Mock success of calling another contract's function using .call(abi.encode(...))

[AboldUSER]

Setup:
waffle/ethers/hardhat

Issue:
I am testing a contract that has a function which calls another contract's function using abi.encodeWithSignature. Below is example code based on the contract I am testing:

(bool success, ) = address(otherContract).call(
      abi.encodeWithSignature("otherContractFunction(address,uint256)", msg.sender, amount)
    );

When testing, how can I mock otherContract to have the called function pass (i.e., return a bool success of true)? The called upon function in otherContract doesn't return anything, and I don't know how to mock a call(abi.encodeWithSignature(...)) to return true. The Waffle mock documentation doesn't really give insights into this either.

So far, if I mock the otherContract in testing with await otherContract.mock.otherContractFunction.returns(true), then I get the following error:
Error: types/values length mismatch (count={"types":0,"values":1}, value={"types":[],"values":[true]}, code=INVALID_ARGUMENT, version=abi/5.4.1)

If I mock the otherContract in testing with await otherContract.mock.otherContractFunction.returns(), then I get the following error:
Error: VM Exception while processing transaction: reverted with reason string 'Mock on the method is not initialized'

[mister36]

@AboldUSER did you ever solve this issue?

[AboldUSER]

I actually don't remember exactly which project or smart contract I was having this issue with, though I believe I ended up just using a interface to call the contract method and having the test pass :(