@Test
 public void testUGIAuthMethodInRealUser() throws Exception {
   final UserGroupInformation ugi = UserGroupInformation.getCurrentUser();
   UserGroupInformation proxyUgi = UserGroupInformation.createProxyUser("proxy", ugi);
   final AuthenticationMethod am = AuthenticationMethod.KERBEROS;
   ugi.setAuthenticationMethod(am);
   Assert.assertEquals(am, ugi.getAuthenticationMethod());
   Assert.assertEquals(AuthenticationMethod.PROXY, proxyUgi.getAuthenticationMethod());
   proxyUgi.doAs(
       new PrivilegedExceptionAction<Object>() {
         public Object run() throws IOException {
           Assert.assertEquals(
               AuthenticationMethod.PROXY,
               UserGroupInformation.getCurrentUser().getAuthenticationMethod());
           Assert.assertEquals(
               am, UserGroupInformation.getCurrentUser().getRealUser().getAuthenticationMethod());
           return null;
         }
       });
   UserGroupInformation proxyUgi2 = new UserGroupInformation(proxyUgi.getSubject());
   proxyUgi2.setAuthenticationMethod(AuthenticationMethod.PROXY);
   Assert.assertEquals(proxyUgi, proxyUgi2);
   // Equality should work if authMethod is null
   UserGroupInformation realugi = UserGroupInformation.getCurrentUser();
   UserGroupInformation proxyUgi3 = UserGroupInformation.createProxyUser("proxyAnother", realugi);
   UserGroupInformation proxyUgi4 = new UserGroupInformation(proxyUgi3.getSubject());
   Assert.assertEquals(proxyUgi3, proxyUgi4);
 }
 @Test
 public void testUGIAuthMethod() throws Exception {
   final UserGroupInformation ugi = UserGroupInformation.getCurrentUser();
   final AuthenticationMethod am = AuthenticationMethod.KERBEROS;
   ugi.setAuthenticationMethod(am);
   Assert.assertEquals(am, ugi.getAuthenticationMethod());
   ugi.doAs(
       new PrivilegedExceptionAction<Object>() {
         public Object run() throws IOException {
           Assert.assertEquals(
               am, UserGroupInformation.getCurrentUser().getAuthenticationMethod());
           return null;
         }
       });
 }