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POCan a JMock mock object return another mock object?
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  1. POCan a JMock mock object return another mock object?
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    copied!<p>I'm writing tests for an application using the iBatis DAO framework. The app is running in a java 1.4 environment, so I'm using legacy versions of everything (JDK 1.4, JUnit3, iBatis 2.3 and JMock 1.2). </p> <p>In my <code>MockObjectTestCase</code> subclass I have this test</p> <pre><code>public void testInsert() throws Exception { Mock mockDao = mock(TblPpvFiltersDao.class); mockDao.expects(once()).method("insert"); Mock mockDaoManager = mock(DaoManager.class); mockDaoManager.expects(once()).method("getDao") .with(eq(TblPpvFiltersDao.class)) .will(returnValue((TblPpvFiltersDao) mockDao.proxy())); PpvFiltersService service = new PpvFiltersServiceImpl( (DaoManager) mockDaoManager.proxy()); service.insert(new PpvFiltersVO()); } </code></pre> <p>which should verify that the service object will ask the <code>DaoManager</code> for a DAO object and call the <code>insert</code> method on it. The test fails with the error message</p> <pre><code>...DynamicMockError: mockDaoManager: tried to return an incompatible value: expected a com.ibatis.dao.client.Dao but returned a $Proxy0 </code></pre> <p>Trying to cast the <code>mockDao</code> object either to either <code>com.ibatis.dao.client.Dao</code> or <code>com.ibatis.dao.client.template.SqlMapDaoTemplate</code> ends in a <code>ClassCastException</code>.</p> <p>What am I missing?</p> <p><strong>Update:</strong> nothing changes converting the code to use JDK 1.6, JUnit 4 and JMock2. This code</p> <pre><code>@Test public void testInsert() throws Exception { final PpvFiltersVO theFilter = new PpvFiltersVO(new Integer(42)); final TblPpvFiltersDao mockDao = context.mock(TblPpvFiltersDao.class); final DaoManager mockDaoManager = context.mock(DaoManager.class); context.checking(new Expectations() {{ oneOf (mockDaoManager).getDao(TblPpvFiltersDao.class); will(returnValue(mockDao)); oneOf (mockDao).insert(theFilter); }}); PpvFiltersService service = new PpvFiltersServiceImpl(mockDaoManager); service.insert(theFilter); } </code></pre> <p>results in this error message:</p> <pre><code>java.lang.IllegalStateException: tried to return a $Proxy6 from a method that can only return a com.ibatis.dao.client.Dao </code></pre> <p>maybe I'm missing something obvious here, but the code above comes almost straight from the JMock examples at <a href="http://www.jmock.org/getting-started.html" rel="nofollow noreferrer">http://www.jmock.org/getting-started.html</a>.</p> <p>Any ideas?</p> <p><strong>Fixed</strong> Of course it was something obvious. <code>TblPpvFiltersDao</code> above needs to extend the <code>com.ibatis.dao.client.Dao</code> marker interface. D'oh.</p>
 

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