As the use of mobile learning educational applications has become more common anywhere in the world, new concerns have appeared in the classroom, human interaction in software engineering and ergonomics. new tests of foreign languages for a number of purposes have become more and more common recently. However, studies interrelating language tests and ergonomics have lagged behind to the point that there is a clear lack of balance between software for m-learning and the capacities of modern equipment. This paper is based on the experience acquired through the use of mobile phones emulators for language testing. The paper does not deal with the experimental phase itself but suggests the constraints found in such experimentation from a descriptive perspective. (Contains 3 figures.) [Funding for this research was provided by the Ministry of Science and Innovation. This paper was published in the proceedings of the 14th International Conference on Interactive Collaborative Learning (ICL2011)--11th International Conference Virtual University (vu'11), 21-23 September 2011, Piestany, Slovakia, p95-97 (ISBN-978-1-4577-1746-8).]