A display panel and a display test apparatus and a method of testing the display panel are provided. The display panel includes an array substrate; a test device disposed on the array substrate and configured to receive a test signal from a display test apparatus to test a plurality of pixel units of the display panel; and a connection device disposed on the array substrate and configured to be electrically connectable to the display test apparatus electrically, the test device receives a discharge signal from the display test apparatus to discharge the plurality of pixel units in response to a switch of a connection state between the connection device and the display test apparatus from electrical connection to electrical disconnection.