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docs: Add additional reason why mocking is useful.

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Robert Hönig 2017-09-11 10:53:07 +02:00 committed by Tim Abbott
parent c953759486
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docs/testing-with-django.md
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@ -119,12 +119,19 @@ Additionally, you can observe any calls made to your mocked object.
#### Why is mocking useful? #### Why is mocking useful?
When writing tests, it often occurs that you make calls to functions taking complex arguments. Creating a real When writing tests, it often occurs that you make calls to functions
instance of such an argument would require the use of various different libraries, a lot of boilerplate code, etc. taking complex arguments. Creating a real instance of such an argument
Another scenario is that the tested code accesses files or objects that don't exist at testing time. would require the use of various different libraries, a lot of
boilerplate code, etc. Another scenario is that the tested code
accesses files or objects that don't exist at testing time. Finally,
it is good practice to keep tests independent from others. Mocks help
you to isolate test cases by simulating objects and methods irrelevant
to a test's goal.
In such cases, you can "mock out" the function calls / objects and replace them with fake instances that only implement a In all of these cases, you can "mock out" the function calls / objects
limited interface. On top of that, these fake instances can be easily analyzed. and replace them with fake instances that only implement a limited
interface. On top of that, these fake instances can be easily
analyzed.
Say you have a method `foo(input_str)`: Say you have a method `foo(input_str)`: