A method of testing a Bluetooth low energy device over-the-air is described, wherein a Bluetooth low energy connection is established. An enable test mode command is transmitted to the device under test. The testing is started with transmitting at least one of a test transmission command and a test receiving command. Test radio frequency test physical layer packets are transmitted in a channel to be tested. A channel switching sequence takes place. At least one of a stop transmission command and a stop receiving command is transmitted once the intended testing on the channel to be tested has been completed. Further, a testing system is described.