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.configuration2.interpol;
18
19 import static org.junit.jupiter.api.Assertions.assertEquals;
20 import static org.junit.jupiter.api.Assertions.assertNull;
21
22 import java.util.Map;
23
24 import org.junit.jupiter.api.BeforeEach;
25 import org.junit.jupiter.api.Test;
26
27 /**
28 * Test class for {@code SystemPropertiesLookup}.
29 */
30 public class TestSystemPropertiesLookup {
31 /** The lookup object to be tested. */
32 private Lookup lookup;
33
34 @BeforeEach
35 public void setUp() throws Exception {
36 lookup = DefaultLookups.SYSTEM_PROPERTIES.getLookup();
37 }
38
39 /**
40 * Tests whether system properties can be looked up.
41 */
42 @Test
43 public void testLookupProperties() {
44 for (final Map.Entry<Object, Object> e : System.getProperties().entrySet()) {
45 assertEquals(e.getValue(), lookup.lookup(String.valueOf(e.getKey())), "Wrong property value for " + e.getKey());
46 }
47 }
48
49 /**
50 * Tests whether an unknown property is handled correctly.
51 */
52 @Test
53 public void testLookupUnknownProperty() {
54 assertNull(lookup.lookup("a non existing system property!"));
55 }
56 }