unit-test-config-properties
Test Spring @ConfigurationProperties bindings, validation, and type conversions without full context startup.
- Use
ApplicationContextRunnerto test property binding in isolation, covering simple properties, nested structures, collections, and type conversions - Verify validation constraints with
@Validatedannotations, ensuring invalid values fail appropriately and valid configurations pass - Test default values, profile-specific configurations, and property name mapping (kebab-case to camelCase conversion)
- Covers Duration, DataSize, List, Map, and Charset type conversions with practical examples for each
Unit Testing Configuration Properties and Profiles
Overview
This skill provides patterns for unit testing @ConfigurationProperties bindings, environment-specific configurations, and property validation using JUnit 5. Covers testing property name mapping, type conversions, validation constraints, nested structures, and profile-specific configurations without full Spring context startup.
Key validation checkpoints:
- Property prefix matches between
@ConfigurationPropertiesand test properties - Validation triggers on
@Validatedclasses with invalid values - Type conversions work for Duration, DataSize, collections, and maps
When to Use
- Testing
@ConfigurationPropertiesproperty binding - Testing property name mapping and type conversions
- Validating configuration with
@NotBlank,@Min,@Max,@Emailconstraints - Testing environment-specific configurations (dev, prod)
- Testing nested property structures and collections
- Verifying default values when properties are not specified
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