package com.atlassian.plugin.classloader;
   
   import junit.framework.TestCase;
   
   /**
    * Unit Tests for the {@link DelegationClassLoader}.
    */
   public class TestDelegationClassLoader extends TestCase {
   
      public void testLoadSystemClassWithOutDelegateSet() throws ClassNotFoundException {
          DelegationClassLoader classLoader = new DelegationClassLoader();
          Class c = classLoader.loadClass("java.lang.String");
          assertNotNull(c);
      }
  
      public void testLoadSystemClassWithDelegateSet() throws ClassNotFoundException {
          ClassLoader parentClassLoader = TestDelegationClassLoader.class.getClassLoader();
          DelegationClassLoader classLoader = new DelegationClassLoader();
          classLoader.setDelegateClassLoader(parentClassLoader);
          Class c = classLoader.loadClass("java.lang.String");
          assertNotNull(c);
      }
  
      public void testCantLoadUnknownClassWithOutDelegateSet() {
          DelegationClassLoader classLoader = new DelegationClassLoader();
          try {
              classLoader.loadClass("not.a.real.class.path.NotARealClass");
              fail("ClassNotFoundException expected");
          } catch (ClassNotFoundException e) {
              // expected case
          }
      }
  
      public void testCantLoadUnknownClassWithDelegateSet() {
          ClassLoader parentClassLoader = TestDelegationClassLoader.class.getClassLoader();
          DelegationClassLoader classLoader = new DelegationClassLoader();
          classLoader.setDelegateClassLoader(parentClassLoader);
          try {
              classLoader.loadClass("not.a.real.class.path.NotARealClass");
              fail("ClassNotFoundException expected");
          } catch (ClassNotFoundException e) {
              // expected case
          }
      }
  
      public void testCantSetNullDelegate() {
          DelegationClassLoader dcl = new DelegationClassLoader();
          try {
              dcl.setDelegateClassLoader(null);
              fail("expected IllegalArgumentException with null delegate");
          } catch (NullPointerException e) {
              // expected
          }
      }
  
      public void testCanSetDelegate() {
          DelegationClassLoader dcl = new DelegationClassLoader();
          dcl.setDelegateClassLoader(getClass().getClassLoader());
      }
  
  }