jest-mocker

A mocking helper for those who would like to explicitly mock modules preserving compile-time type and refactoring safety.

Usage

Inject a Mocker instance as a global (e.g. mocker) to use during your tests.

Then you can use e.g. mocker.mockAllFunctionsInObject(ClassOrObject) to replace all functions within that object with mocks.

The function returns a strongly typed object containing mocks, so you can setup and verify calls on them.

On the other hand, you can continue invoking any method as usual through ClassOrObject, and your mocks will be called instead.

API

1. mockAllFunctionsInObject - mocks all functions in an object and resets their default implementation to always returning undefined.
2. spyOnAllFunctionsInObject - mocks all functions in an object and keeps their real implementation by default.
3. mockOneFunctionInObject - mocks just one function in an object and resets its default implementation to always returning undefined. The rest of the functions are not mocked.
4. mockAllButOneFunctionInObject - mocks all functions but one in an object and resets their default implementation to always returning undefined. The remaining function is not mocked.
5. spyOnAllButOneFunctionInObject - mocks all functions except one in an object and keeps their real implementation by default. The remaining function is not mocked.

All methods return a strongly typed object with relevant functions marked as mock instances.