ZapSwapCurve test for ETH wrapping (#244)

Author: Padraic-O-Mhuiris

cSpell.json

@@ -78,6 +78,7 @@
         "TYPEHASH",
         "visualstudio",
         "vsmarketplacebadge",
+        "Vyper",
         "weth",
         "withdrawweth",
         "Yasset",

test/helpers/constants.ts

@@ -1,6 +1,6 @@
-import { ethers, waffle } from "hardhat";
+import { ethers } from "hardhat";
 
 export const _ETH_CONSTANT = "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE";
 
 export const ONE_ETH = ethers.constants.WeiPerEther;
-export const ZERO = ethers.constants.Zero;
+export const { Zero } = ethers.constants;