feat: FlashMintWrapped (#117)

.prettierrc.json

@@ -3,5 +3,18 @@
   "parser": "typescript",
   "tabWidth": 2,
   "trailingComma": "all",
-  "arrowParens": "always"
+  "arrowParens": "always",
+  "overrides": [
+    {
+      "files": "*.sol",
+      "options": {
+        "printWidth": 100,
+        "tabWidth": 2,
+        "useTabs": false,
+        "singleQuote": false,
+        "bracketSpacing": true,
+        "explicitTypes": "always"
+      }
+    }
+  ]
 }

README.md

@@ -28,9 +28,18 @@ yarn
 
 ### Run Contract Tests
 
-`yarn test` to run compiled contracts
+`yarn test` to run compiled contracts (executes on network localhost, you need to have `yarn chain` running)
 
-OR `yarn test:clean` if contracts have been typings need to be updated
+OR `yarn test:clean` if contract typings need to be updated
+
+### Run Integration Tests
+
+`yarn chain:fork:ethereum` in one terminal to run chain fork. replace ethereum with polygon or optimism if needed, see package.json
+
+`yarn test:integration:ethereum` in another terminal, replace chain again as needed
+
+To run an individual test on e.g. a later block, use (replace path):
+`LATESTBLOCK=15508111 INTEGRATIONTEST=true VERBOSE=true npx hardhat test ./test/integration/ethereum/flashMintWrappedIntegration.spec.ts --network localhost`
 
 ### Run Coverage Report for Tests
 

contracts/exchangeIssuance/DEXAdapter.sol

@@ -682,7 +682,13 @@ library DEXAdapter {
         returns (uint256)
     {
         _safeApprove(IERC20(_path[0]), address(_router), _amountIn);
-        return _router.swapExactTokensForTokens(_amountIn, _minAmountOut, _path, address(this), block.timestamp)[1];
+        // NOTE: The following was changed from always returning result at position [1] to returning the last element of the result array
+        // With this change, the actual output is correctly returned also for multi-hop swaps
+        // See https://github.com/IndexCoop/index-coop-smart-contracts/pull/116 
+        uint256[] memory result = _router.swapExactTokensForTokens(_amountIn, _minAmountOut, _path, address(this), block.timestamp);
+        // result = uint[] memory	The input token amount and all subsequent output token amounts.
+        // we are usually only interested in the actual amount of the output token (so result element at the last place)
+        return result[result.length-1];
     }
 
     /**