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Here is a sample test using EasyMock Plugin:

import com.mycila.testing.core.TestSetup;
import static org.easymock.classextension.EasyMock.*;
import static org.testng.Assert.*;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;

public final class Usage1 extends MycilaTestNGTest {

    @Mock
    Service standardMock;

    @Mock(Mock.TYPE.NICE)
    Service niceMock;

    @Mock(Mock.TYPE.STRICT)
    Service strictMock;

    @Test
    public void test_mock_standard() {
        expect(service1.go()).andReturn("Hello World !");
        replay(service1);
        assertEquals(service1.go(), "Hello World !");
        verify(service1);
    }
}

@Mock defines a mock to be created and injected. The mock can be an interface or a class. You can also give as a parameter the type of mock to create. By default, a standard mock is created. You can also create nice mocks and strict mocks as you need. Please read EasyMock documentation to have more details about when nice and strict modes can be used.