L2EthToken Tests

system-contracts/test/L2EthToken.spec.ts

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+import { expect } from "chai";
+import { ethers, network } from "hardhat";
+import type { Wallet } from "zksync-web3";
+import type { L2EthToken } from "../typechain";
+import { L2EthTokenFactory } from "../typechain";
+import { deployContractOnAddress, getWallets, loadArtifact, provider } from "./shared/utils";
+import type { BigNumber } from "ethers";
+import { TEST_BOOTLOADER_FORMAL_ADDRESS, TEST_ETH_TOKEN_SYSTEM_CONTRACT_ADDRESS } from "./shared/constants";
+import { prepareEnvironment, setResult } from "./shared/mocks";
+import { randomBytes } from "crypto";
+
+describe("L2EthToken tests", () => {
+  const richWallet = getWallets()[0];
+  let wallets: Array<Wallet>;
+  let l2EthToken: L2EthToken;
+  let bootloaderAccount: ethers.Signer;
+  let mailboxIface: ethers.utils.Interface;
+
+  before(async () => {
+    await prepareEnvironment();
+    await deployContractOnAddress(TEST_ETH_TOKEN_SYSTEM_CONTRACT_ADDRESS, "L2EthToken");
+    l2EthToken = L2EthTokenFactory.connect(TEST_ETH_TOKEN_SYSTEM_CONTRACT_ADDRESS, richWallet);
+    bootloaderAccount = await ethers.getImpersonatedSigner(TEST_BOOTLOADER_FORMAL_ADDRESS);
+    mailboxIface = new ethers.utils.Interface((await loadArtifact("IMailbox")).abi);
+  });
+
+  beforeEach(async () => {
+    wallets = Array.from({ length: 2 }, () => ethers.Wallet.createRandom().connect(provider));
+  });
+
+  after(async function () {
+    await network.provider.request({
+      method: "hardhat_stopImpersonatingAccount",
+      params: [TEST_BOOTLOADER_FORMAL_ADDRESS],
+    });
+  });
+
+  describe("mint", () => {
+    it("called by bootlader", async () => {
+      const initialSupply: BigNumber = await l2EthToken.totalSupply();
+      const initialBalanceOfWallet: BigNumber = await l2EthToken.balanceOf(wallets[0].address);
+      const amountToMint: BigNumber = ethers.utils.parseEther("10.0");
+
+      await expect(l2EthToken.connect(bootloaderAccount).mint(wallets[0].address, amountToMint))
+        .to.emit(l2EthToken, "Mint")
+        .withArgs(wallets[0].address, amountToMint);
+
+      const finalSupply: BigNumber = await l2EthToken.totalSupply();
+      const balanceOfWallet: BigNumber = await l2EthToken.balanceOf(wallets[0].address);
+      expect(finalSupply).to.equal(initialSupply.add(amountToMint));
+      expect(balanceOfWallet).to.equal(initialBalanceOfWallet.add(amountToMint));
+    });
+
+    it("not called by bootloader", async () => {
+      const amountToMint: BigNumber = ethers.utils.parseEther("10.0");
+      await expect(l2EthToken.connect(wallets[0]).mint(wallets[0].address, amountToMint)).to.be.rejectedWith(
+        "Callable only by the bootloader"
+      );
+    });
+  });
+
+  describe("transfer", () => {
+    it("transfer successfully", async () => {
+      await (
+        await l2EthToken.connect(bootloaderAccount).mint(wallets[0].address, ethers.utils.parseEther("100.0"))
+      ).wait();
+
+      const senderBalanceBeforeTransfer: BigNumber = await l2EthToken.balanceOf(wallets[0].address);
+      const recipientBalanceBeforeTransfer: BigNumber = await l2EthToken.balanceOf(wallets[1].address);
+
+      const amountToTransfer = ethers.utils.parseEther("10.0");
+
+      await expect(
+        l2EthToken.connect(bootloaderAccount).transferFromTo(wallets[0].address, wallets[1].address, amountToTransfer)
+      )
+        .to.emit(l2EthToken, "Transfer")
