list.addLast("3");
        SLinkedList<String>.Entry e = list.getFirstEntry();
        assertThat(e.getPrevious(), is(nullValue()));
        assertThat(e.getNext().getElement(), is("2"));
        e = list.getLastEntry();
        assertThat(e.getNext(), is(nullValue()));
        assertThat(e.getPrevious().getElement(), is("2"));
        list.getEntry(1).remove();
        assertThat(list.getFirst(), is("1"));

            }
            return null;
        }

        /**
         * Returns the previous entry.
         *
         * @return the previous entry
         */
        public Entry getPrevious() {
            if (previous != SLinkedList.this.header) {
                return previous;
            }
            return null;
        }

        /**
         * Removes the element.
         */