Description

Test cases are picking the required subject module from the cache. Hence they don't get the mocked instances of functions/modules that have been replaced using td.replace().

Manually deleting the entry from require.cache solves it. And the next require() call correctly picks up the mocked references. Also such issues occur only when the entire test suite is run, running individual tests don't seem to cause such problems

Issue: General question

As per this section in docs, having td.replace() and require() in the beforeEach() block bypasses module cache, but for some reason this doesn't seem to work in my setup

// test.js

// other tests

describe('Testing module A', () => {
  let depModule, subject
  beforeEach(() => {
    depModule = require('path/to/depModule')
    let mockedFn = td.replace(depModule, 'depFn')
    subject = require('path/to/subjectModule') // refers to original depFn
  })
  afterEach(() => {
    td.reset()
  })
 // it blocks
)

To fix this I am currently maunally deleting references from require.cache. Like below:

beforeEach(() => {

  /** hacky workaround */
  delete require.cache[require.resolve('path/to/subjectModule')]


  depModule = require('path/to/depModule')
  let mockedFn = td.replace(depModule, 'depFn')
  subject = require('path/to/subjectModule') // refers to mocked depFn
})

I would like to understand in such cases what is the cause usually? and if any there are better ways to deal with it?

P.S.: Please correct me if this is not the correct channel for queries