mockFn

mockFn is a JavaScript library that provides a simple and effective way to create mock functions for testing purposes. Mock functions, also known as spies or stubs, are essential tools in unit testing as they allow developers to isolate the code under test and verify its interactions with other components. mockFn enables the creation of functions that can track calls, arguments, and return values, as well as control their behavior during test execution.

The primary purpose of mockFn is to facilitate the process of writing comprehensive and reliable unit tests. By using mockFn, developers can easily replace actual dependencies with mock implementations. This allows them to test individual units of code in isolation without needing to set up complex environments or rely on external services. The library's API is designed to be intuitive, making it straightforward to define mock functions, assert their usage, and configure their behavior.

Key features of mockFn include the ability to record how many times a mock function was called, what arguments it was called with, and what it returned. This information is crucial for validating that the code under test is interacting with its dependencies as expected. Furthermore, mockFn allows developers to specify custom return values or implement specific logic for mock functions, enabling them to simulate various scenarios and edge cases. This flexibility is invaluable for ensuring the robustness of software.