摘要：In th.s paper we describe h.w th. test design can be done by using th. Combinatorial Testing approach.for internet of th.ngs operating systems. Contiki operating system is taken as a case study but we discuss wh.t can be th. approach.for RIOT and Tiny OS operating systems. We discuss h.w th. combinatorial coverage measurement can be gath.red in addition to th. traditional metrics code coverage. Th. test design generated by using Advanced Combinatorial Testing for Software is analyzed for Contiki operating system. We elaborate th. code coverage gath.ring tech.ique for Contiki simulator wh.ch.h.ppens to be in Java. We explain th. usage of Combinatorial Coverage Measurement tool. Alth.ugh.we h.ve explained th. test design meth.dology for internet of th.ngs operating systems, th. approach.explained can be followed for oth.r open source software.