BasicTokenTest1.sol

pragma solidity ^0.5.0;

import "./SafeMath.sol";

contract BasicToken {
    using SafeMath for uint256;
    
    string private _name;
    string private _symbol;
    
    // Standard
    uint256 private _totalSupply; // 1010
    
    mapping (address => uint256) private _balances;
    
    constructor() public {
        _name = "MyEdsonToken";
        _symbol = "EDS";
        _totalSupply = 1000;
        _balances[msg.sender] = _totalSupply;
    }
    
    function totalSupply() external view returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view returns (uint256){
        uint256 balanceOfAccount = _balances[account];
        return balanceOfAccount;
    }

    function transfer(address recipient, uint256 amount) external returns (bool) {
        _balances[msg.sender] = _balances[msg.sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
    }

}

BasicTokenTest2.sol

pragma solidity ^0.5.0;

import "./SafeMath.sol";

contract BasicToken {
    using SafeMath for uint256;
    
    string private _name;
    string private _symbol;
    
    // Standard
    uint256 private _totalSupply; // 1010
    
    mapping (address => uint256) private _balances;
    
    constructor() public {
        _name = "MyEdsonToken";
        _symbol = "EDS";
        _totalSupply = 1000;
        _balances[msg.sender] = _totalSupply;
    }
    
    function totalSupply() external view returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view returns (uint256){
        uint256 balanceOfAccount = _balances[account];
        return balanceOfAccount;
    }

    function transfer(address recipient, uint256 amount) external returns (bool) {
        _balances[msg.sender] = _balances[msg.sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
    }

}