703-technologies-fuzzing-testing
Use when you need to add or review fuzz testing for Java APIs with CATS — including contract-driven negative testing, malformed payload validation, boundary input exploration, CI integration, reproducible failures, and local execution guidance. This should trigger for requests such as Add fuzz testing to a Java project; Use CATS for API negative testing; Review CI quality gates for API contract robustness; Improve boundary and malformed input test coverage. Part of cursor-rules-java project
What this skill does
# Java fuzz testing with CATS Design and implement contract-driven fuzz testing for Java APIs using CATS to uncover edge cases and input-validation defects early. **What is covered in this Skill?** - CATS setup and baseline command usage for OpenAPI-driven fuzzing - Negative testing strategy for invalid payloads, missing fields, wrong types, and malformed values - Boundary testing for size, range, format, and enum constraints - CI integration patterns with actionable logs and reproducible failures - Local execution workflow for contributors before opening pull requests - Reporting and triage practices for fuzzing findings **Scope:** Focus on HTTP API fuzzing and contract validation with CATS. Use this skill to define practical, repeatable checks in both local and CI workflows. ## Constraints Before applying any fuzz testing changes, ensure the project compiles. If compilation fails, stop immediately. After implementation, regenerate skills and run verification. - **MANDATORY**: Run `./mvnw compile` or `mvn compile` before applying any change - **SAFETY**: If compilation fails, stop immediately and do not proceed - **MANDATORY**: Regenerate skills with `./mvnw clean install -pl skills-generator` after editing skill XML - **VERIFY**: Run `./mvnw clean verify` or `mvn clean verify` after applying improvements - **BEFORE APPLYING**: Read the reference for detailed examples, good/bad patterns, and constraints - **EDGE CASE**: If request scope is ambiguous, stop and ask a clarifying question before applying changes - **EDGE CASE**: If required inputs, files, or tooling are missing, report what is missing and ask whether to proceed with setup guidance ## When to use this skill - Add fuzz testing to a Java project - Use CATS for API negative testing - Review CI quality gates for API contract robustness - Improve boundary and malformed input test coverage ## Workflow 1. **Read reference and assess project context** Read `references/703-technologies-fuzzing-testing.md` and inspect current API/context artifacts before proposing changes. 2. **Gather scope and decide target improvements** Identify requested outcomes, constraints, and the minimum safe set of changes to apply. 3. **Apply technology-aligned changes** Implement or refactor artifacts following the reference patterns and project conventions. 4. **Run verification and report results** Execute appropriate checks and summarize what changed, what was verified, and any follow-up actions. ## Reference For detailed guidance, examples, and constraints, see [references/703-technologies-fuzzing-testing.md](references/703-technologies-fuzzing-testing.md).
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