There really is no way to determine with a knot strength test the value of any knot as many issues related cannot be determined with a simple stretch test, that said, tie my knot correctly and you should have no problem.
If it holds well enough for a 12lb brown to 5x what more can you ask for.

The 3 main reasons why knots fail are related to,,
Not tying the knot correctly.
Anglers response to setting the hook.
Using a rod action not suited to fishing fine leader/tippet

Davy W