diff --git a/src/test.cpp b/src/test.cpp
index f8d27e8..6ece7f8 100644
--- a/src/test.cpp
+++ b/src/test.cpp
@@ -834,6 +834,9 @@ private:
 
 const std::string json = R"({
     "a number": 12345,
+    "true": true,
+    "false": false,
+    "null": null,
     "glossary": {
         "title": "example glossary",
 		"GlossDiv": {