fixing bugs

contracts/staking/contracts/test/TestStaking.sol

@@ -67,69 +67,6 @@ contract TestStaking is
         cumulativeRewards = _cumulativeRewardsByPool[poolId][lastStoredEpoch];
     }
 
-    function computeMemberRewardOverInterval(
-        bytes32 poolId,
-        uint256 memberStakeOverInterval,
-        uint256 beginEpoch,
-        uint256 endEpoch
-    )
-        external
-        view
-        returns (uint256 reward)
-    {
-        // Sanity check if we can skip computation, as it will result in zero.
-        if (memberStakeOverInterval == 0 || beginEpoch == endEpoch) {
-            return 0;
-        }
-
-        // Sanity check interval
-        require(beginEpoch < endEpoch, "CR_INTERVAL_INVALID");
-
-        // Sanity check begin reward
-        IStructs.Fraction memory beginReward = getCumulativeRewardAtEpoch(poolId, beginEpoch);
-        IStructs.Fraction memory endReward = getCumulativeRewardAtEpoch(poolId, endEpoch);
-
-        // Compute reward
-        reward = LibFractions.scaleDifference(
-            endReward.numerator,
-            endReward.denominator,
-            beginReward.numerator,
-            beginReward.denominator,
-            memberStakeOverInterval
-        );
-    }
-
-    function getCumulativeRewardAtEpoch(bytes32 poolId, uint256 epoch)
-        public
-        view
-        returns (IStructs.Fraction memory cumulativeReward)
-    {
-        // Return CR at `epoch`, given it's set.
-        cumulativeReward = _cumulativeRewardsByPool[poolId][epoch];
-        if (_isCumulativeRewardSet(cumulativeReward)) {
-            return cumulativeReward;
-        }
-
-        // Return CR at `epoch-1`, given it's set.
-        uint256 lastEpoch = epoch.safeSub(1);
-        cumulativeReward = _cumulativeRewardsByPool[poolId][lastEpoch];
-        if (_isCumulativeRewardSet(cumulativeReward)) {
-            return cumulativeReward;
-        }
-
-        // Return the most recent CR, given it's less than `epoch`.
-        uint256 mostRecentEpoch = _cumulativeRewardsByPoolLastStored[poolId];
-        if (mostRecentEpoch < epoch) {
-            cumulativeReward = _cumulativeRewardsByPool[poolId][mostRecentEpoch];
-            if (_isCumulativeRewardSet(cumulativeReward)) {
-                return cumulativeReward;
-            }
-        }
-
-        // Otherwise return an empty CR.
-        return IStructs.Fraction(0, 1);
-    }
-
     /// @dev Overridden to use testWethAddress;
     function getWethContract()
         public