用EasyMock对模板方法进行部分模拟

Question

我有几个类遵循“模板方法”模式。抽象类A,具体扩展类B和C,如下所示：

public abstract class A
{
  protected abstract String getData() throws SomeException;

  public void doWork() throws OtherException
  {
    try
    {
      // business logic ...
      String data = this.getData();
      // more business logic ...
    }
    catch(SomeException e)
    {
      log("...", e);
      throw new OtherException("...", e);
    }
  }
}

public Class B extends A
{
  protected String getData() throws SomeException
  {
    // complicated logic relying on lots of dependencies
  }
}

public Class C extends A
{
  protected String getData() throws SomeException
  {
    // different but equally complicated logic relying on lots of dependencies
  }
}

我想编写一个测试来验证当getData（）抛出某个Exception时是否抛出其他Exception。我真的希望避免模拟强制getData（）抛出所需的所有复杂依赖关系。我不关心getData（）如何抛出，我只想让它抛出。所以我想我要的是部分模拟。这就是我所拥有的：

import static org.easymock.EasyMock.*;
....
@Test(expected = OtherException.class)
public void testSomethingOrAnother() throws Exception
{
    B target = createMockBuilder(B.class).addMockedMethod("getData").createMock();

    expect(target.getData()).andThrow(SomeException.class).once();

    replay(target)

    try
    {
        target.doWork(); // expect this to throw OtherException;
    }
    finally
    {
        verify(target);
    }
}

这个测试在我看来很好，但当我运行它时，我得到了这样的结果：

java.lang.Exception: Unexpected exception, expected<OtherException> but was<java.lang.RuntimeException>
    ... deleted for brevity ...
Caused by: java.lang.RuntimeException: Ambiguous name: More than one method are named getData
    at org.easymock.internal.ReflectionUtils.findMethod(ReflectionUtils.java:96)
    at org.easymock.internal.ReflectionUtils.findMethod(ReflectionUtils.java:64)
    at org.easymock.internal.MockBuilder.addMockedMethod(MockBuilder.java:73)
    at org.easymock.internal.MockBuilder.addMockedMethods(MockBuilder.java:92)
    at com.mycompany.more.packages.BTest(BTest.java:83)
    ... deleted for brevity ...
    ... 16 more

需要说明的是：层次结构中的任何地方都没有getData（）方法的重载。

EasyMock能做我想做的事吗？我错过了什么？

相关版本编号：

• EasyMock 3.0
• JUnit 4.4
• Java 1.6

Answer 1

我认为您的问题可能是addMockedMethod（String）的使用问题。不知道如果没有重载，为什么EasyMock会抱怨方法名称不明确。但以下几点对我起到了作用：

@Test
        public void testSomethingOrAnother() {
            B target = null;
            try {
                target = EasyMock.createMockBuilder(B.class).addMockedMethod(B.class.getDeclaredMethod("getData")).createMock();
                EasyMock.expect(target.getData()).andThrow(new SomeException());
                EasyMock.replay(target);
            } catch (NoSuchMethodException e) {
                fail(e.getMessage());
            } catch (SomeException e) {
                fail(e.getMessage());
            }

            try {
                target.doWork();
                fail("doWork should have thrown an exception");
            } catch (OtherException e) {
                //pass
            }
        }