I know you are thrilled to have finally met a young woman who is serious about her faith, but I am actually very concerned about your situation for several reasons:
1. She seems to already trust you and is practically giving you her heart. No doubt she is as thrilled as you are to feel like she's found a good guy, especially after her past. This may seem like a good thing, but once things reach this point you have the potential to completely devastate her emotionally if things don't "work out." In other words, go slowly!
2. You are setting yourself up for an inevitable conflict with your parents. I don't know how to avoid this, but again I think you will have to go slowly! Hopefully others will have more wisdom about this situation.
3. I am not a fan of your "test." Do you really want to bring a woman who is not your wife into your bedroom in the middle of the night or at any other time? First of all, you are practically begging for temptation. It is like someone on a diet going into the donut shop to look at the donuts without breaking his or her diet. It would be much easier to stick to the diet by avoiding the donut shop. Furthermore, anyone who sees a woman going into your house, much less your bedroom, in the middle of the night is going to draw conclusions about what the two of you are doing. You don't have to do anything for her reputation, and yours, to be damaged.
When you are alone with a woman, you are responsible for her honor! I repeat, you are responsible for her honor! Even appearances of impropriety can damage her honor. My biggest regret from my relationship with my wife prior to getting married is that I didn't protect her honor as much as I should have. I rationalized my actions by telling myself that we weren't sinning based on technicalities, but I was really deceiving myself. Some people might think it's not a big deal because we got married anyway, but it's a big deal to me.
I'm not trying to imply that you are a terrible person here, I just want you to be careful.