Using JMock with Groovy

// require(groupId:'junit', artifactId:'junit4', version='4.3.1')
// require(groupId:'org.jmock', artifactId:'jmock', version='2.01.0')
// require(groupId:'org.jmock', artifactId:'jmock-junit4', version='2.01.0')
import org.jmock.integration.junit4.JMock
import org.jmock.Mockery
import org.junit.Test
import org.junit.Before
import org.junit.runner.RunWith
import org.junit.runner.JUnitCore

@RunWith(JMock)
class JMock2Test {
    Mockery context = new JUnit4GroovyMockery()
    def mockReverser, storer

    @Before void setUp() throws Exception {
        mockReverser = context.mock(Reverser.class)
        storer = new JavaStorer(mockReverser)
    }

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

    def expectReverse(input, output) {
        context.checking{
            one(mockReverser).reverse(input); will(returnValue(output))
        }
    }

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

JUnitCore.main('JMock2Test')