UniSwapTest.js

var LeaderToken = artifacts.require("LeaderToken");
var UniSwapFactory = artifacts.require("uniswap_factory");
var UniSwapExchange = artifacts.require("uniswap_exchange");

contract("UniSwapFactory", accounts => {

  it("Add Liquidity.", async () => {
    var UniSwapFactoryInstance = await UniSwapFactory.deployed();
    var LeaderTokenInstance = await LeaderToken.deployed();
    var ExchangeInstance = await UniSwapExchange.deployed();

    var balance = await LeaderTokenInstance.balanceOf(accounts[0]);
    console.log('Balance: ' + balance);

    var templateAddress = await UniSwapFactoryInstance.exchangeTemplate();
    assert.equal(templateAddress, '0x0000000000000000000000000000000000000000', "Factory should not be initialised.");

    await UniSwapFactoryInstance.initializeFactory(ExchangeInstance.address)

    var templateAddress = await UniSwapFactoryInstance.exchangeTemplate();
    assert.notEqual(templateAddress, '0x0000000000000000000000000000000000000000', "Factory should be initialised.");

    var exchangeAddress = await UniSwapFactoryInstance.getExchange(LeaderTokenInstance.address)
    assert.equal(exchangeAddress, '0x0000000000000000000000000000000000000000', "Exchange should not be deployed.");

    var txHash = await UniSwapFactoryInstance.createExchange(LeaderTokenInstance.address, { from: accounts[0] })
    exchangeAddress = await UniSwapFactoryInstance.getExchange(LeaderTokenInstance.address)
    assert.notEqual(exchangeAddress, '0x0000000000000000000000000000000000000000', "Exchange should be deployed.");

    var approveQtyWei = web3.utils.toWei('100', 'ether');
    var txHash = await LeaderTokenInstance.approve(exchangeAddress, approveQtyWei, { from: accounts[0] });

    var allowance = await LeaderTokenInstance.allowance(accounts[0], exchangeAddress);
    assert.equal(allowance.toString(), approveQtyWei, "Token Should Be Approved.");

    var tokenBalance = await LeaderTokenInstance.balanceOf(accounts[0]);
    assert.isTrue(tokenBalance > 0);

    const MIN_LIQUIDITY = 0;
    const ETH_ADDED = web3.utils.toWei('10', 'ether');
    const TOKEN_ADDED = web3.utils.toWei('10', 'ether');

    let contract = await UniSwapExchange.at(exchangeAddress);
    //var name = await contract.tokenAddress();
    //console.log(LeaderTokenInstance.address)
    //console.log(name)
    let block = await web3.eth.getBlock("latest");

    const DEADLINE = block.timestamp + 300; // deadline = w3.eth.getBlock(w3.eth.blockNumber).timestamp

    txHash = await contract.addLiquidity(MIN_LIQUIDITY, TOKEN_ADDED, DEADLINE,
      {
        from: accounts[0],
        value: ETH_ADDED
      }
    )

  });

});