Testing calling another contract with Foundry / Solidity

Call.t.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import "forge-std/Test.sol";
import 'src/Call.sol';

contract AuctionTest is Test {
    Call callContract;
    TestCall tCallContract;

    function setUp() public {
        tCallContract = new TestCall();
        callContract = new Call();
    }

    function testCall() public {
        vm.expectCall(
            address(tCallContract),
            abi.encodeWithSignature("foo(string, uint256)", "call foo", 123)
        );
        callContract.callFoo(address(tCallContract));
    }
}