Error: unknown account #0 (operation="getAddress", code=UNSUPPORTED_OPERATION, version=providers/5.7.1) - testing

Question

I want to test my function withdraw of my Vuejs app.
If my wallet Metamask is connected, then I can click on a button withdraw to get the money of my contract. The function works. Now I want to test it with Jest.
withdraw: async function(){
if(typeof window.ethereum !== 'undefined') {
const provider = new ethers.providers.Web3Provider(window.ethereum);
const signer = provider.getSigner();
const contract = new ethers.Contract(this.contractAddress, NftContract.abi, signer);
try {
const transaction = await contract.withdraw();
await transaction.wait();
this.setSuccess('The withdrawal is successful');
}
catch(err) {
console.log(err);
this.setError('An error occured to withdraw');
}
}
}
I'm using eth-testing (https://www.npmjs.com/package/eth-testing?activeTab=readme) to mock the interaction with my smart contract. My test with Jest:
let wrapper;
const testingUtils = generateTestingUtils({ providerType: "MetaMask" });
beforeAll(() => {
// use this to check the state of anything in the view
wrapper = shallowMount(NFTMintComponent);
// Manually inject the mocked provider in the window as MetaMask does
global.window.ethereum = testingUtils.getProvider();
})
afterEach(() => {
// Clear all mocks between tests
testingUtils.clearAllMocks();
//jest.restoreAllMocks();
})
it('when the owner withdraw the amount of the contract, the balance of the contract should be 0 and a successful message should appear (withdraw function)', async () => {
// Start with not connected wallet
testingUtils.mockNotConnectedWallet();
// Mock the connection request of MetaMask
const account = testingUtils.mockRequestAccounts(["0xe14d2f7105f759a100eab6559282083e0d5760ff"]);
//allows to mock the chain ID / network to which the provider is connected --> 0x3 Ropsten network
testingUtils.mockChainId("0x3");
// Mock the network to Ethereum main net
testingUtils.mockBlockNumber("0x3");
const abi = NftContract.abi;
// An address may be optionally given as second argument, advised in case of multiple similar contracts
const contractTestingUtils = testingUtils.generateContractUtils(abi);
const transaction = await contractTestingUtils.mockTransaction("withdraw", '0x10Bc587867D87d1Ea1Cd62eac01b6DD027c182E9');
await wrapper.vm.withdraw();
});
I got the error: Error: unknown account #0 (operation="getAddress", code=UNSUPPORTED_OPERATION, version=providers/5.7.1) for my transaction contract.withdraw();
It's like the contract doesn't recognize my account even if I mocked my account at the beginning of the test with const account = testingUtils.mockRequestAccounts(["0xe14d2f7105f759a100eab6559282083e0d5760ff"]);
How can I fix that problem ?