Display panel, display device and test method thereof

The invention discloses a display panel, a display device and a test method thereof, and relate to the field of the display panel with a function of detecting a terminal connection condition. The display panel can utilize a detection unit to carry out electrical detection on the combination condition between a terminal of an integrated drive circuit and connection gaskets, and manual visual detection is not needed. The display panel comprises a base plate; a plurality of first signal wires which are arranged on the base plate and have the connection gaskets; a testing wire which is arranged on the base plate; a plurality of switch elements which are arranged on the base plate, input ends of the switch elements are connected with the testing wire, and the output end of each switch element is connected with one of the first signal wires correspondingly; a control line which is arranged on the base plate and connected with control terminals of the switch elements; and the integrated drive circuit and a test cell.