Move useful helper methods for working with entities from EntityKernelTestBase to a trait

joachim → changed the visibility of the branch 3224276-move-entity-helpers-to-KernelTestBase to hidden.

joachim → changed the visibility of the branch 3224276-10.1-move-entity-helpers-to-KernelTestBase to hidden.

Resolved all points from @xjm in a new branch 3224276-11-move-entity-helpers-to-KernelTestBase off 11.x.

I'm coming round to the idea of a trait -- it means it can be used in functional tests too.

Making a new branch for that approach.

Also, once this is in, we can add #3267404: Add a PHPUnit assertion that an entity is valid → to this new trait too.

Checked the threads from the old MR 3043 and they all seemed to have made it into the 11.x MR 8721

Moving these to a trait seems like a good idea. Not sure if it will need a CR though for contrib to use the new trait? But won't hold on that.

I read the IS, comments and the MR. I found that all questions have been answered and I have no recommendations. Leaving at RTBC.

Committed and pushed adb813c5de to 11.x and 2975de0ee7 to 10.4.x. Thanks!

Automatically closed - issue fixed for 2 weeks with no activity.