Mocked imported function is not called by jest unit test

I just want to mock a function which is imported in the function, which I want to test:

content.ts

import { getFileContent } from './files' // Mock this one

export const example = async (argv) => { // This function should be tested
    let result = {}

    const { nodes } = await getFileContent(argv) // Mock this one
    console.log(nodes)

    result = nodes.type
    return result
}

file.ts

export const getFileContent = async (argv) => {
    try {
      return reader(argv.path) // reader is a function inside this file which reads files using `fs`
    } catch (error) {
      console.error(error)
    }
}

content.spec.ts

import { example } from './content'

const mockGetContent = jest.fn(() =>
    Promise.resolve({ nodes: { type: 'app' } })
)
jest.mock('./files', () => ({
    getFileContent: () => mockGetContent
}))

test('should call mock function', async () => {
    const argv = { path: './file.json'}
    await example(argv)
    expect(mockGetContent).toHaveBeenCalled()
})

But the expect fails, as mockGetContent has not been called. Also the console.log prints undefined.

What am I missing?