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<p><a href="http://rmock.sourceforge.net/">RMock</a> is a Java mock object framework typically used with JUnit 3.x. RMock has support for a setup-modify-run-verify workflow when writing JUnit tests. It integrates better with IDE refactoring support than some other popular mocking frameworks and allows designing classes and interfaces in a true test-first fashion.</p>

<p>The sections below illustrate using RMock 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 RMock 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>
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// require(groupId:'com.agical.rmock', artifactId:'rmock', version='2.0.2')
// require(groupId:'junit', artifactId:'junit', version='3.8.2')
// require(groupId:'cglib', artifactId:'cglib-nodep', version='2.2_beta1')
import com.agical.rmock.extension.junit.RMockTestCase

class RmockTest extends RMockTestCase {
    def mockReverser, storer

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

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

def expectReverse(input, output) {
        mockReverser.reverse(input)
        modify().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(RmockTest.class)
junit.textui.TestRunner.run(suite)
</pre></td></tr></table>