I don't see why we need to know exactly when and where Israel conducted its test(s) (at least those of us here in this thread), or even why Israel would have needed to conduct a test of its own. We know Israel has them. I expect that the question of whether or not Israel conducted tests is a bit of a diversionary tactic anyway. Israel was getting a lot of help from nuclear armed countries in the development of their weapons, so it's entirely possible that they could produce working nuclear weapons without ever having to conduct a test of their own (the tests having been done by the countries that developed the weapons that Israel was producing).


Israel's nuclear submarines


Some background...

http://www10.antenna.nl/wise/index.html?http://www10.antenna.nl/wise/593/5545.php


Sale of heavy water to Israel by the UK...

http://news.bbc.co.uk/2/hi/uk_news/4743987.stm