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1 package com.thoughtworks.xstream.core.util;
2
3 import junit.framework.TestCase;
4
5 import java.util.Iterator  ;
6
7 public class PrioritizedListTest extends TestCase {
8
9 private void assertNextEquals(Object expected, Iterator iterator) {
10 assertTrue("Expected to pull of another item from iterator : " + expected, iterator.hasNext());
11 assertEquals(expected, iterator.next());
12 }
13
14 private void assertNoMore(Iterator iterator) {
15 assertFalse("Should be no more items in iterator", iterator.hasNext());
16 }
17
18 public void testIteratesOverElementsInReverseOrderTheyWereAdded() {
19 PrioritizedList list = new PrioritizedList();
20 list.add("one");
21 list.add("two");
22 list.add("three");
23
24 Iterator iterator = list.iterator();
25 assertNextEquals("three", iterator);
26 assertNextEquals("two", iterator);
27 assertNextEquals("one", iterator);
28 assertNoMore(iterator);
29 }
30
31 public void testHandlesMultipleIsolatedIterators() {
32 PrioritizedList list = new PrioritizedList();
33 list.add("one");
34 list.add("two");
35
36 Iterator iteratorOne = list.iterator();
37 assertNextEquals("two", iteratorOne);
38
39 Iterator iteratorTwo = list.iterator();
40 assertNextEquals("one", iteratorOne);
41
42 assertNextEquals("two", iteratorTwo);
43 assertNextEquals("one", iteratorTwo);
44
45 assertNoMore(iteratorTwo);
46 assertNoMore(iteratorOne);
47 }
48
49 public void testIteratesOverHighestPriorityItemsFirst() {
50 PrioritizedList list = new PrioritizedList();
51 list.add("medium one", 0);
52 list.add("high one", 1);
53 list.add("low one", -1);
54 list.add("very high", 4);
55 list.add("low two", -1);
56 list.add("medium two", 0);
57 list.add("VERY VERY high", 100);
58 list.add("high two", 1);
59 list.add("very low", -4);
60 list.add("VERY VERY low", -100);
61
62 Iterator iterator = list.iterator();
63 assertNextEquals("VERY VERY high", iterator);
64 assertNextEquals("very high", iterator);
65 assertNextEquals("high two", iterator);
66 assertNextEquals("high one", iterator);
67 assertNextEquals("medium two", iterator);
68 assertNextEquals("medium one", iterator);
69 assertNextEquals("low two", iterator);
70 assertNextEquals("low one", iterator);
71 assertNextEquals("very low", iterator);
72 assertNextEquals("VERY VERY low", iterator);
73 assertNoMore(iterator);
74 }
75
76 public void testAllowsIteratorToStartAtSpecificPriority() {
77 PrioritizedList list = new PrioritizedList();
78 list.add("low one", -1);
79 list.add("low two", -1);
80 list.add("medium one", 0);
81
82 assertEquals("low two", list.firstOfLowestPriority());
83 }
84 }
85 |
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