1. A method of identifying a boundary of a field of a text-based screen for a test tool, the text-based screen being associated with a screen Java object, a text-based screen having a text area, the text-based screen having a plurality of text-based fields in the text area, the text-based fields being associated with respective field Java objects, comprising: associating a screen proxy Java object with the screen Java object, the screen proxy Java object being accessible to the test tool; associating field proxy Java objects with respective field Java objects, the field proxy Java objects being accessible to the test tool; determining a starting screen pixel location of the text area of the screen Java object; determining a text-based row, a text-based starting column and a text-based ending column which is associated with one of the field Java objects that is associated with a particular field proxy Java object; determining a field corner pixel location based on the text-based row, the text-based starting column and the starting screen pixel location; determining a field pixel width based on the text-based starting column and the text-based ending column; determining a field pixel height of the text-based row; and providing the field corner pixel location, the field pixel width and the field pixel height to the test tool.