Integration Tests (for an asset) in the Editor Test Runner?

In my current project I would like to have several integration tests (implemented in a test scene). I am currently using Unity 5.4.

A few Unity versions ago, this would have only been possible with the Unity Test Tools, downloaded separatedly.

However, currently the Editor Test Runner included with Unity can, at least, run unit tests. I would prefer to not add the Unity Test Tools as a dependency because I actually want to publish my project as an Asset in the Asset Store, and that would (I believe) be an issue.

Thus, in short, the main question is:

1) Is there, in the current version of Unity (5.4) (or in upcoming ones?), any way to run Integration Tests through the included Editor Test Runner?

And failing that (no way to run Integration Tests without the separate Unity Test Tools), a sub-question would be:

2) What is the recommended way to add Integration Tests to a project that is meant to be published as an Asset in the Asset Store? Packacking the Unity Test Tools into the asset does not seem to be an option because users would get conflicts, and failing to package it into the asset does not seem to be a good option either because it would (I think) lead to errors if the users do not also import the Unity Test Tools.