Can I test list and array serialization with these patterns?

Absolutely. The skill provides examples for testing both individual POJOs and collections (Lists) of objects to ensure entire JSON arrays are mapped correctly.

Why use @JsonTest instead of a full @SpringBootTest?

@JsonTest is a specialized test slice that only initializes JSON-related components, making it significantly faster and more focused on mapping logic than a full integration test.

Does this skill support testing for Java 8 Date/Time types?

Yes, it includes specific patterns for verifying that LocalDateTime and other temporal types are formatted correctly according to your Jackson configuration.

How do I test custom field names using this skill?

The skill demonstrates using JacksonTester in combination with AssertJ's extractingJsonPath to verify that @JsonProperty annotations correctly map Java fields to specific JSON keys.

JSON Serialization Unit Testing

Name: JSON Serialization Unit Testing
Author: pur3v4d3r

bypur3v4d3r

•

セキュリティとテスト

Automates the validation of Java object mapping to JSON and vice versa using Spring Boot's @JsonTest and Jackson.

概要

This skill provides a comprehensive set of patterns and best practices for unit testing JSON serialization and deserialization in Java Spring Boot applications. By leveraging the @JsonTest annotation and JacksonTester, it enables developers to verify DTO mappings, custom serializers, date formatting, and polymorphic type handling without the overhead of a full application context. This is essential for ensuring that API data contracts remain robust, field mappings like @JsonProperty are respected, and complex nested structures are correctly transformed during data exchange.

主な機能

Precise verification of date/time formatting and temporal types
Testing for polymorphic deserialization and null-handling logic
Validation of custom Jackson serializers and deserializers
1 GitHub stars
Focused slice testing with Spring Boot @JsonTest
Assertion patterns for complex nested JSON structures

ユースケース

Ensuring backward compatibility of JSON structures during DTO refactoring
Testing custom serialization logic for sensitive data or monetary values
Validating that API DTOs strictly adhere to defined JSON schemas

概要

主な機能

Precise verification of date/time formatting and temporal types
Testing for polymorphic deserialization and null-handling logic
Validation of custom Jackson serializers and deserializers
1 GitHub stars
Focused slice testing with Spring Boot @JsonTest
Assertion patterns for complex nested JSON structures

ユースケース

Ensuring backward compatibility of JSON structures during DTO refactoring
Testing custom serialization logic for sensitive data or monetary values
Validating that API DTOs strictly adhere to defined JSON schemas