assertEq returns "invalid data" when left and right values are the same

[MGM103]

Hi Everyone,

I am currently completing the testing in the upgradeable smart contract portion of the Advanced foundry course. I am unsure why but when I used assertEq(left, right) I kept getting an error: "invalid data". However, when I used: assert(left == right) the tests passed. Here is the code I was using:

function testUpgrade() public {
        uint8 expectedVersion = 2;
        uint256 expectedNumber = 3;

        BoxV2 boxV2 = new BoxV2();

        upgrader.upgradeBox(proxy, address(boxV2));
        uint8 currentVersion = BoxV2(proxy).getVersion();
        assertEq(currentVersion, expectedVersion);

        BoxV2(proxy).setNumber(3);
        assertEq(BoxV2(proxy).getNumber(), expectedNumber);
    }

Link to my repo: https://github.com/MGM103/upgradeability-solidity

Appreciate the explanation in advance!

[EngrPips]

Hello, @MGM103. That seems weird, but I suggest you run foundry and retry. Let us know if it works after running foundryUp

[MGM103]

It was a weird one, but running foundryup did the trick and my assertEq's are working again!

[EngrPips]

I am glad that worked; Foundry sometimes misbehaves when you need to install the latest version.

[PhasedNorth]

Hey! Thank you this solved the problem I was having too

[EngrPips]

Awesome, I am glad it helped you. Keep crushing it!