Refactoring to address some issues from #5895 (handling of unsigned numbers). Also adding a TODO testcase since the real issue (FP) is still not fixed

test/testtokenlist.cpp

@@ -0,0 +1,49 @@
+/*
+ * Cppcheck - A tool for static C/C++ code analysis
+ * Copyright (C) 2007-2015 Daniel Marjamäki and Cppcheck team.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "testsuite.h"
+#include "settings.h"
+#include "tokenlist.h"
+#include "token.h"
+#include <cstring>
+
+
+class TestTokenList : public TestFixture {
+public:
+    TestTokenList() : TestFixture("TestTokenList") {
+    }
+
+private:
+
+    void run() {
+
+        TEST_CASE(testaddtoken);
+    }
+
+    // inspired by #5895
+    void testaddtoken() {
+        const std::string code = "0x89504e470d0a1a0a";
+        Settings settings;
+        TokenList tokenlist(&settings);
+        tokenlist.addtoken(code, 1, 1, false);
+        ASSERT_EQUALS("9894494448401390090", tokenlist.front()->str());
+    }
+
+};
+
+REGISTER_TEST(TestTokenList)