unit-test-mapper-converter
Unit testing patterns for MapStruct mappers and custom converters with comprehensive transformation validation.
- Covers field mapping accuracy, null handling, type conversions, nested objects, bidirectional mapping, enum mapping, and partial updates
- Includes Maven and Gradle setup with MapStruct, JUnit 5, and AssertJ dependencies
- Provides patterns for testing simple mappings, nested hierarchies, custom
@Mappingannotations, enum@ValueMapping, and@MappingTargetpartial updates - Demonstrates round-trip validation, recursive comparison for complex structures, and null input handling across all mapper scenarios
Unit Testing Mappers and Converters
Overview
Provides patterns for unit testing MapStruct mappers and custom converter classes. Covers field mapping accuracy, null handling, type conversions, nested object transformations, bidirectional mapping, enum mapping, and partial updates.
When to Use
- Writing mapping tests for MapStruct mapper implementations
- Testing custom entity-to-DTO converters and bean mappings
- Validating nested object mapping and collection transformations
Instructions
1. Validate Generated Mapper Classes
Before testing, verify generated mapper classes exist:
# Maven
ls target/generated-sources/
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