WIP having InternalCompilerError;

formating synthetic.sol and staking.sol;
Adding MockInstaMapping;
update test;

contracts/connectors/synthetix.sol

@@ -34,7 +34,7 @@ contract SynthetixStakingHelper is DSMath, Stores {
   /**
   * @dev Return Synthetix Token address.
    */
-    function getSnxAddr() internal pure returns (address) {
+  function getSnxAddr() virtual internal view returns (address) {
     return 0xC011a73ee8576Fb46F5E1c5751cA3B9Fe0af2a6F;
   }
 
@@ -45,7 +45,7 @@ contract SynthetixStakingHelper is DSMath, Stores {
     require(bytes(str).length != 0, "string-empty");
     // solium-disable-next-line security/no-inline-assembly
     assembly {
-            result := mload(add(str, 32))
+result := mload(add(str, 32))
     }
   }
 
@@ -53,6 +53,7 @@ contract SynthetixStakingHelper is DSMath, Stores {
    * @dev Get staking data
    */
   function getStakingData(string memory stakingName)
+  virtual
   internal
   view
   returns (

contracts/mapping/staking.sol

@@ -54,7 +54,7 @@ contract Helpers is BytesHelper {
   event LogAddStakingMapping(string stakingName, bytes32 stakingType, address stakingAddress, address stakingToken);
   event LogRemoveStakingMapping(string stakingName, bytes32 stakingType, address stakingAddress, address stakingToken);
 
-    modifier isChief {
+  modifier isChief virtual {
     require(
       ConnectorsInterface(connectors).chief(msg.sender) ||
       IndexInterface(instaIndex).master() == msg.sender, "not-Chief");

contracts/tests/MockInstaMapping.sol

@@ -0,0 +1,7 @@
+pragma solidity ^0.6.0;
+
+import { InstaMapping } from "../mapping/staking.sol";
+
+contract MockInstaMapping is InstaMapping {
+  modifier isChief override {_;}
+}

contracts/tests/MockSynthetix.sol

@@ -9,9 +9,9 @@ contract MockSynthetixStaking is ConnectSynthetixStaking{
     synthetixStakingAddr = _synthetixStakingAddr;
   }
 
-  function getSynthetixStakingAddr(address token) override internal returns (address) {
+  // function getSynthetixStakingAddr(address token) override internal returns (address) {
-    return synthetixStakingAddr;
+  //   return synthetixStakingAddr;
-  }
+  // }
 
   function emitEvent(bytes32 eventCode, bytes memory eventData) override internal {}
 

test/SynthetixProtocol.js

@@ -8,20 +8,22 @@ const {
 
 const MockContract = artifacts.require("MockContract");
 const MockSynthetixStaking = artifacts.require('MockSynthetixStaking');
-// const ConnectSynthetixStaking = artifacts.require('ConnectSynthetixStaking');
+const MockInstaMapping = artifacts.require('MockInstaMapping');
 const erc20ABI = require("./abi/erc20.js");
 const synthetixStaking = require("./abi/synthetixStaking.json");
 
 contract('ConnectSynthetixStaking', async accounts => {
   const [sender, receiver] =  accounts;
   let mock, mockSynthetixStaking, stakingContract, token;
+  let instaMapping;
 
   before(async function () {
-    // const connectSynthetixStaking = await ConnectSynthetixStaking.deployed();
     mock = await MockContract.new();
+    mockInstaMapping = await MockInstaMapping.new();
     mockSynthetixStaking = await MockSynthetixStaking.new(mock.address);
     stakingContract = new web3.eth.Contract(synthetixStaking, mock.address);
     token = new web3.eth.Contract(erc20ABI, mock.address);
+    mockInstaMapping.addStakingMapping('snx', mock.address, mock.address);
 
     // mocking balanceOf
     let balanceOf = await token.methods.balanceOf(mockSynthetixStaking.address).encodeABI();