useLogin.test.tsx

describe.only("useLogin", () => {

    beforeEach(() => {
        loginUserMock.mockImplementation((username, password) => {
            return new Promise((resolve) => {
                if (username === "admin" && password === "admin") {
                    resolve({ loginSucceeded: true, username: "admin" });
                } else {
                    resolve({ loginSucceeded: false });
                }
            });
        });
    });
    ...