Testing the waters

There is a girl in a few of my classes who I am friendly with. We know each other, talk, text occasionally. The problem is I have let it get to the point were I am not sure if she is interested or just being friendly. I'm a shy guy and asking her out at this point is nerve racking. Is there thing I could do or say that would test the waters and see if she was interested short of asking her out?
Testing the waters
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