Poor results do not necessarily mean your idea doesn't have any potential! Whether the results are good, poor, or average, you'll get lots of insights and feedback from your market. The test results will help you to refine and improve, and to create a minimal viable product. Successful innovation is about a continuous cycle of learning and improvement.
It's up to you whether you want to share your test results with investors and partners - you own the results, and are free to share them or not.