Testing composite sagas with no direct action triggers

[vishnusankaran-plivo]

For composite sagas with no direct action triggers, but only generator yield calls, how do we mock those yield calls with redux-saga-tester?

function* onFetchBooks(action) {
  const { genre = '', page = 1 } = action.payload
  const updatedAction = { ...action, payload: { name: searchText, page, page_size: 20 } }

  if (genre === 'Fiction') {
    yield fetchFiction(action.payload)
  } else if (genre === 'NonFiction') {
    yield fetchNonFiction(action.payload)
  } else {
    yield fetchAll(action.payload)
  }
}

*Note: onFetchBooks, fetchFiction, fetchNonFiction and fetchAll are in the same file

Mocking with jest also doesn't seems to work.

jest.fn(fetchFiction)
jest.fn(fetchNonFiction)
jest.fn(fetchAll)

Also, there isn't a way to mock in the SagaTester constructor or the .start() method as well.

Can someone help with this query?