const { expect } = require("chai") const { exampleLock } = require("./examples") describe("Collateral", function () { let collateral, token let account0, account1 beforeEach(async function () { let Collateral = await ethers.getContractFactory("TestCollateral") let TestToken = await ethers.getContractFactory("TestToken") token = await TestToken.deploy() collateral = await Collateral.deploy(token.address) ;[account0, account1] = await ethers.getSigners() await token.mint(account0.address, 1000) await token.mint(account1.address, 1000) }) it("assigns zero collateral by default", async function () { expect(await collateral.balanceOf(account0.address)).to.equal(0) expect(await collateral.balanceOf(account1.address)).to.equal(0) }) describe("depositing", function () { beforeEach(async function () { await token.connect(account0).approve(collateral.address, 100) await token.connect(account1).approve(collateral.address, 100) }) it("updates the amount of collateral", async function () { await collateral.connect(account0).deposit(40) await collateral.connect(account1).deposit(2) expect(await collateral.balanceOf(account0.address)).to.equal(40) expect(await collateral.balanceOf(account1.address)).to.equal(2) }) it("transfers tokens to the contract", async function () { let before = await token.balanceOf(collateral.address) await collateral.deposit(42) let after = await token.balanceOf(collateral.address) expect(after - before).to.equal(42) }) it("fails when token transfer fails", async function () { let allowed = await token.allowance(account0.address, collateral.address) let invalidAmount = allowed.toNumber() + 1 await expect(collateral.deposit(invalidAmount)).to.be.revertedWith( "ERC20: insufficient allowance" ) }) }) describe("withdrawing", function () { beforeEach(async function () { await token.connect(account0).approve(collateral.address, 100) await token.connect(account1).approve(collateral.address, 100) await collateral.connect(account0).deposit(40) await collateral.connect(account1).deposit(2) }) it("updates the amount of collateral", async function () { await collateral.connect(account0).withdraw() expect(await collateral.balanceOf(account0.address)).to.equal(0) expect(await collateral.balanceOf(account1.address)).to.equal(2) await collateral.connect(account1).withdraw() expect(await collateral.balanceOf(account0.address)).to.equal(0) expect(await collateral.balanceOf(account1.address)).to.equal(0) }) it("transfers balance to owner", async function () { let balance = await collateral.balanceOf(account0.address) let before = await token.balanceOf(account0.address) await collateral.withdraw() let after = await token.balanceOf(account0.address) expect(after - before).to.equal(balance) }) }) describe("slashing", function () { beforeEach(async function () { await token.connect(account0).approve(collateral.address, 1000) await token.connect(account1).approve(collateral.address, 1000) await collateral.connect(account0).deposit(1000) await collateral.connect(account1).deposit(1000) }) it("reduces the amount of collateral by a percentage", async function () { await collateral.slash(account0.address, 10) await collateral.slash(account1.address, 5) expect(await collateral.balanceOf(account0.address)).to.equal(900) expect(await collateral.balanceOf(account1.address)).to.equal(950) }) }) describe("locking", function () { let lock beforeEach(async function () { await token.approve(collateral.address, 42) await collateral.deposit(42) lock = exampleLock() await collateral.createLock(lock.id, lock.expiry) await collateral.lock(account0.address, lock.id) }) it("withdrawal fails when account is locked", async function () { await expect(collateral.withdraw()).to.be.revertedWith("Account locked") }) it("withdrawal succeeds when account is unlocked", async function () { await collateral.unlock(lock.id) await expect(collateral.withdraw()).not.to.be.reverted }) }) })