I have a function that takes in an object, manipulates it, checks that the manipulated object still contains data, then iterates through the object’s keys using Object.keys / forEach and passes the data to another function. This all works, but Jest is saying I don’t have coverage for the Object.keys lines, despite several tests that test this function successfully:

My main file:

  export const assignAndTrigger = (tags) => {
  const tagObject = assignTagObject(tags);

  if (tagObject) {
    Object.keys(tagObject).forEach((tagArrays) => {
      triggerTags(tagObject[tagArrays]);
    });
  }
};

export const triggerTags = (tags) => {
//do some stuff with the tags
});

My test file is saying I do not have coverage for lines 5 and 6 in the above.
I’ve tried setting up specific tests to confirm that the triggerTags object is firing successfully, but it doesn’t seem to be working as I intend. Here I’m mocking the functions and expecting triggerTags to be called:

 import { assignAndTrigger } from '../../src/mainFile';
import * as mainFile from '../../src/mainFile';

jest.mock('../../src/mainFile', () => ({
    triggerTags: jest.fn(),
    assignAndTrigger: jest.fn()
  }));
describe('assignAndTrigger()', () => {
  beforeEach(() => {
    // mock triggerTags function
    jest.spyOn(mainFile, 'triggerTags');
  });

  afterEach(() => {
    jest.restoreAllMocks();
    jest.clearAllMocks();
    delete window.digitalData;
  });

  it('should call triggerTags function', () => {
    const tags = {
        Tags: {
        Item1: [{ tag_name: 'AB-0001', custom_parameters: {} }],
        Item2: [{ tag_name: 'CD-0001', custom_parameters: {} }],
        },
    };

    
    assignAndTrigger(tags);
    expect(triggerTags).toHaveBeenCalled();
  });
});

In another test I tried spyOn, but that seems to not work either, as. I get the error: Property triggerTags does not exist in the provided objec:

 it('should run assignTagObject and trigger tags', () => {
    const spy = jest.spyOn(assignAndTrigger, 'triggerTags');
    assignAndTrigger(tags);
    expect(spy).toHaveBeenCalled();
  });