mcs/class/corlib/Test/System/LazyTest.cs

   1 //
   2 // LazyTest.cs - NUnit Test Cases for Lazy
   3 //
   4 // Author:
   5 //      Zoltan Varga (vargaz@gmail.com)
   6 //
   7 // Copyright (C) 2009 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 #if NET_4_0
  30
  31 using System;
  32 using System.Reflection;
  33 using System.Reflection.Emit;
  34 using System.Threading;
  35 using NUnit.Framework;
  36
  37 #pragma warning disable 219
  38 #pragma warning disable 168
  39
  40 namespace MonoTests.System
  41 {
  42         [TestFixture]
  43         public class LazyTest
  44         {
  45                 [Test]
  46                 [ExpectedException (typeof (ArgumentNullException))]
  47                 public void Ctor_Null_1 () {
  48                         new Lazy<int> (null);
  49                 }
  50
  51                 [Test]
  52                 [ExpectedException (typeof (ArgumentNullException))]
  53                 public void Ctor_Null_2 () {
  54                         new Lazy<int> (null, false);
  55                 }
  56
  57                 [Test]
  58                 public void IsValueCreated () {
  59                         var l1 = new Lazy<int> ();
  60
  61                         Assert.IsFalse (l1.IsValueCreated);
  62
  63                         int i = l1.Value;
  64
  65                         Assert.IsTrue (l1.IsValueCreated);
  66                 }
  67
  68                 [Test]
  69                 public void DefaultCtor () {
  70                         var l1 = new Lazy<DefaultCtorClass> ();
  71
  72                         var o = l1.Value;
  73                         Assert.AreEqual (5, o.Prop);
  74                 }
  75
  76                 class DefaultCtorClass {
  77                         public DefaultCtorClass () {
  78                                 Prop = 5;
  79                         }
  80
  81                         public int Prop {
  82                                 get; set;
  83                         }
  84                 }
  85
  86                 [Test]
  87                 public void NoDefaultCtor () {
  88                         var l1 = new Lazy<NoDefaultCtorClass> ();
  89
  90                         try {
  91                                 var o = l1.Value;
  92                                 Assert.Fail ();
  93                         } catch (MissingMemberException) {
  94                         }
  95                 }
  96
  97                 class NoDefaultCtorClass {
  98                         public NoDefaultCtorClass (int i) {
  99                         }
 100                 }
 101
 102                 [Test]
 103                 public void NotThreadSafe () {
 104                         var l1 = new Lazy<int> ();
 105
 106                         Assert.AreEqual (0, l1.Value);
 107
 108                         var l2 = new Lazy<int> (delegate () { return 42; });
 109
 110                         Assert.AreEqual (42, l2.Value);
 111                 }
 112
 113                 static int counter;
 114
 115                 [Test]
 116                 public void EnsureSingleThreadSafeExecution () {
 117                         counter = 42;
 118
 119                         //var l = new Lazy<int> (delegate () { return counter ++; }, LazyExecutionMode.NotThreadSafe);
 120                         var l = new Lazy<int> (delegate () { return counter ++; }, true);
 121
 122                         object monitor = new object ();
 123                         var threads = new Thread [10];
 124                         for (int i = 0; i < 10; ++i) {
 125                                 threads [i] = new Thread (delegate () {
 126                                                 lock (monitor) {
 127                                                         Monitor.Wait (monitor);
 128                                                 }
 129                                                 int val = l.Value;
 130                                         });
 131                         }
 132                         for (int i = 0; i < 10; ++i)
 133                                 threads [i].Start ();
 134                         lock (monitor)
 135                                 Monitor.PulseAll (monitor);
 136
 137                         Assert.AreEqual (42, l.Value);
 138                 }
 139
 140                 [Test]
 141                 public void InitRecursion ()
 142                 {
 143                         Lazy<DefaultCtorClass> c = null;
 144                         c = new Lazy<DefaultCtorClass> (() => { Console.WriteLine (c.Value); return null; });
 145
 146                         try {
 147                                 var r = c.Value;
 148                                 Assert.Fail ();
 149                         } catch (InvalidOperationException) {
 150                         }
 151                 }
 152         }
 153 }
 154
 155 #endif