Testing Strategy Enforcement Skill

Purpose

This skill enforces the CIA platform's testing strategy, ensuring consistent coverage thresholds, proper test pyramid adherence, and CI/CD gate enforcement. It provides actionable guidance for maintaining test quality across all modules.

When to Use This Skill

Apply this skill when:

• ✅ Writing tests for new features
• ✅ Reviewing PRs for test adequacy
• ✅ Configuring CI/CD test gates
• ✅ Investigating test failures or flaky tests
• ✅ Measuring and improving test coverage
• ✅ Deciding test scope for a change
• ✅ Refactoring existing test suites

Do NOT use for:

• ❌ Security-specific testing (use secure-code-review)
• ❌ Performance testing design (use performance analysis)
• ❌ UI/UX validation (use playwright-ui-testing)

Coverage Requirements

Mandatory Thresholds

JaCoCo Configuration

<plugin>
    <groupId>org.jacoco</groupId>
    <artifactId>jacoco-maven-plugin</artifactId>
    <executions>
        <execution>
            <id>check</id>
            <goals><goal>check</goal></goals>
            <configuration>
                <rules>
                    <rule>
                        <element>BUNDLE</element>
                        <limits>
                            <limit>
                                <counter>LINE</counter>
                                <value>COVEREDRATIO</value>
                                <minimum>0.80</minimum>
                            </limit>
                            <limit>
                                <counter>BRANCH</counter>
                                <value>COVEREDRATIO</value>
                                <minimum>0.70</minimum>
                            </limit>
                        </limits>
                    </rule>
                </rules>
            </configuration>
        </execution>
    </executions>
</plugin>

Test Pyramid

        ╱╲
       ╱  ╲        E2E Tests (Playwright/Selenium)
      ╱ 5% ╲       - Critical user workflows only
     ╱──────╲      - Login, navigation, key features
    ╱        ╲
   ╱  15-20%  ╲    Integration Tests (Spring Test + TestContainers)
  ╱            ╲   - Service layer, repository layer
 ╱──────────────╲  - External API integration
╱                ╲
╱    75-80%       ╲ Unit Tests (JUnit 5 + Mockito)
╱──────────────────╲- Business logic, utilities, models

Unit Tests (75-80% of total tests)

Framework: JUnit 5 + Mockito + AssertJ

What to Test:

• Business logic in service classes
• Data transformation and mapping
• Validation logic
• Utility methods
• Exception handling paths
• Edge cases and boundary conditions

Patterns:

@ExtendWith(MockitoExtension.class)
class PoliticianServiceTest {

    @Mock
    private PoliticianRepository repository;

    @InjectMocks
    private PoliticianServiceImpl service;

    @Test
    void shouldReturnPoliticianWhenFound() {
        // Given
        var politician = createTestPolitician();
        when(repository.findById("id-1")).thenReturn(Optional.of(politician));

        // When
        var result = service.findById("id-1");

        // Then
        assertThat(result).isPresent();
        assertThat(result.get().getName()).isEqualTo("Test Name");
        verify(repository).findById("id-1");
    }

    @Test
    void shouldThrowWhenPoliticianNotFound() {
        when(repository.findById(anyString())).thenReturn(Optional.empty());

        assertThatThrownBy(() -> service.getById("invalid"))
            .isInstanceOf(EntityNotFoundException.class);
    }
}

Integration Tests (15-20% of total tests)

Framework: Spring Test + TestContainers

What to Test:

• Database repository operations
• Spring Security filter chains
• Service layer with real dependencies
• External API client integration
• Transaction boundaries

Patterns:

@SpringBootTest
@ActiveProfiles("test")
class PoliticianRepositoryIntegrationTest {

    @Autowired
    private PoliticianRepository repository;

    @Test
    void shouldPersistAndRetrievePolitician() {
        var politician = createTestPolitician();
        repository.save(politician);

        var found = repository.findById(politician.getId());
        assertThat(found).isPresent();
    }
}

E2E Tests (5% of total tests)

Framework: Playwright

What to Test:

• Critical user workflows (login, navigation)
• Key data visualization pages
• Admin operations
• Cross-browser compatibility

CI Gate Enforcement

Required CI Gates

Gate Failure Response

CI Gate Failed
    │
    ├─→ Test Failure?
    │   ├─→ Is it a flaky test? → Fix flaky test, don't skip
    │   ├─→ Is it a real regression? → Fix the code
    │   └─→ Is the test outdated? → Update the test
    │
    ├─→ Coverage Below Threshold?
    │   ├─→ New code not tested? → Add tests for new code
    │   ├─→ Existing coverage dropped? → Add missing tests
    │   └─→ Threshold too aggressive? → Document exception
    │
    ├─→ Quality Gate Failed?
    │   ├─→ Critical issue? → Fix immediately
    │   ├─→ False positive? → Document suppression
    │   └─→ Technical debt? → Create backlog item
    │
    └─→ Security Scan Failed?
        ├─→ Real vulnerability? → Fix before merge
        └─→ False positive? → Add suppression with justification

Test Quality Guidelines

Test Naming Convention

methodUnderTest_condition_expectedResult

Example: findById_whenPoliticianExists_returnsPolitician

Test Anti-Patterns to Avoid

Coverage Exceptions

Coverage exceptions are permitted only when:

1. Code is auto-generated (JPA metamodel, JAXB)
2. Code is boilerplate (getters/setters on simple DTOs)
3. Infrastructure code with no business logic

Exception Process:

<!-- JaCoCo exclusion in pom.xml -->
<configuration>
    <excludes>
        <exclude>**/model/*_.class</exclude>    <!-- JPA metamodel -->
        <exclude>**/generated/**</exclude>       <!-- Generated code -->
    </excludes>
</configuration>

Measuring Test Effectiveness

Reports and Dashboards

# Generate coverage report
mvn clean test jacoco:report

# View report
open target/site/jacoco/index.html

# Generate aggregate report for multi-module
mvn clean verify -pl . -am

Coverage Trend Monitoring

• SonarCloud tracks coverage trends over time
• Coverage must not decrease on any PR
• Target steady improvement toward 85%+ line coverage

ISMS Alignment

References

• JUnit 5 User Guide
• Mockito Documentation
• JaCoCo Documentation
• CIA UnitTestPlan.md