+        .withArgs(wallets[0].address, wallets[1].address, amountToTransfer);
+
+      const senderBalanceAfterTransfer: BigNumber = await l2EthToken.balanceOf(wallets[0].address);
+      const recipientBalanceAfterTransfer: BigNumber = await l2EthToken.balanceOf(wallets[1].address);
+      expect(senderBalanceAfterTransfer).to.be.eq(senderBalanceBeforeTransfer.sub(amountToTransfer));
+      expect(recipientBalanceAfterTransfer).to.be.eq(recipientBalanceBeforeTransfer.add(amountToTransfer));
+    });
+
+    it("no tranfser due to insufficient balance", async () => {
+      await (
+        await l2EthToken.connect(bootloaderAccount).mint(wallets[0].address, ethers.utils.parseEther("5.0"))
+      ).wait();
+      const amountToTransfer: BigNumber = ethers.utils.parseEther("6.0");
+
+      await expect(
+        l2EthToken.connect(bootloaderAccount).transferFromTo(wallets[0].address, wallets[1].address, amountToTransfer)
+      ).to.be.rejectedWith("Transfer amount exceeds balance");
+    });
+
+    it("no transfer - require special access", async () => {
+      const maliciousWallet: Wallet = ethers.Wallet.createRandom().connect(provider);
+      await (
+        await l2EthToken.connect(bootloaderAccount).mint(maliciousWallet.address, ethers.utils.parseEther("20.0"))
+      ).wait();
+
+      const amountToTransfer: BigNumber = ethers.utils.parseEther("20.0");
+
+      await expect(
+        l2EthToken
+          .connect(maliciousWallet)
+          .transferFromTo(maliciousWallet.address, wallets[1].address, amountToTransfer)
+      ).to.be.rejectedWith("Only system contracts with special access can call this method");
+    });
+  });
+
+  describe("balanceOf", () => {
+    it("walletFrom address", async () => {
+      const amountToMint: BigNumber = ethers.utils.parseEther("10.0");
+
+      await l2EthToken.connect(bootloaderAccount).mint(wallets[0].address, amountToMint);
+      const balance = await l2EthToken.balanceOf(wallets[0].address);
+      expect(balance).to.equal(amountToMint);
+    });
+
+    it("address larger than 20 bytes", async () => {
+      const amountToMint: BigNumber = ethers.utils.parseEther("123.0");
+
+      const res = await l2EthToken.connect(bootloaderAccount).mint(wallets[0].address, amountToMint);
+      await res.wait();
+      const largerAddress = ethers.BigNumber.from(
+        "0x" + randomBytes(12).toString("hex") + wallets[0].address.slice(2)
+      ).toHexString();
+      const balance = await l2EthToken.balanceOf(largerAddress);
+
+      expect(balance).to.equal(amountToMint);
+    });
+  });
+
+  describe("totalSupply", () => {
+    it("correct total supply", async () => {
+      const totalSupplyBefore = await l2EthToken.totalSupply();
+      const amountToMint: BigNumber = ethers.utils.parseEther("10.0");
+
+      await l2EthToken.connect(bootloaderAccount).mint(wallets[0].address, amountToMint);
+      const totalSupply = await l2EthToken.totalSupply();
+
+      expect(totalSupply).to.equal(totalSupplyBefore.add(amountToMint));
+    });
+  });
+
+  describe("name", () => {
+    it("correct name", async () => {
+      const name = await l2EthToken.name();
+      expect(name).to.equal("Ether");
+    });
+  });
+
+  describe("symbol", () => {
+    it("correct symbol", async () => {
+      const symbol = await l2EthToken.symbol();
+      expect(symbol).to.equal("ETH");
+    });
+  });
+
+  describe("decimals", () => {
+    it("correct decimals", async () => {
+      const decimals = await l2EthToken.decimals();
+      expect(decimals).to.equal(18);
