In today’s scenario, the software validation phase in the automotive software development cycle uses different testing environments/platforms (Verification uses Model in Loop (MiL), function validation uses Software in Loop (SiL), HW and system level tests uses Hardware in Loop (HiL), and system testing uses vehicle). Each of these platforms are highly expensive to deploy and maintain and poses significant constraints in directly comparing the test results across platforms due to the difference in test reporting structures. It is also noticed that there is high redundancy or overlapping of test cases and timely availability of these platforms for timely SW release testing. The solution helps in integrating MiL, SiL, and HiL test platforms into one single "Integrated Testing Platform," which eventually saves testing time, effort, and cost, along with early bug detection during the software development phase. With the reuse of relevant compatible test cases in each of the test phases, test-case redundancy is eliminated, thus reducing total man-hours spent in creating similar tests in different environments at different phases for the same function. Additional benefits include improved test-case coverage and fault reaction testing on digital platforms. Each of the platforms are compatible with a single reporting tool (e.g., CANape logs), thus streamlining the test report format. In this manner, HiL and vehicle test platforms can be dedicated to hardware/system-specific tests, and application layer logic can be tested via this platform during the early stage of software development. The closed-loop digital validation platform includes plant model, SiL, and HiL connected with each other via Silver [3] and PROVEtech [2] tool wherein PROVEtech [2] acts as a master for controlling and Silver [3] serves as the backbone for all the test simulations. The results from this platform have a standard format and thus can be compared and analyzed via a standard analysis tool. This helps in easy reporting structure across different platforms.