How do I test profile-specific properties with this skill?

The skill demonstrates how to use the .withPropertyValues method to simulate active profiles, ensuring your configuration behaves correctly across dev, test, and prod.

Why use ApplicationContextRunner instead of @SpringBootTest?

ApplicationContextRunner is significantly faster because it doesn't start the full application context, making it ideal for isolated, high-speed configuration unit tests.

Can this skill handle nested properties and lists?

Yes, it provides specific implementation patterns for testing complex hierarchical structures and indexed collection bindings commonly found in application.yml files.

Does it support Jakarta/JSR-303 validation testing?

Absolutely. It includes patterns to verify that @Min, @Max, @NotBlank, and other constraints correctly trigger failures when invalid values are provided.

Spring Boot Configuration Unit Testing

Name: Spring Boot Configuration Unit Testing
Author: giuseppe-trisciuoglio

bygiuseppe-trisciuoglio

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126

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Security & Testing

Streamlines unit testing for Spring Boot @ConfigurationProperties using ApplicationContextRunner for fast and reliable configuration validation.

The Spring Boot Configuration Unit Testing skill provides standardized patterns for verifying application configuration binding without the overhead of a full Spring context startup. It enables developers to rigorously test property name mapping, complex nested structures, type conversions (like Duration and DataSize), and @Validated constraints. By leveraging the ApplicationContextRunner, this skill ensures that configuration classes are robust, correctly defaulted, and environment-aware, significantly reducing runtime errors caused by misconfigured properties during deployment.

Key Features

01Verification of nested structures and indexed collection bindings

02Context-free property binding verification using ApplicationContextRunner

03126 GitHub stars

04Validation constraint testing for @Validated configuration classes

05Type conversion testing for Duration, DataSize, and custom collections

06Profile-specific configuration testing for multi-environment support

Use Cases

01Testing environment-specific bean overrides and profile-dependent properties

02Ensuring mandatory configuration fields trigger validation failures when missing

03Verifying that complex YAML/properties files map correctly to Java POJOs

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add giuseppe-trisciuoglio/developer-kit unit-test-config-properties

For use in Claude.ai and ChatGPT

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