Merge pull request #2118 from newrelic/2117_gemspec_test

Create test for agent_helper in gem files

newrelic_rpm.gemspec

@@ -39,7 +39,7 @@ Gem::Specification.new do |s|
     'homepage_uri' => 'https://newrelic.com/ruby'
   }
 
-  reject_list = File.read('./.build_ignore').split("\n")
+  reject_list = File.read(File.expand_path('../.build_ignore', __FILE__)).split("\n")
   file_list = `git ls-files -z`.split("\x0").reject { |f| reject_list.any? { |rf| f.start_with?(rf) } }
   # test/agent_helper.rb is a requirement for the NewRelic::Agent.require_test_helper public API
   test_helper_path = 'test/agent_helper.rb'

test/new_relic/gemspec_files_test.rb

@@ -0,0 +1,22 @@
+# This file is distributed under New Relic's license terms.
+# See https://github.com/newrelic/newrelic-ruby-agent/blob/main/LICENSE for complete details.
+# frozen_string_literal: true
+
+require 'minitest/autorun'
+
+class GemspecFilesTest < Minitest::Test
+  def test_the_test_agent_helper_is_shipped_in_the_gem_files
+    skip if defined?(Rails::VERSION)
+    skip 'Gemspec test requires a newer version of Rubygems' unless Gem.respond_to?(:open_file)
+
+    gem_spec_file_path = File.expand_path('../../../newrelic_rpm.gemspec', __FILE__)
+
+    Dir.chdir(File.dirname(gem_spec_file_path)) do
+      gem_spec = eval(Gem.open_file(gem_spec_file_path, 'r:UTF-8:-', &:read))
+
+      assert gem_spec, "Failed to parse '#{gem_spec_file_path}'"
+      assert_equal('newrelic_rpm', gem_spec.name)
+      assert_includes(gem_spec.files, 'test/agent_helper.rb')
+    end
+  end
+end