Support passing preconfigured messages when testing Subscribers

[fritz-gerneth]

Resolves #18

[DavidBadura]

Thanks! I just have one small request.

[DanielBadura]

Lowest tests are failing due to not handling the RecordedOnHeader pre version 3.13.0. e.g. in 3.10.x as used in the tests: https://github.com/patchlevel/event-sourcing/blob/3.10.x/src/Subscription/Subscriber/ArgumentResolver/RecordedOnArgumentResolver.php#L14-L17

I would say, bump the event-sourcing dep to ^3.13.0 as this is the first version supporting the header in the resolver: https://github.com/patchlevel/event-sourcing/blob/3.13.x/src/Subscription/Subscriber/ArgumentResolver/RecordedOnArgumentResolver.php#L15-L22

Other option would be to use the AggregateHeader instead in the test.

[fritz-gerneth]

Other option would be to use the AggregateHeader instead in the test.

I read that class / approach as somewhat deprecated over using dedicated headers?

[DanielBadura]

Yes, AggregateHeader is already removed in the 4.0.x branch. But we don't need to account this here currently imho. We can adjust this as soon this package only supports the new major version.