example: get revert msgs for hardhat (#841)

* example: get revert msgs for hardhat

* fix: remove chai-as-promised dep and logic

* re-add @types/mocha and @types/chai

* Update examples/hardhat/package.json
Co-authored-by: smartcontracts <kelvinfichter@gmail.com>

examples/hardhat/hardhat.config.js

 require('@nomiclabs/hardhat-ethers')
 require('@nomiclabs/hardhat-waffle')
 require('hardhat-deploy')
-require("@eth-optimism/hardhat-ovm")
+require('@eth-optimism/hardhat-ovm')
 
 module.exports = {
   networks: {

examples/hardhat/package.json

@@ -14,18 +14,18 @@
     "clean": "rimraf ./cache-ovm ./cache ./artifacts-ovm ./artifacts ./deployments"
   },
   "devDependencies": {
-    "@eth-optimism/hardhat-ovm": "^0.2.0",
     "@nomiclabs/hardhat-ethers": "^2.0.1",
     "@nomiclabs/hardhat-waffle": "^2.0.1",
     "@types/chai": "4.2.17",
-    "@types/chai-as-promised": "^7.1.3",
     "@types/mocha": "^8.2.2",
     "chai": "4.3.4",
-    "chai-as-promised": "^7.1.1",
     "ethereum-waffle": "^3.3.0",
     "ethers": "^5.1.4",
     "hardhat": "^2.2.0",
     "hardhat-deploy": "^0.7.5",
     "mocha": "^8.2.1"
+  },
+  "dependencies": {
+    "@eth-optimism/hardhat-ovm": "^0.2.0"
   }
 }

examples/hardhat/test/erc20.test.js

 /* External Imports */
-const { ethers } = require('hardhat')
-const { expect } = require('chai')
+const { ethers, network } = require('hardhat')
+const chai = require('chai')
+const { solidity } = require('ethereum-waffle')
+const { expect } = chai
 
+chai.use(solidity)
 
 describe(`ERC20`, () => {
   const INITIAL_SUPPLY = 1000000
@@ -43,15 +46,15 @@ describe(`ERC20`, () => {
     it(`should revert when the sender does not have enough balance`, async () => {
       const tx = ERC20.connect(account1).transfer(
         await account2.getAddress(),
-        INITIAL_SUPPLY + 1,
+        INITIAL_SUPPLY + 1
       )
-      await expect(tx).to.be.reverted
+      await expect(tx).to.be.revertedWith("You don't have enough balance to make this transfer!")
     })
 
     it(`should succeed when the sender has enough balance`, async () => {
       const tx = await ERC20.connect(account1).transfer(
         await account2.getAddress(),
-        INITIAL_SUPPLY,
+        INITIAL_SUPPLY
       )
       await tx.wait()
 
@@ -73,22 +76,22 @@ describe(`ERC20`, () => {
       const tx = ERC20.connect(account2).transferFrom(
         await account1.getAddress(),
         await account2.getAddress(),
-        INITIAL_SUPPLY,
+        INITIAL_SUPPLY
       )
-      await expect(tx).to.be.reverted
+      await expect(tx).to.be.revertedWith("Can't transfer from the desired account because you don't have enough of an allowance.")
     })
 
     it(`should succeed when the owner has enough balance and the sender has a large enough allowance`, async () => {
       const tx1 = await ERC20.connect(account1).approve(
         await account2.getAddress(),
-        INITIAL_SUPPLY,
+        INITIAL_SUPPLY
       )
       await tx1.wait()
 
       const tx2 = await ERC20.connect(account2).transferFrom(
         await account1.getAddress(),
         await account2.getAddress(),
-        INITIAL_SUPPLY,
+        INITIAL_SUPPLY
       )
       await tx2.wait()