jest-when is a lightweight JavaScript library that complements Jest by matching mock function call arguments. Jest is a great tool for testing the stack; jest-when allows you to expect specific arguments for mock functions which enables you to write more robust unit tests of modules with many dependencies. It's easy to use and provides great support for multiple matchers, which is why our teams have made jest-when their default choice for mocking in this space.
jest-when is a lightweight JavaScript library that complements Jest by matching mock function call arguments. Jest is a great tool for testing the stack; jest-when allows you to expect specific arguments for mock functions and thus lets you write more robust unit tests of modules with many dependencies.
