java - Jacoco 未检测到接口(interface)

Question

我已经配置了 Jacoco，以便它在单元测试运行时生成覆盖率报告。

<plugin>
            <groupId>org.jacoco</groupId>
            <artifactId>jacoco-maven-plugin</artifactId>
            <version>0.8.2</version>
            <executions>
                <execution>
                    <id>unit-test-prepare-agent</id>
                    <goals>
                        <goal>prepare-agent</goal>
                    </goals>
                    <configuration>
                        <propertyName>surefireArgLine</propertyName>
                        <destFile>${jacoco.report.directory}/jacoco-ut.exec</destFile>
                    </configuration>
                </execution>
                <execution>
                    <id>unit-test-report</id>
                    <phase>test</phase>
                    <goals>
                        <goal>report</goal>
                    </goals>
                    <configuration>
                        <dataFile>${jacoco.report.directory}/jacoco-ut.exec</dataFile>
                        <outputDirectory>${jacoco.report.directory}/jacoco-ut</outputDirectory>
                    </configuration>
                </execution>
    </executions>
</plugin>

但由于某种原因，它跳过了项目的 dao 包，其中包含 Spring Data Jpa 存储库接口(interface)。

例如以下界面:

import com.shaunyl.website.dao;

public interface ProductRepository extends JpaRepository<Product, Long>, JpaSpecificationExecutor<Product> {

    @Query(value = "SELECT p FROM Product p",
            countQuery = "SELECT COUNT(p) FROM Product p")
    Page<Product> findAll(Pageable pageable);
}

有以下测试:

@RunWith(SpringRunner.class)
@DataJpaTest
public class ProductRepositoryTests {

    private static final int INVENTORY_SIZE = 5;

    @Autowired
    ProductRepository productRepository;

    private Category[] categories;

    private List<Product> inventory;

    @Before
    public void setUp() {
        inventory = productRepository.saveAll(products(INVENTORY_SIZE));
        categories = inventory.stream().map(Product::getCategory).toArray(Category[]::new);
    }

@Test
public void shouldRetrieveOnePageOfProducts() {
    // given
    int PAGE = 0;
    int SIZE = 20;
    Pageable pageable = newUnsortedPage(PAGE, SIZE);

    // when
    Page<Product> products = productRepository.findAll(pageable);

    // then
    assertThat(products.getNumber()).isEqualTo(PAGE);
    assertThat(products.getNumberOfElements()).isEqualTo(INVENTORY_SIZE);
    assertThat(products)
            .as("categories are eagerly fetched")
            .extracting(Product::getCategory)
            .containsExactlyInAnyOrder(categories);
 }
}

但是在Jacoco报告中，dao包被跳过了。我相信这是因为目标类是一个接口(interface)，但我不确定。

您知道可能出现什么问题以及如何解决它吗？

Answer 1

JaCoCo 测量可执行Java 代码。在你的界面中

public interface ProductRepository extends JpaRepository<Product, Long>, JpaSpecificationExecutor<Product> {

    @Query(value = "SELECT p FROM Product p",
            countQuery = "SELECT COUNT(p) FROM Product p")
    Page<Product> findAll(Pageable pageable);
}

没有可执行的Java代码，只有使用常量的方法声明和注释。

JaCoCo FAQ 中也对此进行了解释:

Why are abstract methods not shown in coverage reports?

Abstract methods do not contain code, therefore code coverage cannot be evaluated. Indeed code coverage is recorded for subclasses implementing these methods. The same applies to non-default methods in interfaces.