1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
//-----------------------------------------------------------------------
// <copyright file="EnumerableCacheTests.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// This code is released under the Microsoft Public License (Ms-PL).
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.Test.Messaging {
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using DotNetOpenAuth.Messaging;
using NUnit.Framework;
/// <summary>
/// Tests for cached enumeration.
/// </summary>
[TestFixture]
public class EnumerableCacheTests {
/// <summary>
/// The number of times the generator method's implementation is started.
/// </summary>
private int generatorInvocations;
/// <summary>
/// The number of times the end of the generator method's implementation is reached.
/// </summary>
private int generatorCompleted;
/// <summary>
/// Sets up a test.
/// </summary>
[SetUp]
public void Setup() {
this.generatorInvocations = 0;
this.generatorCompleted = 0;
}
[Test]
public void EnumerableCache() {
// Baseline
var generator = this.NumberGenerator();
var list1 = generator.ToList();
var list2 = generator.ToList();
Assert.AreEqual(2, this.generatorInvocations);
CollectionAssert.AreEqual(list1, list2);
// Cache behavior
this.generatorInvocations = 0;
this.generatorCompleted = 0;
generator = this.NumberGenerator().CacheGeneratedResults();
var list3 = generator.ToList();
var list4 = generator.ToList();
Assert.AreEqual(1, this.generatorInvocations);
Assert.AreEqual(1, this.generatorCompleted);
CollectionAssert.AreEqual(list1, list3);
CollectionAssert.AreEqual(list1, list4);
}
[Test]
public void GeneratesOnlyRequiredElements() {
var generator = this.NumberGenerator().CacheGeneratedResults();
Assert.AreEqual(0, this.generatorInvocations);
generator.Take(2).ToList();
Assert.AreEqual(1, this.generatorInvocations);
Assert.AreEqual(0, this.generatorCompleted, "Only taking part of the list should not have completed the generator.");
}
[Test]
public void PassThruDoubleCache() {
var cache1 = this.NumberGenerator().CacheGeneratedResults();
var cache2 = cache1.CacheGeneratedResults();
Assert.AreSame(cache1, cache2, "Two caches were set up rather than just sharing the first one.");
}
[Test]
public void PassThruList() {
var list = this.NumberGenerator().ToList();
var cache = list.CacheGeneratedResults();
Assert.AreSame(list, cache);
}
[Test]
public void PassThruArray() {
var array = this.NumberGenerator().ToArray();
var cache = array.CacheGeneratedResults();
Assert.AreSame(array, cache);
}
[Test]
public void PassThruCollection() {
var collection = new Collection<int>();
var cache = collection.CacheGeneratedResults();
Assert.AreSame(collection, cache);
}
/// <summary>
/// Tests calling IEnumerator.Current before first call to MoveNext.
/// </summary>
[Test, ExpectedException(typeof(InvalidOperationException))]
public void EnumerableCacheCurrentThrowsBefore() {
var foo = this.NumberGenerator().CacheGeneratedResults().GetEnumerator().Current;
}
/// <summary>
/// Tests calling IEnumerator.Current after MoveNext returns false.
/// </summary>
[Test, ExpectedException(typeof(InvalidOperationException))]
public void EnumerableCacheCurrentThrowsAfter() {
var enumerator = this.NumberGenerator().CacheGeneratedResults().GetEnumerator();
while (enumerator.MoveNext()) {
}
var foo = enumerator.Current;
}
private IEnumerable<int> NumberGenerator() {
this.generatorInvocations++;
for (int i = 10; i < 15; i++) {
yield return i;
}
this.generatorCompleted++;
}
}
}
|
