unit-test-json-serialization
Unit testing JSON serialization and deserialization with Spring's @JsonTest and Jackson.
- Covers serialization/deserialization of POJOs, custom serializers/deserializers, field name mappings with
@JsonProperty, and null handling using JacksonTester for type-safe assertions - Includes patterns for testing nested objects, lists, date/time formatting, and polymorphic types with
@JsonTypeInfo - Provides Maven and Gradle setup, best practices for avoiding circular references and null inclusion issues, and troubleshooting guidance for common Jackson configuration problems
- Uses
@JsonTestannotation for lightweight JSON-focused test context without full Spring application startup
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
- Annotate test class with
@JsonTest→ Enables JacksonTester auto-configuration - Autowire JacksonTester for target type → Provides type-safe JSON assertions
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