add unit test related to #931

Author: facontidavide

tests/gtest_factory.cpp

@@ -104,6 +104,13 @@ static const char* xml_text_subtree_part2 = R"(
 
 // clang-format on
 
+TEST(BehaviorTreeFactory, NotRegisteredNode)
+{
+  BehaviorTreeFactory factory;
+  ASSERT_ANY_THROW(factory.createTreeFromText(xml_text));
+  ASSERT_ANY_THROW(std::make_shared<BT::Tree>(factory.createTreeFromText(xml_text)));
+}
+
 TEST(BehaviorTreeFactory, XMLParsingOrder)
 {
   BehaviorTreeFactory factory;