1   /*
2    * Copyright (C) 2011 The Guava Authors
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5    * in compliance with the License. You may obtain a copy of the License at
6    *
7    * http://www.apache.org/licenses/LICENSE-2.0
8    *
9    * Unless required by applicable law or agreed to in writing, software distributed under the License
10   * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11   * or implied. See the License for the specific language governing permissions and limitations under
12   * the License.
13   */
14  
15  package com.google.common.collect;
16  
17  import com.google.common.annotations.GwtCompatible;
18  
19  import junit.framework.TestCase;
20  
21  import java.util.SortedSet;
22  
23  /**
24   * Unit tests for {@code SortedIterables}.
25   *
26   * @author Louis Wasserman
27   */
28  @GwtCompatible
29  public class SortedIterablesTest extends TestCase {
30    public void testSameComparator() {
31      assertTrue(SortedIterables.hasSameComparator(Ordering.natural(), Sets.newTreeSet()));
32      // Before JDK6 (including under GWT), the TreeMap keySet is a plain Set.
33      if (Maps.newTreeMap().keySet() instanceof SortedSet) {
34        assertTrue(
35            SortedIterables.hasSameComparator(Ordering.natural(), Maps.newTreeMap().keySet()));
36      }
37      assertTrue(SortedIterables.hasSameComparator(Ordering.natural().reverse(),
38          Sets.newTreeSet(Ordering.natural().reverse())));
39    }
40  
41    public void testComparator() {
42      assertEquals(Ordering.natural(), SortedIterables.comparator(Sets.newTreeSet()));
43    }
44  }