Java 单元测试覆盖率数字不匹配

Question

下面是我在使用 Java Google App Engine 构建的 Web 应用程序中编写的一个类。我已经使用 TestNG 编写了单元测试并且所有测试都通过了。然后我在 Eclipse 中运行 EclEmma 以查看我的代码的测试覆盖率。所有函数都显示 100% 的覆盖率，但整个文件显示大约 27% 的覆盖率。 73% 的未发现代码来自哪里？

任何人都可以帮助我了解 EclEmma 的工作原理以及为什么我会遇到数字差异吗？

package com.skaxo.sports.models;

import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;

@PersistenceCapable(identityType= IdentityType.APPLICATION)
public class Account {

    @PrimaryKey
    @Persistent(valueStrategy=IdGeneratorStrategy.IDENTITY)
    private Long id;

    @Persistent
    private String userId;

    @Persistent
    private String firstName;

    @Persistent
    private String lastName;

    @Persistent
    private String email;

    @Persistent
    private boolean termsOfService;

    @Persistent
    private boolean systemEmails;

    public Account() {}

    public Account(String firstName, String lastName, String email) {
        super();
        this.firstName = firstName;
        this.lastName = lastName;
        this.email = email;
    }

    public Account(String userId) {
        super();
        this.userId = userId;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public Long getId() {
        return id;
    }

    public String getUserId() {
        return userId;
    }

    public void setUserId(String userId) {
        this.userId = userId;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public boolean acceptedTermsOfService() {
        return termsOfService;
    }

    public void setTermsOfService(boolean termsOfService) {
        this.termsOfService = termsOfService;
    }

    public boolean acceptedSystemEmails() {
        return systemEmails;
    }

    public void setSystemEmails(boolean systemEmails) {
        this.systemEmails = systemEmails;
    }
}

下面是上述类的测试代码。

package com.skaxo.sports.models;

import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertNotNull;
import static org.testng.Assert.assertTrue;
import static org.testng.Assert.assertFalse;

import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;

public class AccountTest {

    @Test
    public void testId() {
        Account a = new Account();
        a.setId(1L);
        assertEquals((Long) 1L, a.getId(), "ID");
        a.setId(3L);
        assertNotNull(a.getId(), "The ID is set to null.");
    }

    @Test
    public void testUserId() {
        Account a = new Account();
        a.setUserId("123456ABC");
        assertEquals(a.getUserId(), "123456ABC", "User ID incorrect.");
        a = new Account("123456ABC");
        assertEquals(a.getUserId(), "123456ABC", "User ID incorrect.");
    }

    @Test
    public void testFirstName() {
        Account a = new Account("Test", "User", "test@example.com");
        assertEquals(a.getFirstName(), "Test", 
                "User first name not equal to 'Test'.");
        a.setFirstName("John");
        assertEquals(a.getFirstName(), "John", 
                "User first name not equal to 'John'.");
    }

    @Test
    public void testLastName() {
        Account a = new Account("Test", "User", "test@example.com");
        assertEquals(a.getLastName(), "User",
                "User last name not equal to 'User'.");
        a.setLastName("Doe");
        assertEquals(a.getLastName(), "Doe", 
                "User last name not equal to 'Doe'.");
    }

    @Test
    public void testEmail() {
        Account a = new Account("Test", "User", "test@example.com");
        assertEquals(a.getEmail(), "test@example.com", 
                "User email not equal to 'test@example.com'.");
        a.setEmail("john@example.com");
        assertEquals(a.getEmail(), "john@example.com", 
                "User email not equal to 'john@example.com'.");
    }

    @Test
    public void testAcceptedTermsOfService() {
        Account a = new Account();
        a.setTermsOfService(true);
        assertTrue(a.acceptedTermsOfService(),
                "Accepted Terms of Service not true.");
        a.setTermsOfService(false);
        assertFalse(a.acceptedTermsOfService(),
                "Accepted Terms of Service not false.");
    }

    @Test
    public void testAcceptedSystemEmails() {
        Account a = new Account();
        a.setSystemEmails(true);
        assertTrue(a.acceptedSystemEmails(), "System Emails is not true.");
        a.setSystemEmails(false);
        assertFalse(a.acceptedSystemEmails(), "System Emails is not false.");
    }
}

Answer 1

这是一个猜测，但基于 PersistenceCapable 的 Javadoc看起来这个类是由 JDO 增强器编织的附加代码来实现接口(interface)。如果是这种情况，您的测试很可能没有涵盖附加代码。如果您删除注释并再次运行测试，您是否看到预期的覆盖率？

来自 Javadoc:

In the Reference Implementation, the JDO Enhancer modifies the class to implement PersistenceCapable prior to loading the class into the runtime environment. The Reference Enhancer also adds code to implement the methods defined by PersistenceCapable.

您也可以尝试使用反编译器，例如 JAD检查已编译的类以验证该类是否确实在编译时(或作为预处理)与其他方法编织在一起。再次来自 Javadoc:

The extra methods in the PersistenceCapable interface might be generated by pre-processing a .java file, or might be generated from a tool directly. The exact technique for generating the extra methods is not specified by JDO.