@Test
public void testGetAttributeKeys() {

    GraphStore store = new GraphStore();
    Column column = generateBasicColumn(store);
    NodeImpl node = new NodeImpl("0", store);
    Set<String> pk = node.getAttributeKeys();
    Assert.assertTrue(pk.contains(column.getId()));
    Assert.assertEquals(pk.size(), 1 + getElementPropertiesLength());
}