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dex.js
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const { expectRevert } = require("@openzeppelin/test-helpers");
const Dai = artifacts.require("mocks/Dai.sol");
const Bat = artifacts.require("mocks/Bat.sol");
const Rep = artifacts.require("mocks/Rep.sol");
const Zrx = artifacts.require("mocks/Zrx.sol");
const Dex = artifacts.require("Dex.sol");
const SIDE = {
BUY: 0,
SELL: 1,
};
contract("Dex", (accounts) => {
let dai, bat, rep, zrx, dex;
const [trader1, trader2] = [accounts[1], accounts[2]];
const [DAI, BAT, REP, ZRX] = ["DAI", "BAT", "REP", "ZRX"].map((ticker) =>
web3.utils.fromAscii(ticker)
);
beforeEach(async () => {
[dai, bat, rep, zrx] = await Promise.all([
Dai.new(),
Bat.new(),
Rep.new(),
Zrx.new(),
]);
dex = await Dex.new();
await Promise.all([
dex.addToken(DAI, dai.address),
dex.addToken(BAT, bat.address),
dex.addToken(REP, rep.address),
dex.addToken(ZRX, zrx.address),
]);
const amount = web3.utils.toWei("1000");
const seedTokenBalance = async (token, trader) => {
await token.faucet(trader, amount);
await token.approve(dex.address, amount, { from: trader });
};
await Promise.all(
[dai, bat, rep, zrx].map((token) => seedTokenBalance(token, trader1))
);
await Promise.all(
[dai, bat, rep, zrx].map((token) => seedTokenBalance(token, trader2))
);
});
it("should deposit tokens", async () => {
const amount = web3.utils.toWei("100");
await dex.deposit(amount, DAI, { from: trader1 });
const balance = await dex.traderBalances(trader1, DAI);
assert(balance.toString() === amount);
});
it("should NOT deposit token if token does not exist", async () => {
const amount = web3.utils.toWei("100");
await expectRevert(
dex.deposit(amount, web3.utils.fromAscii("SOMETOKEN"), { from: trader1 }),
"this token does not exist"
);
});
it("should withdraw tokens", async () => {
const amount = web3.utils.toWei("100");
await dex.deposit(amount, DAI, { from: trader1 });
await dex.withdraw(amount, DAI, { from: trader1 });
const [balanceDex, balanceDai] = await Promise.all([
dex.traderBalances(trader1, DAI),
dai.balanceOf(trader1),
]);
assert(balanceDex.isZero());
assert(balanceDai.toString() === web3.utils.toWei("1000"));
});
it("should NOT withdraw tokens if token does not exist", async () => {
const amount = web3.utils.toWei("100");
await expectRevert(
dex.withdraw(amount, web3.utils.fromAscii("SOMETOKEN"), {
from: trader1,
}),
"this token does not exist"
);
});
it("should NOT withdraw tokens if balance is too low", async () => {
const amount = web3.utils.toWei("100");
await dex.deposit(amount, DAI, { from: trader1 });
await expectRevert(
dex.withdraw(web3.utils.toWei("1000"), DAI, { from: trader1 }),
"balance too low"
);
});
it("should create limit order", async () => {
const amount = web3.utils.toWei("100");
await dex.deposit(amount, DAI, { from: trader1 });
await dex.createLimitOrder(REP, web3.utils.toWei("10"), 10, SIDE.BUY, {
from: trader1,
});
const buyOrders = await dex.getOrders(REP, SIDE.BUY);
const sellOrders = await dex.getOrders(REP, SIDE.SELL);
assert(buyOrders.length === 1);
assert(buyOrders[0].trader === trader1);
assert(buyOrders[0].ticker === web3.utils.padRight(REP, 64));
assert(buyOrders[0].price === "10");
assert(buyOrders[0].amount === web3.utils.toWei("10"));
assert(sellOrders.length === 0);
await dex.deposit(web3.utils.toWei("200"), DAI, { from: trader2 });
await dex.createLimitOrder(REP, web3.utils.toWei("10"), 11, SIDE.BUY, {
from: trader2,
});
const buyOrders1 = await dex.getOrders(REP, SIDE.BUY);
const sellOrders1 = await dex.getOrders(REP, SIDE.SELL);
