All the setup required for a simple JMock test

IterableCodecTest.java

public class IterableCodecTest {

    //CHECKSTYLE:OFF
    @Rule
    public final JUnitRuleMockery context = new JUnitRuleMockery();
    //CHECKSTYLE:ON
    // Mocks
    private BSONWriter bsonWriter;
    // Under test
    private final IterableCodec iterableCodec = new IterableCodec(Codecs.createDefault());

    @Before
    public void setUp() {
        context.setImposteriser(ClassImposteriser.INSTANCE);
        context.setThreadingPolicy(new Synchroniser());
        bsonWriter = context.mock(BSONWriter.class);
    }

    @Test
    public void shouldEncodeListOfStrings() {
        final List<String> stringList = asList("Uno", "Dos", "Tres");

        context.checking(new Expectations() {{
            oneOf(bsonWriter).writeStartArray();
            oneOf(bsonWriter).writeString("Uno");
            oneOf(bsonWriter).writeString("Dos");
            oneOf(bsonWriter).writeString("Tres");
            oneOf(bsonWriter).writeEndArray();
        }});

        iterableCodec.encode(bsonWriter, stringList);
    }
}