private static HashSet <SkillNode> DecodeInSkillTree(string buildUrl)
{
// SkillTree.DecodeUrl accesses static state that should be reset between tests
SkillTree.ClearAssets();
_tree = SkillTree.CreateAsync(_persistentData).Result;
HashSet <SkillNode> nodes;
SkillTree.DecodeUrl(buildUrl, out nodes, _tree);
return(nodes);
}