Add Syck to Gemfile

Gemfile

@@ -64,6 +64,7 @@ gem 'sidekiq', require: nil
 gem 'simplecov', require: false
 gem 'simplecov-cobertura', require: false
 gem 'sucker_punch', '~> 2.0', require: nil
+gem 'syck', require: nil
 gem 'yard', require: nil
 gem 'yarjuf'
 

spec/integration/syck_spec.rb

@@ -0,0 +1,29 @@
+# Licensed to Elasticsearch B.V. under one or more contributor
+# license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright
+# ownership. Elasticsearch B.V. licenses this file to you under
+# the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+# frozen_string_literal: true
+
+require 'integration_helper'
+require 'syck'
+
+RSpec.describe 'Syck YAML' do
+
+  it 'loads from config file' do
+    config = ElasticAPM::Config.new(config_file: 'spec/fixtures/elastic_apm.yml')
+    expect(config.server_url).to eq 'somewhere-config.com'
+  end
+end