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name: cui-testing description: CUI test library standards for test data generation, value object contracts, and JUL log testing allowed-tools: [Read, Grep, Glob]

CUI Testing Skill

REFERENCE MODE: This skill provides reference material. Load specific standards on-demand based on current task.

CUI-specific testing standards for projects using CUI test libraries. This skill covers the mandatory test data generator framework, value object contract testing, and JUL log testing utilities.

Prerequisites

This skill requires CUI test library dependencies:

• de.cuioss.test:cui-test-generator (Generators, TypedGenerator)
• de.cuioss.test:cui-test-value-objects (ShouldHandleObjectContracts)
• de.cuioss.test:cui-test-juli (EnableTestLogger, LogAsserts)

Workflow

Step 1: Load Test Generator Framework

CRITICAL: Load this standard for any test implementation work.

CopyRead: standards/test-generator-framework.md

This provides the foundational rules:

• MANDATORY use of Generators.* for ALL test data
• FORBIDDEN: Manual test data, Random, Faker
• REQUIRED: @EnableGeneratorController annotation

Step 2: Load Additional Standards (As Needed)

Value Object Testing (load for domain object tests):

CopyRead: standards/testing-value-objects.md

Use when: Testing value objects, implementing equals/hashCode contracts, or using ShouldHandleObjectContracts<T>.

JUL Log Testing (load for log verification tests):

CopyRead: standards/testing-juli-logger.md

Use when: Testing code that uses CUI logging and needs to verify log output with @EnableTestLogger and LogAsserts.

Key Rules Summary

Test Data Generation

Copy// CORRECT - Use Generators
@EnableGeneratorController
class MyServiceTest {
    @Test
    void shouldProcess() {
        String input = Generators.nonEmptyStrings().next();
        // ...
    }
}

// FORBIDDEN - Never use manual data or Random
String input = "test"; // WRONG
String input = UUID.randomUUID().toString(); // WRONG

Parameterized Tests

Copy// CORRECT - Use @GeneratorsSource
@ParameterizedTest
@GeneratorsSource(EmailGenerator.class)
void shouldValidateEmail(String email) {
    // Test with generated emails
}

Value Object Contracts

Copy// Implements automatic contract testing
class PersonTest implements ShouldHandleObjectContracts<Person> {
    @Override
    public Person getUnderTest() {
        return new PersonGenerator().next();
    }
}

Log Testing

Copy@EnableTestLogger
class MyServiceTest {
    @Test
    void shouldLogWarning() {
        // Execute code that logs
        service.processWithWarning();

        // Verify log output
        LogAsserts.assertLogContains(TestLogLevel.WARN, "expected message");
    }
}

Related Skills

• pm-dev-java:junit-core - General JUnit 5 patterns (no CUI dependencies)
• pm-dev-java-cui:cui-logging - CUI logging standards (use with cui-testing for log tests)

Standards Reference