TIntList a = new TIntArrayList();
for ( int i = 1; i <= element_count; i++ ) {
a.add( i );
}
a.reverse( 1, 19 );
int[] expected = {1, 19, 18, 17, 16, 15, 14, 13, 12, 11,
10, 9, 8, 7, 6, 5, 4, 3, 2, 20};
for ( int i = 0; i < a.size(); i++ ) {
assertEquals( expected[i], a.get( i ) );