Issue when mocking functions that exist in the same file

Question

I'm writing tests for my TypeScript project and I'm having issues when mocking two functions in the same file.
This is my structure:

• api-helper.ts
• api-helper.test.ts

The functions sendRequest and checkAccountActivatedByEmail are inside api-helper.ts

This is my test:

describe('Test for api-helper.ts', () => {
  let context: Context;

  beforeEach(() => {
    context = {
      log: () => {},
      executionContext: {
        invocationId: '1',
      },
    } as unknown as Context;
    jest.clearAllMocks();
    jest.resetAllMocks();
  });

  test('checkAccountActivatedByEmail: valid and activated', async () => {
    // jest.mock('./api-helper', () => ({
    //   sendRequest: jest.fn().mockResolvedValue({
    //     status: 200,
    //     json: () => ({ id: 'xx', activated: true }),
    //   }),
    // }));

    jest.spyOn(utils, 'sendRequest').mockResolvedValue({
      status: 200,
      json: () => ({ id: 'xx', activated: true }),
    } as any);
    const resp = await utils.checkAccountActivatedByEmail(context, 'xx');
    expect(resp).toStrictEqual({ activatedByEmail: true, oktaId: 'xx' });
  });
});

The commented lines above are just to show you different ways I'm trying to mock it. Seeing the console I do realize checkAccountActivatedByEmail it's calling the real sendRequest function.

What am I doing wrong for the sendRequest not to be mocked?

I have already tried to mock in different ways and also mockImplementation.