Well that went about as expected.
It did break along the glue joint, but it took a good bit of force.
The glue seemed to tear the residue from the wood fibers so I think my theory that good glue coverage is a must definitely holds up.
This is especially true because I see now that my glue didn’t spread evenly in the joint.
You can see the glue coverage was best along the top edge and when the joint tore apart it took the residue with it.
Take from this what you will; I assume this will be the weakest joint type because of the long straight joints. Curved shapes will probably hold up much better and I just can’t rip the precious up. Let us know if you do any experiments on this 