public class TrackableMethodExample 
{
    private List<String> coll = Arrays.asList("s1", "s2", "s3", "", null);
    private Map<String, String> aMap = new HashMap<String, String>();
    private int [] aInts = { 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, -1, -2, -3, -4, -5 };
    private Integer [] aBigInts = { 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, -1, -2, -3, -4, -5 };
    private String [] aStrings = { "a", "b", null, "d", "a long string, just long enough to be slightly shortened"};
    private State [] aStates = null;
    protected int id = 0;
    protected String label = null;
    private ResultStatus lastChangeStatus = null;
    private ResultStatus lastChangeStatusDupe = null;
    En enumField = En.E1;

    public TrackableMethodExample(State initialState) 
    {
        aStates = new State [] { initialState };
        aMap.put("foo", "bar");
    }

    public int getId(){/*an odd getter*/return/*an odd getter*/ id/*an odd getter*/;/*an odd getter*/}

    public String getLabel() 
    {
        return label;
    }

    public ResultStatus changeState(State newState)
    {
        aStates = new State [] { aStates[0],  newState };
        aMap.put("hello", "world");
        id = newState.newId;
        label = newState.newLabel;
        lastChangeStatus = new ResultStatus();
        enumField = En.E2;
        return lastChangeStatus;
    }

    public <E> List<E> genericList(List<E> aGenericList) {
        return aGenericList;
    }
    public static final class State
    {
        public final String newLabel;
        public final int newId;

        public State(String newLabel, int newId) 
        {
            this.newLabel = newLabel;
            this.newId = newId;
        }
    }

    public static final class ResultStatus
    {
        Object o1 = null;
        Object o2 = new Object();
    }

    public enum En { E1, E2 }
}


public class TrackableMethodExampleTest
{
    @Test
    public void testChangeState() throws Exception
    {
        State initialState = new State("state", 2);
        // Given
        TrackableMethodExample underTest = new TrackableMethodExample(initialState);

        // When
        State newState = new State("state changed", 10);
        ResultStatus result = underTest.changeState(newState);

        Assert.assertNotNull(result);
    }
}