Summary
If you're writing Spring Boot apps with Jackson, you'll eventually need to verify your DTOs serialize correctly. This gives you patterns for @JsonTest with JacksonTester, covering the essentials like field name mappings with @JsonProperty, custom serializers, nested objects, and polymorphic types. The examples are practical: testing that your API responses actually match what you expect, handling null fields properly, and validating date formats don't break between versions. It's focused on unit testing the JSON layer in isolation, not integration tests. Honestly, this is one of those things you set up once per project and then copy the pattern everywhere.
Install to Claude Code
npx -y skills add giuseppe-trisciuoglio/developer-kit --skill unit-test-json-serialization --agent claude-codeInstalls into .claude/skills of the current project.
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belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Plug Mailtrap into your AI workflow and let it handle the email.
Connect Mailtrap MCP →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →Make coding agent sessions - Searchable, Shareable, Vendor-neutral & Scored.
Try For Free →Your agent targets a perfect 10 Code Health score. Deterministic. Every commit.
Try For Free →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →