Add test helper for @Select

[splincode]

Feature Request

When I am unit testing my components that use a store, I often just want to mock the store to check whether the right dispatch methods were called.

However when the component contains @select you'll get a errors like:

Error: SelectFactory not connected to store!

Now we can use ugly hacks like the following to get rid of the errors:

Object.defineProperty(component, 'active$', { writable: true });
component.active$ = of([]);

But it would be nicer if we have the ability to have some helpers to mock the selects, or let the SelectFactory be mockable somehow.

See also: #482

[splincode]

@aymeric-duchein Could you help with this issue?

[aymeric-duchein]

I'll look into it, we might be able to provide a function that takes a selector and returns a Subject to allow you to trigger the component observable when you choose to.

[aymeric-duchein]

@splincode do you know when this could be published?

[splincode]

@aymeric-duchein published