{
CharComparator comparator = new CharComparator();
assertEquals( 0, comparator.compare( null, null ) );
assertEquals( 0, comparator.compare( 'a', 'a' ) );
assertEquals( 0, comparator.compare( '\u00e9', '\u00e9' ) );
assertEquals( 1, comparator.compare( 'a', null ) );
assertEquals( -1, comparator.compare( 'A', 'a' ) );
assertEquals( 1, comparator.compare( 'a', 'A' ) );
assertEquals( -1, comparator.compare( null, 'a' ) );
assertEquals( -1, comparator.compare( 'a', 'b' ) );