A test apparatus for a display includes an interface transmitting characteristic information including a resolution of the display unit and each equivalent model of a plurality of pixels, a reference voltage model including a plurality of reference voltages respectively corresponding to a plurality of pixels included in a unit region of the display unit, and pixel information including a position of a plurality of pixels to be tested among a plurality of pixels, a pixel model generator that schematizes a plurality of pixels into a plurality of test pixels and at least one equivalent load pixel according to the characteristic information and the pixel information to generate a pixel model, and a voltage mapper that maps the reference voltage model to the pixel model to calculate test voltages respectively corresponding to a plurality of test pixels and the equivalent load pixel.