unit-test-json-serialization

Use @JsonTest with JacksonTester to validate JSON serialization and deserialization of POJOs. @JsonTest provides a lightweight test context that loads only Jackson configuration without the full Spring context, enabling fast assertion of serialized JSON structure, field mapping, and values using AssertJ and JsonPath.

Yes. @JsonTest supports custom serializers and deserializers, allowing you to verify they correctly transform POJOs to JSON and parse JSON back to objects with proper handling of field names, nested structures, and null values without launching the full Spring context.

Use @JsonTest with JacksonTester to assert that DTOs serialize with correct field names, including date formats and nested object structures. This approach catches property-naming mismatches and ensures Jackson configuration applies correctly before integration testing.

No. @JsonTest provides a focused test slice that loads only Jackson and JSON configuration, making serialization tests fast and lightweight. This is ideal when you only need to validate JSON mapping behavior without database, web layer, or other Spring components.

@JsonTest with AssertJ and JsonPath lets you assert null handling, missing fields, and nested object behavior in serialized JSON. You can verify Jackson's configuration for null inclusion, empty collections, and field omission to ensure consistent deserialization.