The Littlebits Arduino controller uses a different pin for LED output. An Arduino Uno uses pin 13, the Littlebits Leonardo board uses pin 5. The tests for the first workshop verify the pin settings of the program; which breaks in this case.
To reproduce: try and verify a working "blink" solution with Johnny-Five and a LIttleBits Arduino kit. Alertnatively, you can try changing the Led to something instead of 13, and you'll see the test breaking when it encounters the wrong pin number.