@Test
public void testSubString()
{

    assertEquals( "abcdefghij", subString( STRING, 0, 10 ) );
    assertEquals( "cdef", subString( STRING, 2, 4 ) );
    assertEquals( "ghij", subString( STRING, 6, 4 ) );
    assertEquals( "ghij", subString( STRING, 6, 6 ) );
    assertEquals( "", subString( STRING, 11, 3 ) );
    assertEquals( "j", subString( STRING, 9, 1 ) );
    assertEquals( "", subString( STRING, 4, 0 ) );
}