 This paper discusses how testing can be used to assess the level of formation of the information thematic component of translator's information competency. A thematic network was developed as a tool to help students develop this component. Testing was conducted on the basis of the developed thematic network, and the results were analyzed to determine the level of formation of the information thematic component of students' information competency. The paper also proposes criteria and principles for selecting test tasks for each testing stage, and provides an example of the ratio of test tasks of different types and complexity at the determined testing stages. An experimental study was conducted to evaluate the effectiveness of the developed testing system. This article was authored by Rostislav Oterosenko, Svitlana M. Amelina, and Albert A. Azarian.