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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  package org.apache.commons.configuration.interpol;
18  
19  import static org.junit.Assert.assertEquals;
20  import static org.junit.Assert.assertNull;
21  
22  import java.util.Iterator;
23  
24  import org.apache.commons.configuration.EnvironmentConfiguration;
25  import org.junit.Before;
26  import org.junit.Test;
27  
28  /**
29   * Test class for EnvironmentLookup.
30   *
31   * @author <a
32   *         href="http://commons.apache.org/configuration/team-list.html">Commons
33   *         Configuration team</a>
34   * @version $Id: TestEnvironmentLookup.java 1225658 2011-12-29 21:11:03Z oheger $
35   */
36  public class TestEnvironmentLookup
37  {
38      /** The lookup to be tested. */
39      private EnvironmentLookup lookup;
40  
41      @Before
42      public void setUp() throws Exception
43      {
44          lookup = new EnvironmentLookup();
45      }
46  
47      /**
48       * Tests whether environment variables can be queried.
49       */
50      @Test
51      public void testLookup()
52      {
53          EnvironmentConfiguration envConf = new EnvironmentConfiguration();
54          for (Iterator<String> it = envConf.getKeys(); it.hasNext();)
55          {
56              String var = it.next();
57              assertEquals("Wrong value for " + var, envConf.getString(var),
58                      lookup.lookup(var));
59          }
60      }
61  
62      /**
63       * Tries to lookup a non existing property.
64       */
65      @Test
66      public void testLookupNonExisting()
67      {
68          assertNull("Got result for non existing environment variable", lookup
69                  .lookup("a non existing variable!"));
70      }
71  }