diff --git a/generator/tests/jsongenerator.cpp b/generator/tests/jsongenerator.cpp
index ebb2a00..b1d0150 100644
--- a/generator/tests/jsongenerator.cpp
+++ b/generator/tests/jsongenerator.cpp
@@ -128,8 +128,8 @@ void JsonGeneratorTests::testNesting()
     NestedTestStruct nested;
     nested.nested.emplace_front(vector<TestStruct>{ test });
     nested.deq.emplace_back(3.14);
-    const string expectedJSON(
-        "{\"nested\":[[{\"someInt\":42,\"someString\":\"the answer\",\"yetAnotherString\":\"but what was the question\"}]],\"deq\":[3.14]}");
+    const string expectedJSON("{\"nested\":[[{\"someInt\":42,\"someString\":\"the answer\",\"yetAnotherString\":\"but what was the "
+                              "question\"}]],\"ptr\":null,\"deq\":[3.14]}");
 
     // test serialization
     CPPUNIT_ASSERT_EQUAL(expectedJSON, string(nested.toJson().GetString()));
diff --git a/generator/tests/structs.h b/generator/tests/structs.h
index bdd3ca7..0965e90 100644
--- a/generator/tests/structs.h
+++ b/generator/tests/structs.h
@@ -39,6 +39,7 @@ struct NestedTestStruct : public JsonSerializable<NestedTestStruct> {
     friend class JsonGeneratorTests;
 
     list<vector<TestStruct>> nested;
+    unique_ptr<TestStruct> ptr;
 
 private:
     deque<double> deq;