使用EasyMock模拟Hibernate的SessionFactory

Question

我正在尝试为以下类编写单元测试：

@Transactional
public class EditorHelper {

private static SessionFactory sf;

static {        
    ClassPathResource hbr = new ClassPathResource("hibernate.cfg.xml");
    File hbCfg = null;

    try {
        hbCfg = hbr.getFile();
    } catch (IOException e) {
        e.printStackTrace();
    }
    if (hbCfg != null) {
        sf = new AnnotationConfiguration().configure(hbCfg).buildSessionFactory(); // <-- Stack trace points here
    }
}
public static void setSf(SessionFactory sf) {
    EditorHelper.sf = sf;
}
}

还有一些其他方法，但这个设置代码是与我的问题相关的。在单元测试中，我想模拟（使用EasyMock）SessionFactory对象SF以及它将返回的Session和Transaction对象：

public class EditorTest {

    private SessionFactory sf;
    private Session s;
    private Transaction tx;
    private Long id = 1L;
    private String idStr = id.toString();

    @Before
    public void setUp() {

        sf = EasyMock.createMock(SessionFactory.class);
        s = EasyMock.createMock(Session.class);
        tx = EasyMock.createMock(Transaction.class);

        EditorHelper.setSf(sf); // <-- Stack trace points here

        EasyMock.expect(sf.getCurrentSession()).andReturn(s);
        EasyMock.expect(s.beginTransaction()).andReturn(tx);
    }
// Tests go here
}

当我尝试用JUnit运行它时，我得到以下错误：

java.lang.NoSuchFieldError: INSTANCE
    at org.hibernate.type.BasicTypeRegistry.<init>(BasicTypeRegistry.java:94)
    at org.hibernate.type.TypeResolver.<init>(TypeResolver.java:59)
    at org.hibernate.cfg.Configuration.<init>(Configuration.java:250)
    at org.hibernate.cfg.Configuration.<init>(Configuration.java:302)
    at org.hibernate.cfg.AnnotationConfiguration.<init>(AnnotationConfiguration.java:87)
    at com.mypkg.helper.EditorHelper.<clinit>(EditorHelper.java:38)
    at com.mypkg.model.EditorTest.setUp(EditorTest.java:29)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

在SF上没有我可以看到的公共instance变量。我是EasyMock的新手，所以我想我的问题是：对于instance我应该告诉我的mock返回什么，以及如何告诉它这样做？我根本不知道为什么sessionFactory设置代码会被setsf()调用，所以这是另一个谜。更普遍的问题是：我应该如何模拟一个SessionFactory对象？

我发现，不做任何事情就捕捉异常会很好地工作。我已将EditorHelper类更改如下：

@Transactional
public class EditorHelper {

private static SessionFactory sf;

static {    

...

    if (hbCfg != null) {
        try { // New try block lets the initializaiton fail
            sf = new AnnotationConfiguration().configure(hbCfg).buildSessionFactory();
        } catch (NoSuchFieldError e) {
            e.printStackTrace();
        }
    }
...

一旦这个静态块完成，我就可以将sessionFactory成员设置为指向我的mock对象，然后一切都可以从那里开始工作。

Answer 1

正在运行代码，因为它位于静态初始化块内。一旦您的测试引用EditorHelper，JVM将加载类，并且该初始化块将运行，并尝试从使用配置XML文件配置的AnnotationConfiguration实例创建SessionFactory。

你想考哪个班？我注意到测试是EditorTest，类是EditorHelper。这是有意的吗？您实际上是在测试editor类吗？