001    package org.picocontainer;
002    
003    import static org.junit.Assert.assertNotNull;
004    
005    import org.junit.Test;
006    
007    public class CharacteristicsTestCase  {
008    
009        @Test(expected=UnsupportedOperationException.class)    
010        public void testCharacteristicsAreImmutable() {
011            assertNotNull(Characteristics.CDI.toString());
012            Characteristics.CDI.remove("injection");
013        }
014    
015    }