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unit-test-json-serialization

Validate Java object JSON serialization with Jackson and Spring @JsonTest.

Updated Apr 5, 2026
Search Tags:#json#unit-testing#serialization#deserialization#json-test#junit-5#jackson
One-click install
npx skills add https://github.com/rizaldiem/digital-invitation-web_V2 --skill unit-test-json-serialization-rizaldiem
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: unit-test-json-serialization
Source: https://github.com/rizaldiem/digital-invitation-web_V2/tree/main/.windsurf/skills/unit-test-json-serialization
Command: npx skills add https://github.com/rizaldiem/digital-invitation-web_V2 --skill unit-test-json-serialization-rizaldiem

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Ensures JSON serialization and deserialization behave as expected so tests catch mapping regressions, incorrect field names, date formatting issues, and custom serializer/deserializer bugs before they reach production.

Core Features & Use Cases

  • Focused @JsonTest usage to run JacksonTester-backed tests without loading the full Spring context.
  • Serialization and deserialization checks for DTOs, lists, nested objects, polymorphic types, and null handling.
  • Custom serializer/deserializer verification and date/time format validation using JsonPath and assertion helpers.
  • Use Case: Verify that a payment DTO serializes with the correct property names and that a custom BigDecimal serializer produces the expected string format.

Quick Start

Autowire a JacksonTester for your DTO in a @JsonTest and assert that writing and parsing a sample JSON produces the expected object fields and formats.

Frequently Asked Questions about unit-test-json-serialization

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I test JSON serialization and deserialization in Spring without loading the full application context?▼

Use the @JsonTest annotation to run focused JacksonTester-backed tests, validating DTO serialization and deserialization without the overhead of a full Spring context load. It isolates Jackson mapping behavior for fast, reliable JSON tests.

How do I verify custom Jackson serializers and deserializers in a unit test?▼

Verify custom Jackson serializers and deserializers by autowiring a JacksonTester in a @JsonTest, then asserting the serialized JSON output and parsed objects match expected formats and behaviors using JsonPath and assertion helpers.

How do I test date and time formats in JSON mappings using Jackson?▼

Test date and time formats by applying @JsonFormat to your DTO fields and validating the serialized JSON output within a @JsonTest, ensuring the JacksonTester correctly processes the expected string patterns for date and time fields.

Can I test polymorphic types and nested JSON structures with JacksonTester?▼

Yes, you can test polymorphic types and nested JSON structures using JacksonTester within a @JsonTest, verifying that complex object mappings, nested DTOs, and null handling serialize and deserialize correctly.

Does JacksonTester support JsonPath assertions for validating JSON properties?▼

Yes, JacksonTester supports JsonPath assertions to validate specific JSON properties and structures, allowing precise verification of @JsonProperty field names and custom serialization outputs within your Spring unit tests.

What is the best way to test BigDecimal serialization formats in Java DTOs?▼

Test BigDecimal serialization by implementing a custom JsonSerializer and verifying its output string format using JacksonTester in a @JsonTest, ensuring the numeric values match the expected decimal representation in the JSON payload.

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