### Question:
EdgeTypeStore { public Object[] getLabels() { return labelMap.keySet().toArray(); } EdgeTypeStore();  EdgeTypeStore(Configuration config); int getId(final Object label); Object getLabel(final int id); int addType(final Object label); boolean addType(final Object label, final int id); int removeType(final Object label); Object removeType(final int type); Object[] getLabels(); int[] getIdsAsInts(); boolean contains(final Object label); boolean contains(final int id); void clear(); int size(); int deepHashCode(); boolean deepEquals(Object obj); final static int MAX_SIZE; }### Answer:
@Test public void testGetLabels() { EdgeTypeStore edgeTypeStore = new EdgeTypeStore(); edgeTypeStore.addType("0"); Assert.assertEquals(edgeTypeStore.getLabels(), new Object[] { null, "0" }); }