test: add a fork test for MoveDebtOperator

tests/fork/MoveDebtOperator.ts

@@ -0,0 +1,101 @@
+import { loadFixture } from "@nomicfoundation/hardhat-network-helpers";
+import { expect } from "chai";
+import { parseEther, parseUnits } from "ethers/lib/utils";
+import { ethers } from "hardhat";
+import { SignerWithAddress } from "hardhat-deploy-ethers/signers";
+
+import {
+  IERC20,
+  IERC20__factory,
+  MoveDebtDelegate,
+  MoveDebtOperator,
+  MoveDebtOperator__factory,
+} from "../../typechain";
+import { forking, initMainnetUser } from "./utils";
+
+interface MoveDebtOperatorFixture {
+  moveDebtOperator: MoveDebtOperator;
+  usdt: IERC20;
+  busd: IERC20;
+}
+
+forking({ bscmainnet: 34341800 } as const, addresses => {
+  const executeVip215 = async () => {
+    const timelock = await initMainnetUser(addresses.NormalTimelock, parseEther("1"));
+    const comptrollerAbi = [
+      "function _setPendingImplementation(address) external",
+      "function _become(address) external",
+      "function setDelegateForBNBHacker(address) external",
+      "function comptrollerImplementation() external view returns (address)",
+      "function approvedDelegates(address, address) external view returns (bool)",
+    ];
+
+    const comptroller = await ethers.getContractAt(comptrollerAbi, "0xfD36E2c2a6789Db23113685031d7F16329158384");
+    const intermediateImpl = await ethers.getContractAt(comptrollerAbi, "0xAE37464537fDa217258Bb2Cd70e4f8ffC7E95790");
+    const currentImpl = await ethers.getContractAt(comptrollerAbi, "0xD93bFED40466c9A9c3E7381ab335a08807318a1b");
+
+    await comptroller.connect(timelock)._setPendingImplementation("0xAE37464537fDa217258Bb2Cd70e4f8ffC7E95790");
+    await intermediateImpl.connect(timelock)._become("0xfD36E2c2a6789Db23113685031d7F16329158384");
+    await comptroller.connect(timelock).setDelegateForBNBHacker("0x89621C48EeC04A85AfadFD37d32077e65aFe2226");
+    await comptroller.connect(timelock)._setPendingImplementation("0xD93bFED40466c9A9c3E7381ab335a08807318a1b");
+    await currentImpl.connect(timelock)._become("0xfD36E2c2a6789Db23113685031d7F16329158384");
+  };
+
+  const moveDebtOperatorFixture = async (): Promise<MoveDebtOperatorFixture> => {
+    const USDT_HOLDER = "0x8894E0a0c962CB723c1976a4421c95949bE2D4E3";
+    const [admin] = await ethers.getSigners();
+
+    await executeVip215();
+
+    const usdt = IERC20__factory.connect(addresses.USDT, admin);
+    const busd = IERC20__factory.connect(addresses.BUSD, admin);
+
+    const usdtHolder = await initMainnetUser(USDT_HOLDER, parseEther("1"));
+    await usdt.connect(usdtHolder).transfer(admin.address, parseUnits("1000", 18));
+
+    const moveDebtOperatorFactory = await ethers.getContractFactory<MoveDebtOperator__factory>("MoveDebtOperator");
+    const moveDebtOperator = await moveDebtOperatorFactory.deploy(
+      addresses.PancakeSwapRouter,
+      addresses.MoveDebtDelegate,
+    );
+    return { moveDebtOperator, usdt, busd };
+  };
+
+  describe("MoveDebtOperator", () => {
+    const BUSD_BORROWER = "0x1F6D66bA924EBF554883Cf84d482394013eD294B";
+    const BNB_EXPLOITER = "0x489A8756C18C0b8B24EC2a2b9FF3D4d447F79BEc";
+
+    let admin: SignerWithAddress;
+    let busd: IERC20;
+    let usdt: IERC20;
+    let moveDebtOperator: MoveDebtOperator;
+    let moveDebtDelegate: MoveDebtDelegate;
+
+    beforeEach(async () => {
+      [admin] = await ethers.getSigners();
+      ({ moveDebtOperator, busd, usdt } = await loadFixture(moveDebtOperatorFixture));
+      moveDebtDelegate = await ethers.getContractAt("MoveDebtDelegate", addresses.MoveDebtDelegate);
+    });
+
+    it("should work with a single-hop path from BUSD to USDT", async () => {
+      const path = ethers.utils.hexlify(ethers.utils.concat([addresses.BUSD, "0x000064", addresses.USDT]));
+      await usdt.connect(admin).approve(moveDebtOperator.address, parseUnits("100", 18));
+      const repayAmount = parseUnits("30000", 18);
+      const maxUsdtToSpend = parseUnits("30", 18);
+      const tx = await moveDebtOperator
+        .connect(admin)
+        .moveDebt(BUSD_BORROWER, repayAmount, addresses.vUSDT, maxUsdtToSpend, path);
+      await expect(tx)
+        .to.emit(moveDebtDelegate, "DebtMoved")
+        .withArgs(
+          BUSD_BORROWER,
+          addresses.vBUSD,
+          repayAmount,
+          BNB_EXPLOITER,
+          addresses.vUSDT,
+          parseUnits("30020.438638269452250292", 18),
+        );
+      await expect(tx).to.emit(busd, "Transfer").withArgs(moveDebtDelegate.address, addresses.vBUSD, repayAmount);
+    });
+  });
+});