mcs/class/corlib/Test/System.Threading/LazyInitializerTest.cs

   1 //
   2 // LazyInitializerTest.cs
   3 //
   4 // Authors:
   5 //       Marek Safar (marek.safar@gmail.com)
   6 //
   7 // Copyright 2011 Xamarin, Inc (http://www.xamarin.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.Threading;
  33 using NUnit.Framework;
  34
  35 namespace MonoTests.System.Threading
  36 {
  37         [TestFixture]
  38         public class LazyInitializerTest
  39         {
  40                 class C
  41                 {
  42                         public C ()
  43                         {
  44                                 ++Counter;
  45                         }
  46
  47                         public int Counter { get; private set; }
  48                 }
  49
  50                 [Test]
  51                 public void EnsureInitialized_Simple ()
  52                 {
  53                         C c = null;
  54                         c = LazyInitializer.EnsureInitialized (ref c);
  55
  56                         Assert.IsNotNull (c, "#1");
  57                         Assert.AreEqual (1, c.Counter, "#2");
  58                 }
  59
  60                 [Test]
  61                 public void EnsureInitialized_FactoryIsNull ()
  62                 {
  63                         C c = null;
  64                         try {
  65                                 LazyInitializer.EnsureInitialized (ref c, () => (C) null);
  66                                 Assert.Fail ();
  67                         } catch (InvalidOperationException) {
  68                         }
  69                 }
  70
  71                 [Test]
  72                 public void EnsureInitialized_NullLock ()
  73                 {
  74                         C c = null;
  75                         bool init = false;
  76                         object sync_lock = null;
  77                         c = LazyInitializer.EnsureInitialized (ref c, ref init, ref sync_lock);
  78
  79                         Assert.IsNotNull (c, "#1");
  80                         Assert.AreEqual (1, c.Counter, "#2");
  81                         Assert.IsTrue (init, "#3");
  82                         Assert.IsNotNull (sync_lock, "#4");
  83
  84                         var old_lock = sync_lock;
  85                         var d = LazyInitializer.EnsureInitialized (ref c, ref init, ref sync_lock);
  86
  87                         Assert.AreEqual (c, d, "#11");
  88                         Assert.AreEqual (1, c.Counter, "#12");
  89                         Assert.IsTrue (init, "#13");
  90                         Assert.AreEqual (old_lock, sync_lock, "#14");
  91                 }
  92         }
  93 }
  94
  95 #endif
  96