+    });
+  });
+
+  describe("withdraw", () => {
+    it("event, balance, totalsupply", async () => {
+      const amountToWithdraw: BigNumber = ethers.utils.parseEther("1.0");
+      const message: string = ethers.utils.solidityPack(
+        ["bytes4", "address", "uint256"],
+        [mailboxIface.getSighash("finalizeEthWithdrawal"), wallets[1].address, amountToWithdraw]
+      );
+
+      await setResult("L1Messenger", "sendToL1", [message], {
+        failure: false,
+        returnData: ethers.utils.defaultAbiCoder.encode(["bytes32"], [ethers.utils.keccak256(message)]),
+      });
+
+      // To prevent underflow since initial values are 0's and we are substracting from them
+      const amountToMint: BigNumber = ethers.utils.parseEther("100.0");
+      await (await l2EthToken.connect(bootloaderAccount).mint(l2EthToken.address, amountToMint)).wait();
+
+      const balanceBeforeWithdrawal: BigNumber = await l2EthToken.balanceOf(l2EthToken.address);
+      const totalSupplyBefore = await l2EthToken.totalSupply();
+
+      await expect(l2EthToken.connect(richWallet).withdraw(wallets[1].address, { value: amountToWithdraw }))
+        .to.emit(l2EthToken, "Withdrawal")
+        .withArgs(richWallet.address, wallets[1].address, amountToWithdraw);
+
+      const balanceAfterWithdrawal: BigNumber = await l2EthToken.balanceOf(l2EthToken.address);
+      const totalSupplyAfter = await l2EthToken.totalSupply();
+
+      expect(balanceAfterWithdrawal).to.equal(balanceBeforeWithdrawal.sub(amountToWithdraw));
+      expect(totalSupplyAfter).to.equal(totalSupplyBefore.sub(amountToWithdraw));
+    });
+
+    it("event, balance, totalsupply, withdrawWithMessage", async () => {
+      const amountToWithdraw: BigNumber = ethers.utils.parseEther("1.0");
+      const additionalData: string = ethers.utils.defaultAbiCoder.encode(["string"], ["additional data"]);
+      const message: string = ethers.utils.solidityPack(
+        ["bytes4", "address", "uint256", "address", "bytes"],
+        [
+          mailboxIface.getSighash("finalizeEthWithdrawal"),
+          wallets[1].address,
+          amountToWithdraw,
+          richWallet.address,
+          additionalData,
+        ]
+      );
+
+      await setResult("L1Messenger", "sendToL1", [message], {
+        failure: false,
+        returnData: ethers.utils.defaultAbiCoder.encode(["bytes32"], [ethers.utils.keccak256(message)]),
+      });
+
+      // Consitency reasons - won't crash if test order reverse
+      const amountToMint: BigNumber = ethers.utils.parseEther("100.0");
+      await (await l2EthToken.connect(bootloaderAccount).mint(l2EthToken.address, amountToMint)).wait();
+
+      const totalSupplyBefore = await l2EthToken.totalSupply();
+      const balanceBeforeWithdrawal: BigNumber = await l2EthToken.balanceOf(l2EthToken.address);
+      await expect(
+        l2EthToken.connect(richWallet).withdrawWithMessage(wallets[1].address, additionalData, {
+          value: amountToWithdraw,
+        })
+      )
+        .to.emit(l2EthToken, "WithdrawalWithMessage")
+        .withArgs(richWallet.address, wallets[1].address, amountToWithdraw, additionalData);
+      const totalSupplyAfter = await l2EthToken.totalSupply();
+      const balanceAfterWithdrawal: BigNumber = await l2EthToken.balanceOf(l2EthToken.address);
+      expect(balanceAfterWithdrawal).to.equal(balanceBeforeWithdrawal.sub(amountToWithdraw));
+      expect(totalSupplyAfter).to.equal(totalSupplyBefore.sub(amountToWithdraw));
+    });
+  });
+});