Added testcase for #807 (cppcheck crashes scanning ruby 1.9.1)

test/testtokenize.cpp

@@ -81,6 +81,7 @@ private:
         TEST_CASE(simplifyKnownVariables13);
         TEST_CASE(simplifyKnownVariables14);
         TEST_CASE(simplifyKnownVariables15);
+        TEST_CASE(simplifyKnownVariables16);
 
         TEST_CASE(match1);
 
@@ -829,6 +830,13 @@ private:
         }
     }
 
+    void simplifyKnownVariables16()
+    {
+        // ticket #807 - segmentation fault when macro isn't found
+        const char code[] = "void f ( ) { int n = 1; DISPATCH(while); }";
+        simplifyKnownVariables(code);
+    }
+
     void match1()
     {
         // Match "%var% | %var%"