001    package org.picocontainer;
002    
003    import junit.framework.TestCase;
004    
005    public class CharacteristicsTestCase extends TestCase {
006    
007        public void testCharacteristicsAreImmutable() {
008            String b4 = Characteristics.CDI.toString();
009            try {
010                Characteristics.CDI.remove("injection");
011                fail();
012            } catch (UnsupportedOperationException e) {
013                // expected
014            }
015        }
016    
017    }