### Question:
IndexEntry { public void copy( IndexEntry<K, I> entry ) { this.entry = entry.getEntry(); tuple.setKey( entry.getKey() ); tuple.setValue( entry.getId() ); } IndexEntry(); void setTuple( Tuple<K, I> tuple ); I getId(); K getKey(); void setId( I id ); void setKey( K value ); Entry getEntry(); void setEntry( Entry entry ); Tuple<K, I> getTuple(); void clear(); void copy( IndexEntry<K, I> entry ); int hashCode(); boolean equals( Object that ); String toString();  }### Answer:
@Test public void testCopy() { indexEntry.setTuple( new Tuple<String, Long>( "a", 1L ) ); IndexEntry<String, Long> indexEntry2 = new IndexEntry<String, Long>(); assertNull( indexEntry2.getId() ); assertNull( indexEntry2.getKey() ); assertNull( indexEntry2.getEntry() ); assertNotNull( indexEntry2.getTuple() ); assertNull( indexEntry2.getTuple().getKey() ); assertNull( indexEntry2.getTuple().getKey() ); indexEntry2.copy( indexEntry ); assertEquals( Long.valueOf( 1L ), indexEntry2.getId() ); assertEquals( "a", indexEntry2.getKey() ); assertEquals( new Tuple<String, Long>( "a", 1L ), indexEntry2.getTuple() ); }