Danger, may contain discouraging news.
What happens with me and fruit (believe me, I test A LOT, because I love it): Fruit and anything else containing "natural sugars" will spike me WITHIN AN HOUR from first bite, and then drop to normal. So my tests with fruit tend to be "how much of that can I have without peaking over 120?"
A carb is not a carb in my system. For instance I recently braved some rice and spiked for hours, peaking around 1.5. But last night I had some naan (usually one of my worst triggers) and was at 73 in 2 hours.
On the up side? I'm OK with blueberries too, less than a handful a time, and not more than once a week.