  In industry, RESTful APIs are widely used to build modern Cloud Applications.
Testing them is challenging, because not only they rely on network
communications, but also they deal with external services like databases.
Therefore, there has been a large amount of research sprout in recent years on
how to automatically verify this kind of web services. In this paper, we review
the current state-of-the-art on testing RESTful APIs, based on an analysis of
92 scientific articles. This review categories and summarizes the existing
scientific work on this topic, and discusses the current challenges in the
verification of RESTful APIs.