assert(buyOrders1.length === 2);
assert(buyOrders1[0].trader === trader2);
assert(buyOrders1[1].trader === trader1);
assert(sellOrders1.length === 0);
await dex.createLimitOrder(REP, web3.utils.toWei("10"), 9, SIDE.BUY, {
from: trader2,
});
const buyOrders2 = await dex.getOrders(REP, SIDE.BUY);
const sellOrders2 = await dex.getOrders(REP, SIDE.SELL);
assert(buyOrders2.length === 3);
assert(buyOrders2[0].trader === trader2);
assert(buyOrders2[1].trader === trader1);
assert(buyOrders2[2].trader === trader2);
assert(buyOrders2[2].price === "9");
assert(sellOrders2.length === 0);
});
it("should NOT create limit order if token doesnt exist", async () => {
await expectRevert(
dex.createLimitOrder(
web3.utils.fromAscii("SOMETOKEN"),
web3.utils.toWei("1000"),
10,
SIDE.BUY,
{ from: trader1 }
),
"this token does not exist"
);
});
it("should NOT create limit order if token is DAI", async () => {
await expectRevert(
dex.createLimitOrder(DAI, web3.utils.toWei("1000"), 10, SIDE.BUY, {
from: trader1,
}),
"cannot trade DAI"
);
});
it("should NOT create limit order if token balance is too low", async () => {
await dex.deposit(web3.utils.toWei("99"), REP, { from: trader1 });
await expectRevert(
dex.createLimitOrder(REP, web3.utils.toWei("100"), 10, SIDE.SELL, {
from: trader1,
}),
"token balance too low"
);
});
it("should NOT create limit order if DAI balance is too low", async () => {
await dex.deposit(web3.utils.toWei("99"), DAI, { from: trader1 });
await expectRevert(
dex.createLimitOrder(REP, web3.utils.toWei("10"), 10, SIDE.BUY, {
from: trader1,
}),
"dai balance too low"
);
});
it("should create market order & match against existing limit order", async () => {
await dex.deposit(web3.utils.toWei("100"), DAI, { from: trader1 });
await dex.createLimitOrder(REP, web3.utils.toWei("10"), 10, SIDE.BUY, {
from: trader1,
});
await dex.deposit(web3.utils.toWei("100"), REP, { from: trader2 });
await dex.createMarketOrder(REP, web3.utils.toWei("5"), SIDE.SELL, {
from: trader2,
});
const balances = await Promise.all([
dex.traderBalances(trader1,DAI),
dex.traderBalances(trader1,REP),
dex.traderBalances(trader2,DAI),
dex.traderBalances(trader2,REP),
]);
const orders = await dex.getOrders(REP,SIDE.BUY);
assert(orders[0].filled === web3.utils.toWei('5'));
assert(balances[0].toString() === web3.utils.toWei('50'))
assert(balances[1].toString() === web3.utils.toWei('5'))
assert(balances[2].toString() === web3.utils.toWei('50'))
assert(balances[3].toString() === web3.utils.toWei('95'))
});
it("should NOT create market order if token doesnt exist", async () => {
await expectRevert(
dex.createMarketOrder(
web3.utils.fromAscii("SOMETOKEN"),
web3.utils.toWei("1000"),
SIDE.BUY,
{ from: trader1 }
),
"this token does not exist"
);
});
it("should NOT create market order if token is DAI", async () => {
await expectRevert(
dex.createMarketOrder(DAI, web3.utils.toWei("1000"), SIDE.BUY, {
from: trader1,
}),
"cannot trade DAI"
);
});
it("should NOT create market order if token balance is too low", async () => {
await dex.deposit(web3.utils.toWei("99"), REP, { from: trader1 });
await expectRevert(
dex.createMarketOrder(REP, web3.utils.toWei("100"), SIDE.SELL, {
from: trader1,
}),
"token balance too low"
);
});
it("should NOT create market order if DAI balance is too low", async () => {
await dex.deposit(web3.utils.toWei("100"), REP, { from: trader1 });
await dex.createLimitOrder(REP, web3.utils.toWei("100"), 10, SIDE.SELL, {
from: trader1,
});
await expectRevert(
dex.createMarketOrder(REP, web3.utils.toWei("100"), SIDE.BUY, {
from: trader2,
}),
"dai balance too low"
);
});
});