jest-mock

Upstream: https://github.com/facebook/jest/tree/v27.4.7/packages/jest-mock

This package implements the various function and module mocking capabilities used by Jest. You can find its documentation in the Jest documentation.

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:pencil2: Notes

• As of right now, only a minimal set of functionality for jest-mock has been ported. The only externally facing functions that are supported are:
  • Creating an instance of the ModuleMockerClass via constructor (i.e. importing jest-mock and calling .new() on the import)
  • And then these functions are supported on an instance of the ModuleMockerClass:
    • fn() - create a function that can help in unit testing to confirm expectations on number of calls, returns, call arguments, etc. (currently this is mainly useful for the spyMatchers)
    • clearAllMocks()
    • resetAllMocks()
    • restoreAllMocks()