The article reveals the role of computer-based tests as an integral component of an EFL course for non-linguistic students who need to communicate effectively in English. In this article computer-based tests are considered effective up-to-date means of control. In addition to this, the role of electronic tests in optimization of the teaching process is reviewed. Electronic English grammar tests, developed for the students and postgraduates studying at the Computer Science Department of Tomsk State University, were compiled to correspond to the content and the level of difficulty and to comply with the students' individual needs. We give reasons for our choice of the Virtual Learning Environment Moodle and its Quiz module to deploy the tests.