IBM Bob Generates Negative Tests for Your Java API — Find What You Missed in 5 Minutes
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You test the happy path. But what happens when the input is null, blank, or completely wrong? That's where bugs hide.
In this video, Alex Soto uses IBM Bob to scan a Quarkus REST endpoint, identify negative test cases, and implement them — catching validation gaps that manual testing typically misses. Bob analyzes the user registration endpoint, produces a full report of negative scenarios, then generates JUnit test cases using the Quarkus test framework. When the tests fail on the first run, Bob reads the error, identifies the mismatch, and fixes it autonomously.
🔹 What you'll see in this video: — Prompting Bob as a tester to identify negative test cases for a specific endpoint — Bob analyzing the endpoint, its dependencies, and producing a structured report of edge cases — Implementing the first two negative test cases with JUnit and Quarkus Test — Bob generating descriptive display names referencing the original scan findings — First test run fails on a JSON path mismatch — Bob reads the error and self-corrects — All tests passing on the second run
📌 Key takeaway: Developers test the happy path. Bob finds the unhappy ones. Five minutes from prompt to passing negative tests — including the fix cycle.
🔗 Try IBM Bob: ibm.com/bob
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