Merge pull request #587 from keep-network/rewards-cap-tests

Rewards cap tests

Adding tests around the maximum cap rewards per ECDSA keep operator.

Author: pdyraga

solidity/contracts/ECDSARewards.sol

@@ -90,7 +90,7 @@ contract ECDSARewards is Rewards {
     // The amount of tokens each individual beneficiary address
     // can receive in a single interval is capped.
     // TODO: set actual value
-    uint256 internal constant beneficiaryRewardCap = 400000 * 10**18;
+    uint256 internal beneficiaryRewardCap = 400000 * 10**18;
     // The total amount of rewards allocated to the given beneficiary address,
     // in the given interval.
     // `allocatedRewards[beneficiary][interval] -> amount`

solidity/contracts/test/ECDSARewardsStub.sol

@@ -0,0 +1,27 @@
+pragma solidity 0.5.17;
+
+import "../../contracts/ECDSARewards.sol";
+
+/// @title ECDSA Rewards Stub for ecdsa rewards testing
+/// @dev This contract is for testing purposes only.
+contract ECDSARewardsStub is ECDSARewards {
+
+    uint256 internal tokenDecimalMultiplier = 10**18;
+
+    constructor(
+        address _token,
+        address payable _factoryAddress,
+        address _tokenStakingAddress
+    )
+        public
+        ECDSARewards(
+            _token,
+            _factoryAddress,
+            _tokenStakingAddress
+        )
+    {}
+
+    function setBeneficiaryRewardCap(uint256 _beneficiaryRewardCap) public {
+        beneficiaryRewardCap = _beneficiaryRewardCap.mul(tokenDecimalMultiplier);
+    }
+}