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Unit Test Json Serialization

giuseppe-trisciuoglio/developer-kit

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.

skills.sh installs
3.9K
GitHub stars
369
last updated
Aug 21, 2026
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Install

$ npx -y skills add giuseppe-trisciuoglio/developer-kit --skill unit-test-json-serialization --agent claude-code

Installs into .claude/skills of the current project.

Files

Unit Testing JSON Serialization with @JsonTest

Overview

Provides patterns for unit testing JSON serialization and deserialization using Spring's @JsonTest and Jackson. Covers POJO mapping, custom serializers, field name mappings, nested objects, date/time formatting, and polymorphic types.

When to Use

  • Testing JSON serialization/deserialization of DTOs
  • Verifying custom Jackson serializers/deserializers
  • Validating @JsonProperty, @JsonIgnore, and field name mappings
  • Testing date/time format handling (LocalDateTime, Date)
  • Testing null handling and missing fields
  • Testing polymorphic type deserialization

Instructions

SKILL.md on GitHub

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Details

Repository
github.com/giuseppe-trisciuoglio/developer-kit
Categories
Testing & QA, Documentation, Java & JVM
First seen
May 16, 2026

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