Testing Strategy Enforcement

<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>

        ╱╲
       ╱  ╲        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

@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);
    }
}

@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();
    }
}