Mock with Waffle return undefined - solidity

Question

I have two contracts, one returns a static value (10)
I'd like to mock this value and return 2 (for instance), I'm trying with "mock" according to the documentation, but I still get 10
my test is:
describe('test', () => {
async function setup() {
const [sender, receiver] = new MockProvider().getWallets();
const mockGetEtherPrice = await deployMockContract(sender, GetEtherPrice.abi);
const contractFactory = new ContractFactory(NumbersMarketContract.abi, NumbersMarketContract.bytecode, sender);
console.log(mockGetEtherPrice);
const contract = await contractFactory.deploy();
return {sender, receiver, contract, mockGetEtherPrice};
}
it('returns false if the wallet has less then 1000000 coins', async () => {
const {contract, mockGetEtherPrice} = await setup();
await mockGetEtherPrice.mock.getPriceMocked.returns(2);
console.log(await contract.check())
expect(await contract.check()).to.be.equal(10);
});
});
My GetEtherPrice contract is:
contract GetEtherPrice {
function getPrice() public pure returns(uint256){
return getPriceMocked();
}
function getPriceMocked() public pure returns(uint256){
return 10;
}
}
In the main contract, I use 'is' to import my contract like:
contract NumbersMarketContract is GetEtherPrice
....
function check() public pure returns (uint256){
return getPrice();
}