add tests for initial conditions

Author: adrianmcli

index.test.js

@@ -0,0 +1,50 @@
+const { ethers } = require("ethers")
+const Ganache = require("ganache-core")
+
+const MAINNET_NODE_URL = "<insert mainnet node url here>"
+const PRIV_KEY = "<insert ANY private key here>"
+
+const startChain = async () => {
+  const ganache = Ganache.provider({
+    fork: MAINNET_NODE_URL,
+    network_id: 1,
+    accounts: [
+      {
+        secretKey: PRIV_KEY,
+        balance: ethers.utils.hexlify(ethers.utils.parseEther("1000")),
+      },
+    ],
+  })
+
+  const provider = new ethers.providers.Web3Provider(ganache)
+  const wallet = new ethers.Wallet(PRIV_KEY, provider)
+
+  return wallet
+}
+
+const erc20 = require("@studydefi/money-legos/erc20").default
+
+describe("do some tests", () => {
+  let wallet
+
+  beforeAll(async () => {
+    wallet = await startChain()
+  })
+
+  test("initial DAI balance of 0", async () => {
+    const daiContract = new ethers.Contract(
+      erc20.dai.address,
+      erc20.dai.abi,
+      wallet
+    )
+    const daiBalanceWei = await daiContract.balanceOf(wallet.address)
+    const daiBalance = ethers.utils.formatUnits(daiBalanceWei, 18)
+    expect(parseFloat(daiBalance)).toBe(0)
+  })
+
+  test("initial ETH balance of 1000 ETH", async () => {
+    const ethBalanceWei = await wallet.getBalance()
+    const ethBalance = ethers.utils.formatEther(ethBalanceWei)
+    expect(parseFloat(ethBalance)).toBe(1000)
+  })
+})