add mock contract for testing

MAX_RATE as expected

Author: ilanDoron

contracts/mock/MockKyberReserveHighRate.sol

@@ -0,0 +1,25 @@
+pragma solidity 0.4.18;
+
+import "../reserves/KyberReserveHighRate.sol";
+
+/// @title Kyber Reserve contract
+/// reuses KyberReserve.sol contract while overriding a few functions / values.
+/// Update MAX_RATE to higher value and should have maximum code reuse
+contract MockKyberReserveHighRate is KyberReserveHighRate {
+
+    function MockKyberReserveHighRate(address _kyberNetwork, ConversionRatesInterface _ratesContract,
+        address _admin) public KyberReserveHighRate(_kyberNetwork, _ratesContract, _admin)
+        { }
+
+    function MockCalcDstQty(uint srcQty, uint srcDecimals, uint dstDecimals, uint rate)
+        public pure returns(uint)
+    {
+        return calcDstQty(srcQty, srcDecimals, dstDecimals, rate);
+    }
+
+    function MockCalcSrcQty(uint dstQty, uint srcDecimals, uint dstDecimals, uint rate)
+        public pure returns(uint) 
+    {
+        return calcSrcQty(dstQty, srcDecimals, dstDecimals, rate);
+    }
+}

test/v4/kyberReserveHighRate.js

@@ -1,7 +1,7 @@
-const ConversionRates = artifacts.require("ConversionRates.sol");
-const EnhancedStepFunctions = artifacts.require("MockEnhancedStepFunctions.sol");
-const TestToken = artifacts.require("TestToken.sol");
-const Reserve = artifacts.require("KyberReserveHighRate.sol");
+const ConversionRates = artifacts.require("ConversionRates");
+const EnhancedStepFunctions = artifacts.require("MockEnhancedStepFunctions");
+const TestToken = artifacts.require("TestToken");
+const Reserve = artifacts.require("MockKyberReserveHighRate");
 const SanityRates = artifacts.require("SanityRates");
 
 const Helper = require("./helper.js");
@@ -14,6 +14,7 @@ const ethAddress = '0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE';
 const zeroAddress = '0x0000000000000000000000000000000000000000';
 const precision = new BN(10).pow(new BN(18));
 const maxAllowance = new BN(2).pow(new BN(255));
+const MAX_RATE =  precisionUnits.mul(new BN(10 ** 7));
 
 //balances
 let expectedReserveBalanceWei = new BN(0);
@@ -237,6 +238,44 @@ contract('KyberReserveHighRate', function(accounts) {
         }
     });
 
+    it("test MAX_RATE as expected for internal calcDstQty", async function() {
+        const srcQty = new BN(5000);
+        const decimals = 18;
+        let rate = MAX_RATE;
+
+        const expectedDstQty = Helper.calcDstQty(srcQty, decimals, decimals, rate);
+
+        const rxDestQty = await reserveInst.MockCalcDstQty(srcQty, decimals, decimals, rate);
+        Helper.assertEqual(expectedDstQty, rxDestQty);
+
+        rate = MAX_RATE.add(new BN(1));
+        try {
+            await reserveInst.MockCalcDstQty(srcQty, decimals, decimals, rate);
+            assert(false,  "shouldn't reach this line. expected line above to throw.")
+        } catch(e) {
+            assert(Helper.isRevertErrorMessage(e), "expected throw but got: " + e);
+        }
+    });
+
+    it("test MAX_RATE as expected for internal calcSrcQty", async function() {
+        const dstQty = new BN(50000000000);
+        const decimals = 18;
+        let rate = MAX_RATE;
+
+        const expectedSrcQty = Helper.calcSrcQty(dstQty, decimals, decimals, rate);
+
+        const rxSrcQty = await reserveInst.MockCalcSrcQty(dstQty, decimals, decimals, rate);
+        Helper.assertEqual(expectedSrcQty, rxSrcQty);
+
+        rate = MAX_RATE.add(new BN(1));
+        try {
+            await reserveInst.MockCalcSrcQty(dstQty, decimals, decimals, rate);
+            assert(false,  "shouldn't reach this line. expected line above to throw.")
+        } catch(e) {
+            assert(Helper.isRevertErrorMessage(e), "expected throw but got: " + e);
+        }
+    });
+
     it("should perform small buy (no steps) and check: balances changed, rate is expected rate.", async function () {
         let tokenInd = 3;
         let token = tokens[tokenInd]; //choose some token