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POPartial mock of template methods with EasyMock
 

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  1. POPartial mock of template methods with EasyMock
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    <p> I have a couple of classes following the "Template Method" pattern. Abstract class A, and concrete extensions, B and C. Like this:</p> <pre class="lang-java prettyprint-override"><code>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 } } </code></pre> <p>I want to write a test to verify when getData() throws SomeException that OtherException is thrown. I really want to avoid mocking up all of the complicated dependencies that would be required to force getData() to throw. I don't care how getData() throws, I just want it to throw. So I think a partial mock is what I want. This is what I have:</p> <pre class="lang-java prettyprint-override"><code>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); } } </code></pre> <p>The test looks good to me, but when I run it I get this:</p> <pre class="lang-java prettyprint-override"><code>java.lang.Exception: Unexpected exception, expected&lt;OtherException&gt; but was&lt;java.lang.RuntimeException&gt; ... 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 </code></pre> <p>To be clear: There is NOT an overload of the getData() method anywhere in the hierarchy.</p> <p>Is EasyMock able to do what I'm trying to do here? What am I missing?</p> <p>relevant versions numbers:</p> <ul> <li>EasyMock 3.0</li> <li>JUnit 4.4</li> <li>Java 1.6</li> </ul>
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