Testory - a first of a kind MBT (Model Based Testing) development platform allowing programmers and testers to build simulated environments for complex reactive systems. Whether the SUT (system under test) is a WEB application, operation management system, microservices, or API, the Testory platform automatically generates a simulation that engages with the tested system and validates its integrity and quality. It automatically maps, prioritizes, and executes all the needed scenarios to test the SUT. It enables the development team to continuously test system behaviors and easily maintain the test plan as system functionality evolves over time. Testory allows programmers and testers to improve their software early in the software design process, in some cases even before they start to write code (“Shift-Left”), reducing time and effort. The platform provides algorithms for root cause analysis through adaptive scenario generation and supports Go/No-Go decisions with statistically supported reports.