Analyze the current state of research in software testing for SoS, specifically related to Software Testing; in order to summarize the state of the art of this research topic; regarding i) distribution of papers published so far, ii) application domain of the proposed studies, iii) testing approaches, iv) techniques (processes, frameworks or tools), and v) problems and limitations of current support to testing activities in the context of SoS; from the perspective of Software Engineering researchers with expertise in SoS; and in the context of studies published in academic venues (events proceedings and journals).