dagger-contracts/test/Collateral.test.js

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const { expect } = require("chai")
describe("Collateral", function () {
let collateral, token
let account0, account1
beforeEach(async function () {
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let Collateral = await ethers.getContractFactory("TestCollateral")
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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(
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"ERC20: insufficient allowance"
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)
})
})
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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)
})
})
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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)
})
})
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})