Software quality is seen as an integral part of Software Engineering education. A key concept is software testing, the primary method used in the industry to evaluate the software quality. In this article, we focus on software testing assessment. We present 3 contributions: (1) the adaptation of our online learning open platform (Caseine) for software testing assessment, (2) an approach to create testing exercises, and (3) a (still) modest set of exercises (but currently under extension).