Bug: mock single_service

[gmeister2]

Describe the bug
Cannot mock single_service()

CodeIgniter 4 version
CI 4.1.1

Affected module(s)
system/Common.php -> single_service()
system/Config/BaseService.php -> serviceExists()

Expected behavior, and steps to reproduce if appropriate
When getting a service like this (shared instance):
$example = service('example');
Afterwards you can a mock this when testing with:
Services::injectMock('example', $example);

When getting a service like this (new instance):
$example = single_service('example');
Creating a mock when testing is not possible with:
Services::injectMock('example', $example);

[MGatner]

Mocked services only apply to shared instances, whereas single_service() is explicitly for acquiring non-shared instances:

Always returns a new instance of the class.

I'm not saying this is the most desirable behavior but whoever created Services built it this way, it is not a bug.

[gmeister2]

Ok, thanks for your answer. I was unsure whether to label this as a bug or a feature request. My confusion stems from the documentation under Testing / Getting Started / Mocking Services, my understanding was that mocking would apply to all Services.

[MGatner]

I agree that mocking being for "shared only" is unintuitive and I would support such a feature request. If you wish to pursue this please post it on the forums (you can link it here) to gather feedback. I am curious whether the team would consider this a breaking change given that some developers may be using mocking with the understanding that it won't affect their new instances?

[gmeister2]

Link to forum:
http://forum.codeigniter.com/thread-78985.html