package com.atlassian.core.util;
   
   import junit.framework.TestCase;
   import org.junit.Test;
   
   import javax.imageio.ImageIO;
   import java.io.IOException;
   import java.io.InputStream;
   
  public class TestReusableBufferedInputStream extends TestCase
  {
      public void testReusableInputStreamIsReusable() throws Exception
      {
          InputStream inputStream = this.getClass().getResourceAsStream("/image.gif");
          InputStream reusableInputStream = new ReusableBufferedInputStream(inputStream);
  
          ImageIO.read(reusableInputStream);
          assertTrue("Expect end of the input stream after reading from it", reusableInputStream.available() == 0);
  
          reusableInputStream.close();
          assertTrue("Expect to be at the start of the reusable input stream after calling close()", reusableInputStream.available() > 0);
      }
  
      @Test(expected = IOException.class)
      public void testReusableInputStreamIsClosable() throws Exception
      {
          InputStream inputStream = this.getClass().getResourceAsStream("/image.gif");
          ReusableBufferedInputStream reusableInputStream = new ReusableBufferedInputStream(inputStream);
  
          reusableInputStream.destroy();
          ImageIO.read(reusableInputStream);
      }
  }