Beyond Human Tester Limits - Nikhil Barthwal

Unlocking the Secrets of Property-Based Testing In this episode, I chat with Nikhil Barthwal about property-based testing. We go into how property-based testing can uncover the hidden bugs that often slip past human testers. With its capacity to automatically generate a multitude of test cases, this method helps us see beyond typical limitations. Nikhil also shares when property-based testing may not be ideal, like when it incurs high resource costs. He emphasizes that this approach serves as an assistant to testers rather than a replacement, enhancing productivity and reliability. "When the system gets too complicated it is not possible for humans to write every test cases." - Nikhil Barthwal Nikhil Barthwal is passionate about developing decentralized systems. He has several years of professional experience in large corporations as well as in smaller start-ups and acts as a mentor for various start-ups. He is also a guest speaker at various international conferences and gives talks on topics related to decentralized systems and software quality. Highlights: Property-based testing generates thousands of test combinations automatically from a formal description of system behavior, reaching failure modes no human-authored test suite can anticipate. In distributed systems with many services, the number of possible failure combinations grows exponentially, making manual test case authorship impractical at scale. The shrinker component is what makes property-based testing usable: it reduces a long generated failure sequence to the precise step where the fault occurred, so engineers can act on it. Property-based testing becomes costly where each test execution consumes billable resources, such as cloud storage writes or live network calls, because automated test volume can spiral expenses out of control. Introducing property-based testing in a large organization is primarily a cultural challenge: winning one willing team first, letting them advocate to peers, is more effective than a top-down rollout. 📌 Testing is a people business, humanity as a superpower. That is my talk on October 7 at HUSTEF 2026 in Budapest: See programme and tickets