I experienced a similar issue importing the Script object:

    import {Script} from "forge-std/Script.sol";

I didn't know that Foundry manages the path by default so I tried to find the Script.sol by following the previous shared path and couldn't find it. 

After some research, I found that the correct path was:

    import {Script} from "../lib/forge-std/src/Script.sol";

So you can either **follow the previous suggestions** which are correct **or just import it using the actual path**.

    import {Test} from "lib/forge-std/src/Test.sol"