new do |stub|
        stub.get('/') do |_env|
          [200,
           { 'Metadata-Flavor' => 'NotGoogle' },
           '']
        end
      end
      c = Faraday.new do |b|
        b.adapter(:test, stubs)
      end
      expect(GCECredentials.on_gce?(connection: c)).to eq(false)
      stubs.verify_stubbed_calls
    end

    it 'should be false if the response is not 200' do
      stubs = Faraday::Adapter::Test::Stubs.new do |stub|
        stub.get('/') do |_env|
          [404,
           { 'Metadata-Flavor' => 'Google' },
           '']
        end
      end
      c = Faraday.new do |b|
        b.adapter(:test, stubs)
      end
      expect(GCECredentials.on_gce?(connection: c)).to eq(false)
      stubs.verify_stubbed_calls
    end
  end
end