Key TakeawaysFortinet shares surged in premarket trading on Wednesday after the cybersecurity solutions provider raised its full-year revenue outlook, as enterprise customers increase spending to protect their data and applications from cyberattacks.The company's better-than-expected earnings report looks set create a bullish stock gap on the chart that could lead to a longer-term upside reversal.Amid a post-earnings rally, Fortinet shares could test important chart levels including $62.50, $69, and $73.50. ...