add refundoverflow test

test/stRefundTestFiller.json

@@ -303,6 +303,34 @@
              "secretKey" : "45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8",
              "data" : ""
          }
-     }
+     },
+    "RefundOverflow" : {
+           "env" : {
+               "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
+               "currentDifficulty" : "45678256",
+               "currentGasLimit" : "115792089237316195423570985008687907853269984665640564039457584007913129639935",
+               "currentNumber" : "0",
+               "currentTimestamp" : 1,
+               "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"
+           },
+           "pre" : {
+               "a94f5374fce5edbc8e2a8697c15331677e6ebf0b" : {
+                   "balance" : "400",
+                   "code" : "0x",
+                   "nonce" : "0",
+                   "storage" : {
+                   }
+               }
+           },
+           "transaction" : {
+               "data" : "",
+               "gasLimit" : "5789604461865809771178549250434395392663499233282028201972879200395656482016",
+               "gasPrice" : "20",
+               "nonce" : "0",
+               "secretKey" : "45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8",
+               "to" : "b94f5374fce5edbc8e2a8697c15331677e6ebf0b",
+               "value" : ""
+           }
+       }
 
 }