Update Fastfile with automation to inject Buildkite token

Author: mokagio

fastlane/Fastfile

@@ -1042,6 +1042,11 @@ lane :test_without_building do |options|
     e.include?(options[:name])
   end.first
 
+  # FIXME: I do realize the variable is called "test plan path" but we're
+  # actually dealing with an `xctestrun`. I'll rename them all once established
+  # this approach works
+  add_buildkite_analytics_token(xctestrun_path: testPlanPath)
+
   UI.user_error!('Unable to find .xctestrun file') unless !testPlanPath.nil? && File.exist?((testPlanPath))
 
   run_tests(
@@ -1101,3 +1106,20 @@ def trigger_buildkite_release_build(branch:, beta:)
     pipeline_file: 'release-builds.yml'
   )
 end
+
+def add_buildkite_analytics_token(xctestrun_path:)
+  require 'plist'
+
+  token_key = 'BUILDKITE_ANALYTICS_TOKEN'
+  token = ENV[token_key]
+  return if token.nil?
+
+  xctestrun = Plist.parse_xml(xctestrun_path)
+  xctestrun['TestConfigurations'].each do |configuration|
+    configuration['TestTargets'].each do |target|
+      target['EnvironmentVariables'][token_key] = token
+    end
+  end
+
+  File.write(xctestrun_path, Plist::Emit.dump(xctestrun))
+end