    const accountOne = accounts[0];
    const accountTwo = accounts[1];

    // Get initial balances of first and second account.
    const accountOneStartingBalance = (await instance.balanceOf(accountOne));
    const accountTwoStartingBalance = (await instance.balanceOf(accountTwo));

    // Make transaction from first account to second.
    const amount = web3.utils.toBN(10);
    await instance.transfer(accountTwo, amount);