I've got problem with mocking method call. Below is my solidity code and test. I would like to pass mock into withdraw method and check if transfer function was called. But instead I am getting error "Mock on the method is not initialized". Any clue? :)

  function withdraw(IERC20 token, uint256 amount) external onlyOwner {
        token.transfer(msg.sender, amount);

describe('LoanManager', () => {
  const [owner, notOwner] = new MockProvider().getWallets();
  let loanManager;
beforeEach(async () => {
    loanManager = await deployContract(owner, LoanManager);
it('Owner should be able to withdraw', async () => {
        let token = await deployMockContract(owner, IERC20.abi);
        const amount = 5;
        token.mock.transfer.withArgs(owner.address, amount).returns(true);
        loanManager.withdraw(token.address, amount);
        await expect('transfer').to.be.calledOnContract(token);

1 Answer 1


I think the issue is most likely because you didn't await when mocking the function.


should be

await token.mock.transfer.withArgs(...)

Hope it helps.

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