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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *   http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   *
17   */
18  
19  package org.apache.commons.net.imap;
20  
21  import org.junit.Assert;
22  
23  import org.junit.Test;
24  
25  
26  public class IMAPTest {
27  
28      @Test
29      public void checkGenerator() {
30          // This test assumes:
31          // - 26 letters in the generator alphabet
32          // - the generator uses a fixed size tag
33          IMAP imap = new IMAP();
34          String initial = imap.generateCommandID();
35          int expected = 1;
36          for(int j=0; j < initial.length(); j++) {
37              expected *= 26; // letters in alphabet
38          }
39          int i=0;
40          boolean matched=false;
41          while(i <= expected+10) { // don't loop forever, but allow it to pass go!
42              i++;
43              String s = imap.generateCommandID();
44              matched = initial.equals(s);
45              if (matched) { // we've wrapped around completely
46                  break;
47              }
48          }
49          Assert.assertEquals(expected, i);
50          Assert.assertTrue("Expected to see the original value again", matched);
51      }
52  }