start

src/IERC20Metadata.sol

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+// SPDX-License-Identifier: UNLICENSED
+pragma solidity =0.7.6;
+
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+
+// the version of OpenZeppelin required by Uniswap v3 doesn't have IERC20Metadata yet, so we copy it here.
+interface IERC20Metadata is IERC20 {
+    /**
+     * @dev Returns the name of the token.
+     */
+    function name() external view returns (string memory);
+
+    /**
+     * @dev Returns the symbol of the token.
+     */
+    function symbol() external view returns (string memory);
+
+    /**
+     * @dev Returns the decimals places of the token.
+     */
+    function decimals() external view returns (uint8);
+}

src/MockERC20.sol

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+import "openzeppelin/contracts/token/ERC20/ERC20.sol";
+import "./IERC20Metadata.sol";
+
+
+contract MockERC20 is ERC20, IERC20Metadata {
+
+    constructor(string name, string symbol, uint8 decimals)
+    ERC20(name, symbol)
+    {
+        _setupDecimals(decimals);
+    }
+
+
+    function mint(address account, uint256 amount) external {
+        _mint(account, amount);
+    }
+}