@Test(timeout=1000)
public void testFindContainingJar() {

  String containingJar = ClassUtil.findContainingJar(Logger.class);
  Assert.assertNotNull("Containing jar not found for Logger", 
      containingJar);
  File jarFile = new File(containingJar);
  Assert.assertTrue("Containing jar does not exist on file system", 
      jarFile.exists());
  Assert.assertTrue("Incorrect jar file" + containingJar,  
      jarFile.getName().matches("log4j.+[.]jar"));
}