Add unit tests to ensure that EndpointRouteBuilder is fully supported

[essobedo]

To ensure that the feature described in #941 is fully covered/implemented, we would like to add unit tests and fix the code if needed.

[essobedo]

@ammachado Hi, as you worked on #941, would you be interested in working on this?

[ammachado]

@essobedo I'm traveling this week, and can't work on this.

[essobedo]

@ammachado there is no pressure on it, it could wait one week or two. For now, I'm just wondering if you were interested in doing the second part of the task #941 since you worked on the first part?

[ammachado]

I have done some testing here, and couldn't figure out yet how to fix this. Maybe @essobedo can take a look at this?