Most everyone has tried the flash based SpeakEasy Internet Speed Test. Recently, SourceForge introduced a HTML5 speed test that doest not require Flash or Java. It works on all devices including tablets and smart phones without needing to install an App.
You can try it here: https://sourceforge.net/speedtest/. The image below is for a Verizon Fios Business connection with advertised speeds of 25 Mbps up and down.