feat:Add Kyber Elastic mixins (#677)

* add kyber elastic mixins

* update changelog

* fix changelog

contracts/zero-ex/CHANGELOG.json

@@ -1,4 +1,12 @@
 [
+    {
+        "version": "0.39.1",
+        "changes": [
+            {
+                "note": "Add KyberElastic mixin for Optimism and BSC"
+            }
+        ]
+    },
     {
         "version": "0.39.0",
         "changes": [

contracts/zero-ex/contracts/src/transformers/bridges/BSCBridgeAdapter.sol

@@ -21,6 +21,7 @@ import "./mixins/MixinCurve.sol";
 import "./mixins/MixinDodo.sol";
 import "./mixins/MixinDodoV2.sol";
 import "./mixins/MixinKyberDmm.sol";
+import "./mixins/MixinKyberElastic.sol";
 import "./mixins/MixinMooniswap.sol";
 import "./mixins/MixinNerve.sol";
 import "./mixins/MixinUniswapV2.sol";
@@ -33,6 +34,7 @@ contract BSCBridgeAdapter is
     MixinDodo,
     MixinDodoV2,
     MixinKyberDmm,
+    MixinKyberElastic,
     MixinMooniswap,
     MixinNerve,
     MixinUniswapV2,
@@ -84,6 +86,11 @@ contract BSCBridgeAdapter is
                 return (0, true);
             }
             boughtAmount = _tradeKyberDmm(buyToken, sellAmount, order.bridgeData);
+        } else if (protocolId == BridgeProtocols.KYBERELASTIC) {
+            if (dryRun) {
+                return (0, true);
+            }
+            boughtAmount = _tradeKyberElastic(sellToken, sellAmount, order.bridgeData);
         } else if (protocolId == BridgeProtocols.WOOFI) {
             if (dryRun) {
                 return (0, true);

contracts/zero-ex/contracts/src/transformers/bridges/OptimismBridgeAdapter.sol

@@ -21,6 +21,7 @@ import "./mixins/MixinAaveV3.sol";
 import "./mixins/MixinBalancerV2Batch.sol";
 import "./mixins/MixinCurve.sol";
 import "./mixins/MixinCurveV2.sol";
+import "./mixins/MixinKyberElastic.sol";
 import "./mixins/MixinNerve.sol";
 import "./mixins/MixinSolidly.sol";
 import "./mixins/MixinSynthetix.sol";
@@ -34,6 +35,7 @@ contract OptimismBridgeAdapter is
     MixinBalancerV2Batch,
     MixinCurve,
     MixinCurveV2,
+    MixinKyberElastic,
     MixinNerve,
     MixinSynthetix,
     MixinUniswapV3,
@@ -102,6 +104,11 @@ contract OptimismBridgeAdapter is
                 return (0, true);
             }
             boughtAmount = _tradeWOOFi(sellToken, buyToken, sellAmount, order.bridgeData);
+        } else if (protocolId == BridgeProtocols.KYBERELASTIC) {
+            if (dryRun) {
+                return (0, true);
+            }
+            boughtAmount = _tradeKyberElastic(sellToken, sellAmount, order.bridgeData);
         }
 
         emit BridgeFill(order.source, sellToken, buyToken, sellAmount, boughtAmount);

contracts/zero-ex/tests/forked/SwapERC20ForERC20Test.t.sol

@@ -38,8 +38,8 @@ contract SwapERC20ForERC20Test is Test, ForkUtils, TestUtils {
 
     function test_swapERC20ForERC20OnKyberElastic() public {
         for (uint256 i = 0; i < chains.length; i++) {
-            // kyberelastic mixin not deployed to these chains yet (bsc, fantom, optimism)
+            // kyberelastic mixin not added to fantom yet
-            if (i == 1 || i == 4 || i == 5) {
+            if (i == 4) {
                 continue;
             }
             vm.selectFork(forkIds[chains[i]]);