MockERC20.sol

Minimal ERC20 for tests.

60 lines1.9 KBSolidity

Source of test/mocks/MockERC20.sol, 60 lines of Solidity
1	// SPDX-License-Identifier: MIT
2	pragma solidity ^0.8.24;
3
4	/// @dev Minimal mintable ERC20 with configurable decimals. Stands in for USDG and for
5	/// every tokenized equity (NVDA, AAPL, TSLA, ...) in the test suite.
6	contract MockERC20 {
7	string public name;
8	string public symbol;
9	uint8 public immutable decimals;
10
11	uint256 public totalSupply;
12	mapping(address => uint256) public balanceOf;
13	mapping(address => mapping(address => uint256)) public allowance;
14
15	event Transfer(address indexed from, address indexed to, uint256 value);
16	event Approval(address indexed owner, address indexed spender, uint256 value);
17
18	constructor(string memory n, string memory s, uint8 d) {
19	name = n;
20	symbol = s;
21	decimals = d;
22	}
23
24	function mint(address to, uint256 amount) external {
25	totalSupply += amount;
26	balanceOf[to] += amount;
27	emit Transfer(address(0), to, amount);
28	}
29
30	function burn(address from, uint256 amount) external {
31	balanceOf[from] -= amount;
32	totalSupply -= amount;
33	emit Transfer(from, address(0), amount);
34	}
35
36	function approve(address spender, uint256 amount) external returns (bool) {
37	allowance[msg.sender][spender] = amount;
38	emit Approval(msg.sender, spender, amount);
39	return true;
40	}
41
42	function transfer(address to, uint256 amount) public virtual returns (bool) {
43	_transfer(msg.sender, to, amount);
44	return true;
45	}
46
47	function transferFrom(address from, address to, uint256 amount) external returns (bool) {
48	uint256 allowed = allowance[from][msg.sender];
49	if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;
50	_transfer(from, to, amount);
51	return true;
52	}
53
54	function _transfer(address from, address to, uint256 amount) internal {
55	balanceOf[from] -= amount;
56	balanceOf[to] += amount;
57	emit Transfer(from, to, amount);
58	}
59	}
60

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