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 * https://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
32 /** The lookup object to be tested. */
33 private Lookup lookup;
34
35 @BeforeEach
36 public void setUp() throws Exception {
37 lookup = DefaultLookups.SYSTEM_PROPERTIES.getLookup();
38 }
39
40 /**
41 * Tests whether system properties can be looked up.
42 */
43 @Test
44 void testLookupProperties() {
45 for (final Map.Entry<Object, Object> e : System.getProperties().entrySet()) {
46 assertEquals(e.getValue(), lookup.lookup(String.valueOf(e.getKey())), "Wrong property value for " + e.getKey());
47 }
48 }
49
50 /**
51 * Tests whether an unknown property is handled correctly.
52 */
53 @Test
54 void testLookupUnknownProperty() {
55 assertNull(lookup.lookup("a non existing system property!"));
56 }
57 }