“…These points collaborate with test activities leading to produce a high-quality software product [35]. The huge majority of the included papers mentioned software testing activity [27,6,31,19,4,21,11,34,25,26,35,33,41,22,12,8,10,28,23,29,30,9,40]. Unit test is the most common test approach in OSS development [11] followed by pre-release testing [11,26,25].…”