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
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
using System;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Collections;
namespace Tests
{
public partial class Tests
{
[TestMethod]
public void Create_Arguments()
{
AssertThrows<ArgumentNullException>(() => EnumerableEx.Create<int>(default(Func<IEnumerator<int>>)));
}
[TestMethod]
public void Create1()
{
var hot = false;
var res = EnumerableEx.Create<int>(() =>
{
hot = true;
return MyEnumerator();
});
Assert.IsFalse(hot);
var e = res.GetEnumerator();
Assert.IsTrue(hot);
HasNext(e, 1);
HasNext(e, 2);
NoNext(e);
hot = false;
var f = ((IEnumerable)res).GetEnumerator();
Assert.IsTrue(hot);
}
private static IEnumerator<int> MyEnumerator()
{
yield return 1;
yield return 2;
}
[TestMethod]
public void Return()
{
Assert.AreEqual(42, EnumerableEx.Return(42).Single());
}
[TestMethod]
public void Throw_Arguments()
{
AssertThrows<ArgumentNullException>(() => EnumerableEx.Throw<int>(null));
}
[TestMethod]
public void Throw()
{
var ex = new MyException();
var xs = EnumerableEx.Throw<int>(ex);
var e = xs.GetEnumerator();
AssertThrows<MyException>(() => e.MoveNext());
}
[TestMethod]
public void Defer_Arguments()
{
AssertThrows<ArgumentNullException>(() => EnumerableEx.Defer<int>(null));
}
[TestMethod]
public void Defer1()
{
var i = 0;
var n = 5;
var xs = EnumerableEx.Defer(() =>
{
i++;
return Enumerable.Range(0, n);
});
Assert.AreEqual(0, i);
Assert.IsTrue(Enumerable.SequenceEqual(xs, Enumerable.Range(0, n)));
Assert.AreEqual(1, i);
n = 3;
Assert.IsTrue(Enumerable.SequenceEqual(xs, Enumerable.Range(0, n)));
Assert.AreEqual(2, i);
}
[TestMethod]
public void Defer2()
{
var xs = EnumerableEx.Defer<int>(() =>
{
throw new MyException();
});
AssertThrows<MyException>(() => xs.GetEnumerator().MoveNext());
}
[TestMethod]
public void Generate_Arguments()
{
AssertThrows<ArgumentNullException>(() => EnumerableEx.Generate<int, int>(0, null, _ => _, _ => _));
AssertThrows<ArgumentNullException>(() => EnumerableEx.Generate<int, int>(0, _ => true, null, _ => _));
AssertThrows<ArgumentNullException>(() => EnumerableEx.Generate<int, int>(0, _ => true, _ => _, null));
}
[TestMethod]
public void Generate()
{
var res = EnumerableEx.Generate(0, x => x < 5, x => x + 1, x => x * x).ToList();
Assert.IsTrue(Enumerable.SequenceEqual(res, new[] { 0, 1, 4, 9, 16 }));
}
[TestMethod]
public void Using_Arguments()
{
AssertThrows<ArgumentNullException>(() => EnumerableEx.Using<int, MyDisposable>(null, d => new[] { 1 }));
AssertThrows<ArgumentNullException>(() => EnumerableEx.Using<int, MyDisposable>(() => new MyDisposable(), null));
}
[TestMethod]
public void Using1()
{
var d = default(MyDisposable);
var xs = EnumerableEx.Using(() => d = new MyDisposable(), d_ => new[] { 1 });
Assert.IsNull(d);
var d1 = default(MyDisposable);
xs.ForEach(_ => { d1 = d; Assert.IsNotNull(d1); Assert.IsFalse(d1.Done); });
Assert.IsTrue(d1.Done);
var d2 = default(MyDisposable);
xs.ForEach(_ => { d2 = d; Assert.IsNotNull(d2); Assert.IsFalse(d2.Done); });
Assert.IsTrue(d2.Done);
Assert.AreNotSame(d1, d2);
}
[TestMethod]
public void Using2()
{
var d = default(MyDisposable);
var xs = EnumerableEx.Using(() => d = new MyDisposable(), d_ => EnumerableEx.Throw<int>(new MyException()));
Assert.IsNull(d);
AssertThrows<MyException>(() => xs.ForEach(_ => { }));
Assert.IsTrue(d.Done);
}
[TestMethod]
public void Using3()
{
var d = default(MyDisposable);
var xs = EnumerableEx.Using<int, MyDisposable>(() => d = new MyDisposable(), d_ => { throw new MyException(); });
Assert.IsNull(d);
AssertThrows<MyException>(() => xs.ForEach(_ => { }));
Assert.IsTrue(d.Done);
}
class MyDisposable : IDisposable
{
public bool Done;
public void Dispose()
{
Done = true;
}
}
[TestMethod]
public void RepeatElementInfinite()
{
var xs = EnumerableEx.Repeat(42).Take(1000);
Assert.IsTrue(xs.All(x => x == 42));
Assert.IsTrue(xs.Count() == 1000);
}
[TestMethod]
public void RepeatSequence_Arguments()
{
AssertThrows<ArgumentNullException>(() => EnumerableEx.Repeat<int>(null));
AssertThrows<ArgumentNullException>(() => EnumerableEx.Repeat<int>(null, 5));
AssertThrows<ArgumentOutOfRangeException>(() => EnumerableEx.Repeat<int>(new[] { 1 }, -1));
}
[TestMethod]
public void RepeatSequence1()
{
var i = 0;
var xs = new[] { 1, 2 }.Do(_ => i++).Repeat();
var res = xs.Take(10).ToList();
Assert.AreEqual(10, res.Count);
Assert.IsTrue(res.Buffer(2).Select(b => b.Sum()).All(x => x == 3));
Assert.AreEqual(10, i);
}
[TestMethod]
public void RepeatSequence2()
{
var i = 0;
var xs = new[] { 1, 2 }.Do(_ => i++).Repeat(5);
var res = xs.ToList();
Assert.AreEqual(10, res.Count);
Assert.IsTrue(res.Buffer(2).Select(b => b.Sum()).All(x => x == 3));
Assert.AreEqual(10, i);
}
}
}
|
