MockStore selectors resulting in warning logs

[timdeschryver]

Minimal reproduction of the bug/regression with instructions:

Currently all the tests that use a mockstore with mocked selectors, will log the warning that the state does not exists.

This is normal because when we define a mocks store, we don't define the state object.

Expected behavior:

It should not be logged while running tests.

Versions of NgRx, Angular, Node, affected browser(s) and operating system(s):

Angular 9
NgRx 9-beta.1

Other information:

AFAIK, it isn't possible to detect when we run in a test environment.
But we could set a property on the state (__ngrxMockEnvironment__), and the createFeatureSelector could use this property to check if it the warning has to logged or not.

I would be willing to submit a PR to fix this issue

[ ] Yes (Assistance is provided if you need help submitting a pull request)
[ ] No

[evgenyfedorenko]

I can take this one.

[evgenyfedorenko]

@timdeschryver can you please give me the example of the test which produces that warning?

[timdeschryver]

@evgenyfedorenko the example tests log them, run

yarn test:example