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<p><a href="http://jdummy.sourceforge.net/">JDummy</a> is a thin API which sits above JMock. It allows very succinct expectation setting code when the expectation code would normally involve many stubs.</p>

<p>The sections below illustrate using JDummy for the mocking parts of <a class="confluence-link" href="/display/GROOVY/Using+Testing+Frameworks+with+Groovy" data-linked-resource-id="67695" data-linked-resource-type="page" data-linked-resource-default-alias="Using Testing Frameworks with Groovy" data-base-url="http://docs.codehaus.org">Using Testing Frameworks with Groovy</a>.</p>

<h2>The Item Storer Example</h2>

<p>We are going to consider how you might use JDummy as part of testing the <a class="confluence-link" href="/display/GROOVY/Using+Testing+Frameworks+with+Groovy#UsingTestingFrameworkswithGroovy-AnItemStorerExample" data-anchor="AnItemStorerExample" data-linked-resource-id="67695" data-linked-resource-type="page" data-linked-resource-default-alias="Using Testing Frameworks with Groovy#AnItemStorerExample" data-base-url="http://docs.codehaus.org">Item Storer Example</a>.</p>

<p>Here is how we can test <code>JavaStorer</code>:</p>

<table class="wysiwyg-macro" data-macro-name="code" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e2NvZGV9&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>
// require(groupId:'jmock', artifactId:'jmock', version='1.2.0')
// require(groupId:'jmock', artifactId:'jmock-cglib', version='1.2.0')
// require(groupId:'junit', artifactId:'junit', version='3.8.2')
// require(groupId:'cglib', artifactId:'cglib-nodep', version='2.2_beta1')
// require(url:'jdummy.sf.net', jar:'jdummy-1.3.3.jar')
import net.sf.jdummy.JDummyTestCase

class JDummyTest extends JDummyTestCase {
    def mockReverser, storer

protected void setUp() throws Exception {
        mockReverser = mimicWithDummyValues(Reverser.class)
        storer = new JavaStorer(mockReverser)
    }

void testStorage() {
        expectReverse(123.456, -123.456)
        expectReverse('hello', 'olleh')
        checkReverse(123.456, -123.456)
        checkReverse('hello', 'olleh')
    }

def expectReverse(input, output) {
        // with is a keyword in Groovy so we quote it
        assertBehavior(mockReverser).expects(once()).method('reverse').'with'(eq(input)).will(returnValue(output))
    }

def checkReverse(value, reverseValue) {
        storer.put(value)
        assert value == storer.get()
        assert reverseValue == storer.getReverse()
    }
}

def suite = new junit.framework.TestSuite()
suite.addTestSuite(JDummyTest.class)
junit.textui.TestRunner.run(suite)
</pre></td></tr></table>

<p>Note: Our example is so simple, that JDummy's power is not really illustrated here.</p>