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CompatibleERC20.ts
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CompatibleERC20.ts
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import BN from "bn.js";
import { CompatibleERC20TestInstance, ReturnsFalseTokenInstance } from "../types/truffle-contracts";
import "./helper/testUtils";
const CompatibleERC20Test = artifacts.require("CompatibleERC20Test");
const NormalToken = artifacts.require("NormalToken");
const ReturnsFalseToken = artifacts.require("ReturnsFalseToken");
const NonCompliantToken = artifacts.require("NonCompliantToken");
const TokenWithFees = artifacts.require("TokenWithFees");
contract("CompatibleERC20", (accounts) => {
let mock: CompatibleERC20TestInstance;
before(async () => {
mock = await CompatibleERC20Test.new();
});
const testCases = [
{ contract: NormalToken, fees: 0, desc: "standard token [true for success, throws for failure]" },
{ contract: ReturnsFalseToken, fees: 0, desc: "alternate token [true for success, false for failure]" },
{ contract: NonCompliantToken, fees: 0, desc: "non compliant token [nil for success, throws for failure]" },
{ contract: TokenWithFees, fees: 3, desc: "token with fees [true for success, throws for failure]" },
];
const VALUE = new BN(100000000000000);
for (const testCase of testCases) {
context(testCase.desc, async () => {
let token: ReturnsFalseTokenInstance;
const FEE = VALUE.mul(new BN(testCase.fees)).div(new BN(1000));
before(async () => {
token = await testCase.contract.new() as ReturnsFalseTokenInstance;
});
it("approve and transferFrom", async () => {
// Get balances before depositing
const before = new BN(await token.balanceOf(accounts[0]));
const after = new BN(await token.balanceOf(mock.address));
// Approve and deposit
await token.approve(mock.address, VALUE);
await mock.deposit(token.address, VALUE);
// Compare balances after depositing
(await token.balanceOf(accounts[0]))
.should.bignumber.equal(before.sub(new BN(VALUE)));
(await token.balanceOf(mock.address))
.should.bignumber.equal(after.add(new BN(VALUE.sub(FEE))));
});
it("transfer", async () => {
// Get balances before depositing
const before = new BN(await token.balanceOf(accounts[0]));
const after = new BN(await token.balanceOf(mock.address));
const NEW_VALUE = VALUE.sub(FEE);
const NEW_FEE = NEW_VALUE.mul(new BN(testCase.fees)).div(new BN(1000));
// Withdraw
await mock.withdraw(token.address, NEW_VALUE);
// Compare balances after depositing
(await token.balanceOf(accounts[0]))
.should.bignumber.equal(before.add(new BN(NEW_VALUE.sub(NEW_FEE))));
(await token.balanceOf(mock.address))
.should.bignumber.equal(after.sub(new BN(NEW_VALUE)));
});
it("throws for invalid transferFrom", async () => {
// Get balances before depositing
const before = new BN(await token.balanceOf(accounts[0]));
const after = new BN(await token.balanceOf(mock.address));
// Approve and deposit
await token.approve(mock.address, 0);
await mock.naiveDeposit(token.address, VALUE)
.should.be.rejectedWith(/revert/);
// Compare balances after depositing
(await token.balanceOf(accounts[0])).should.bignumber.equal(before);
(await token.balanceOf(mock.address)).should.bignumber.equal(after);
});
it("throws for invalid transferFrom (with fee)", async () => {
// Get balances before depositing
const before = new BN(await token.balanceOf(accounts[0]));
const after = new BN(await token.balanceOf(mock.address));
// Approve and deposit
await token.approve(mock.address, 0);
await mock.deposit(token.address, VALUE)
.should.be.rejectedWith(/revert/);
// Compare balances after depositing
(await token.balanceOf(accounts[0])).should.bignumber.equal(before);
(await token.balanceOf(mock.address)).should.bignumber.equal(after);
});
it("throws for invalid transfer", async () => {
// Get balances before depositing
const before = new BN(await token.balanceOf(accounts[0]));
const after = new BN(await token.balanceOf(mock.address));
// Withdraw
await mock.withdraw(token.address, VALUE.mul(new BN(2)))
.should.be.rejectedWith(/revert/);
// Compare balances after depositing
(await token.balanceOf(accounts[0])).should.bignumber.equal(before);
(await token.balanceOf(mock.address)).should.bignumber.equal(after);
});
it("throws for invalid approve", async () => {
// Transfer to the contract
await token.transfer(mock.address, VALUE);
// Subtract fees
const NEW_VALUE = VALUE.sub(FEE);
const NEW_FEE = NEW_VALUE.mul(new BN(testCase.fees)).div(new BN(1000));
// Get balances before transferring back
const before = new BN(await token.balanceOf(accounts[0]));
const after = new BN(await token.balanceOf(mock.address));
// Approve twice without resetting allowance
await mock.approve(token.address, NEW_VALUE);
await mock.approve(token.address, NEW_VALUE)
.should.be.rejectedWith(/revert/);
// Can transfer from the contract
await token.transferFrom(mock.address, accounts[0], NEW_VALUE.sub(NEW_FEE));
// Subtract fees second time
const NEW_NEW_VALUE = NEW_VALUE.sub(NEW_FEE);
const NEW_NEW_FEE = NEW_NEW_VALUE.mul(new BN(testCase.fees)).div(new BN(1000));
// Compare balances after depositing
(await token.balanceOf(accounts[0]))
.should.bignumber.equal(before.add(new BN(NEW_NEW_VALUE.sub(NEW_NEW_FEE))));
(await token.balanceOf(mock.address))
.should.bignumber.equal(after.sub(new BN(NEW_NEW_VALUE)));
});
it("throws for naive deposit if it has fees", async () => {
// Get balances before depositing
const before = new BN(await token.balanceOf(accounts[0]));
const after = new BN(await token.balanceOf(mock.address));
// Approve and deposit
await token.approve(mock.address, VALUE);
if (testCase.fees) {
await mock.naiveDeposit(token.address, VALUE)
.should.be.rejectedWith("incorrect balance in deposit");
await token.approve(mock.address, 0);
} else {
await mock.naiveDeposit(token.address, VALUE);
// Compare balances after depositing
(await token.balanceOf(accounts[0]))
.should.bignumber.equal(before.sub(new BN(VALUE.sub(FEE))));
(await token.balanceOf(mock.address))
.should.bignumber.equal(after.add(new BN(VALUE)));
}
});
});
}
});