Add a test for a crash in ModelManagerInterface

Task-number: QTCREATORBUG-25350
Change-Id: I4ea31e7936cc77dcd8f3fc494b5ecbd83858a766
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/autotest/autotestunittests.h

@@ -56,6 +56,7 @@ private slots:
     void testCodeParserBoostTest();
     void testCodeParserBoostTest_data();
     void testStringTable();
+    void testModelManagerInterface();
 
 private:
     TestTreeModel *m_model = nullptr;