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unit-test-mapper-converter

Generate JUnit 5 unit tests for MapStruct mappers and custom converters.

Updated Mar 2, 2026
Search Tags:#testing#mapper#converter#dto#entity#mapstruct#junit 5
One-click install
npx skills add https://github.com/MassimilianoPili/claude-code-config --skill unit-test-mapper-converter-massimilianopili
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: unit-test-mapper-converter
Source: https://github.com/MassimilianoPili/claude-code-config/tree/main/skills/unit-test-mapper-converter
Command: npx skills add https://github.com/MassimilianoPili/claude-code-config --skill unit-test-mapper-converter-massimilianopili

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill ensures that your data mappers and converters (like MapStruct) accurately transform data between different object types (e.g., DTOs to entities) and handle various scenarios like nulls, nested objects, and custom logic.

Core Features & Use Cases

  • MapStruct Testing: Write robust unit tests for MapStruct interfaces.
  • Custom Converter Validation: Test your own converter classes.
  • Scenario Coverage: Verify mapping for simple fields, nested objects, enums, and custom transformations.
  • Use Case: Before deploying, use this Skill to confirm that your UserDto to User entity mapping correctly handles all fields, including nested Address objects and potential null values.

Quick Start

Use the unit-test-mapper-converter skill to generate a JUnit 5 test for a MapStruct interface named OrderMapper that converts OrderDto to Order entities.

Frequently Asked Questions about unit-test-mapper-converter

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

FAQPage Schema
How do I test MapStruct mappers to ensure accurate object transformation?▼

Generate JUnit 5 unit tests for MapStruct mappers to validate field mapping accuracy, null handling, type conversions, and nested object transformations in isolation, ensuring data integrity between DTOs and domain objects before integration.

What is the best way to verify custom converter logic for nested DTO and entity mappings?▼

Verify custom converter logic by writing unit tests that isolate object transformation logic, checking field mapping accuracy, null handling, and nested object transformations to confirm data integrity before deploying.

Does this approach support testing null handling and type conversions for DTOs?▼

Yes, testing null handling and type conversions for DTOs is supported through generated unit tests that validate these specific scenarios alongside simple field mapping and nested object transformations.

Can I use JUnit 5 to test custom converter classes that map enums and nested objects?▼

Yes, you can use JUnit 5 to test custom converter classes. The generated tests cover scenario coverage including enums, nested objects, and custom transformations to validate mapping logic comprehensively.

Why do my DTO to entity mappings fail during data transformation despite passing integration tests?▼

DTO to entity mappings often fail because nested object transformations and null handling are not tested in isolation. Generating dedicated unit tests for mappers validates these specific data integrity scenarios before integration.

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