package com.atlassian.plugin.event.listeners;
   
   import static org.junit.Assert.fail;
   
   public class FailListener {
       private final Class<?> clazz;
   
       public FailListener(final Class<?> clazz) {
           this.clazz = clazz;
      }
  
      public void channel(final Object o) {
          if (clazz.isInstance(o)) {
              fail("Event thrown of type " + clazz.getName());
          }
      }
  }