If a girl randomly sits on my lap and wraps her arm around me does she like me? Is she just testing me out?

My friend was trying to hook me up with some chick so he brought me to meet her at a park bench. She immediately sat on my lap, put her arms around me , and we talked a little. I felt like there was something there but she eventually got up and left. Not sure if she's teasing me or what. I probably shouldn't read too much into and keep feeling her out.
If a girl randomly sits on my lap and wraps her arm around me does she like me? Is she just testing me out?
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