test: load branch helpers without plugin Composer autoload

Author: somethingwithproof

tests/bootstrap-unit.php

@@ -62,6 +62,8 @@
 require_once $autoload;
 require_once __DIR__ . '/Helpers/CactiStubs.php';
 require_once __DIR__ . '/TestCase.php';
+require_once __DIR__ . '/Helpers/ThresholdOutcome.php';
+require_once __DIR__ . '/Helpers/ThresholdScenario.php';
 
 /*
  * base_path has to point at the Cacti root two levels above this plugin: