I am writing a test to check that one method is called when the callback is executed. However, it is getting me this error.

expect(received).toHaveBeenCalled()

Matcher error: received value must be a mock or spy function

Received has value: undefined

According to Jest automatic class mocks adding the line jest.mock(...) should be enough to get a mocked class, but it seems that I am missing something here.

This is my test file:

import { render, fireEvent } from "@testing-library/react";
import Grid from "../../components/Grid";
import DetectFibonacciUseCase from "../../useCases/DetectFibonacciUseCase";

jest.mock("../../useCases/DetectFibonacciUseCase");

describe("GridComponent", () => {
    test("Should've called the run method when the callback is executed", () => {
       const { getByTestId } = render(<Grid />);
       const firstCellButton = getByTestId("cell-testid-0-0");

       fireEvent.click(firstCellButton);

       expect(DetectFibonacciUseCase.run).toHaveBeenCalled();
    });
});

The callback function looks like this, and it is actually being executed:

const calculateNewValues = (row, column) => {
    const updatedCells = cells.map((cell) => {
        cell.value = cell.row === row || cell.column === column
          ? cell.value + 1
          : cell.value;
        cell.color = cell.row === row || cell.column === column ? ColorConstants.yellow : cell.color;
        return cell;
    });

    const detectFibonacciUseCase = new DetectFibonacciUseCase(
        MINIMUM_CONSECUTIVE_APPAREANCES
    );
    const cellsWithFibonacci = detectFibonacciUseCase.run(updatedCells);
    cellsWithFibonacci.forEach((cellWithFibonacci) => {
      const cellToUpdateIndex = updatedCells.findIndex(
        (cell) =>
          cell.row === cellWithFibonacci.row &&
          cell.column === cellWithFibonacci.column
      );
      updatedCells[cellToUpdateIndex].color = ColorConstants.green;
      updatedCells[cellToUpdateIndex].value = 1;
    });

    setCells(updatedCells);
    removeColorsAfterTimeout(updatedCells);
};

I've also tried to use the mockImplementation method, but with no luck at all. Any suggestion is well-received.

Jest version: 26.6.0 React version: 17.0.2 React-testing-library version: ^12.1.2