public final int size() {
        return this.size;
    }
@Test
    public void testSize() {
        this.list.add( this.node1 );
        assertThat(this.list.size()).as("LinkedList should have 1 node").isEqualTo(1);

        this.list.add( this.node2 );
        assertThat(this.list.size()).as("LinkedList should have 2 node").isEqualTo(2);

        this.list.add( this.node3 );
        assertThat(this.list.size()).as("LinkedList should have 3 node").isEqualTo(3);
    }