package com.atlassian.plugin.classloader;
   
   import org.junit.Test;
   
   import static org.junit.Assert.assertNotNull;
   
   /**
    * Unit Tests for the {@link DelegationClassLoader}.
    */
  public class TestDelegationClassLoader {
  
      @Test
      public void testLoadSystemClassWithOutDelegateSet() throws ClassNotFoundException {
          DelegationClassLoader classLoader = new DelegationClassLoader();
          Class c = classLoader.loadClass("java.lang.String");
          assertNotNull(c);
      }
  
      @Test
      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);
      }
  
      @Test(expected = ClassNotFoundException.class)
      public void testCantLoadUnknownClassWithOutDelegateSet() throws ClassNotFoundException {
          DelegationClassLoader classLoader = new DelegationClassLoader();
          classLoader.loadClass("not.a.real.class.path.NotARealClass");
      }
  
      @Test(expected = ClassNotFoundException.class)
      public void testCantLoadUnknownClassWithDelegateSet() throws ClassNotFoundException {
          ClassLoader parentClassLoader = TestDelegationClassLoader.class.getClassLoader();
          DelegationClassLoader classLoader = new DelegationClassLoader();
          classLoader.setDelegateClassLoader(parentClassLoader);
          classLoader.loadClass("not.a.real.class.path.NotARealClass");
      }
  
      @Test(expected = NullPointerException.class)
      public void testCantSetNullDelegate() {
          DelegationClassLoader dcl = new DelegationClassLoader();
          dcl.setDelegateClassLoader(null);
      }
  
      @Test
      public void testCanSetDelegate() {
          DelegationClassLoader dcl = new DelegationClassLoader();
          dcl.setDelegateClassLoader(getClass().getClassLoader());
      }
  }