Testing · Senior · Question 60 of 75

Why is dependency injection helpful for testability?

✓Correct answer: Dependencies (clock, HTTP client, storage) can be replaced with doubles without module-mocking tricks
2It makes code run faster
3It removes the need for tests

Explanation

Passing a now() function or an API client as a parameter is the simplest form of DI.

Further reading

Test yourself

Take the Testing · Senior quiz: questions and options are shuffled, and you get a review of your mistakes at the end.