Why use ApplicationContextRunner instead of @SpringBootTest?

ApplicationContextRunner is significantly faster because it avoids starting the full application context. It is the recommended approach for unit testing configuration binding in isolation.

Does it support JSR-303 validation testing?

Yes, the skill provides implementation patterns for testing @Validated classes to ensure constraints like @Min, @Max, and @NotBlank are correctly enforced.

Does this support advanced type conversions?

Yes, it covers testing for Spring's built-in converters for types like java.time.Duration, DataSize, and custom Charsets.

Can this skill test nested configuration classes?

Yes, it includes specific patterns and examples for testing complex, nested configuration structures, maps, and list-based property binding.

How do I test profile-specific properties?

You can use the .withPropertyValues('spring.profiles.active=name') method within the context runner to simulate and verify different environment-specific profiles.

Spring Config Properties Unit Testing

Name: Spring Config Properties Unit Testing
Author: pur3v4d3r

bypur3v4d3r

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Security & Testing

Validates Spring Boot @ConfigurationProperties binding, validation, and profile-specific settings using lightweight context runners.

This skill provides standardized patterns for testing Spring Boot configuration property classes without requiring a full Spring context startup. It leverages the ApplicationContextRunner to efficiently validate property binding, nested structures, type conversions (like Duration and DataSize), and JSR-303 validation constraints. By using these patterns, developers can ensure their application configuration logic is robust and correctly mapped to environment variables or properties files while maintaining high-speed test execution and comprehensive coverage.

Key Features

01Support for complex nested property structures and collection binding

02Lightweight ApplicationContextRunner patterns for fast execution

03Automated type conversion testing for Duration, DataSize, and Charsets

04Environment and profile-specific configuration verification

05Validation testing for @ConfigurationProperties with JSR-303 constraints

061 GitHub stars

Use Cases

01Ensuring custom validation logic prevents invalid configuration from starting the service

02Validating that environment variables correctly map to application configuration objects

03Testing different configuration profiles to ensure security settings are correctly applied

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add pur3v4d3r/pur3-pkb-codebase unit-test-config-properties

For use in Claude.ai and ChatGPT

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