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

   1 //
   2 // WeakReferenceTest.cs - NUnit Test Cases for WeakReference
   3 //
   4 // Author:
   5 //      Sebastien Pouliot (sebastien@ximian.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 using System;
  30 using System.IO;
  31
  32 using NUnit.Framework;
  33
  34 namespace MonoTests.System {
  35
  36         [TestFixture]
  37         public class WeakReferenceTest {
  38
  39                 [Test]
  40                 public void WeakReference_Object_Null ()
  41                 {
  42                         WeakReference wr = new WeakReference (null);
  43                         Assert.IsFalse (wr.IsAlive, "IsAlive");
  44                         Assert.IsNull (wr.Target, "Target");
  45                         Assert.IsFalse (wr.TrackResurrection, "TrackResurrection");
  46                 }
  47
  48                 [Test]
  49                 public void WeakReference_Object_Null_TrackResurrection_True ()
  50                 {
  51                         WeakReference wr = new WeakReference (null, true);
  52                         Assert.IsFalse (wr.IsAlive, "IsAlive");
  53                         Assert.IsNull (wr.Target, "Target");
  54                         Assert.IsTrue (wr.TrackResurrection, "TrackResurrection");
  55                 }
  56
  57                 [Test]
  58                 public void WeakReference_Object_Null_TrackResurrection_False ()
  59                 {
  60                         WeakReference wr = new WeakReference (null, false);
  61                         Assert.IsFalse (wr.IsAlive, "IsAlive");
  62                         Assert.IsNull (wr.Target, "Target");
  63                         Assert.IsFalse (wr.TrackResurrection, "TrackResurrection");
  64                 }
  65
  66                 [Test]
  67                 public void WeakReference_Object ()
  68                 {
  69                         using (Stream s = Stream.Null) {
  70                                 WeakReference wr = new WeakReference (s);
  71                                 Assert.IsTrue (wr.IsAlive, "IsAlive");
  72                                 Assert.AreSame (s, wr.Target, "Target");
  73                                 Assert.IsFalse (wr.TrackResurrection, "TrackResurrection");
  74                         }
  75                 }
  76
  77                 [Test]
  78                 public void WeakReference_Object_TrackResurrection_True ()
  79                 {
  80                         using (Stream s = Stream.Null) {
  81                                 WeakReference wr = new WeakReference (s, true);
  82                                 Assert.IsTrue (wr.IsAlive, "IsAlive");
  83                                 Assert.AreSame (s, wr.Target, "Target");
  84                                 Assert.IsTrue (wr.TrackResurrection, "TrackResurrection");
  85                         }
  86                 }
  87
  88                 [Test]
  89                 public void WeakReference_Object_TrackResurrection_False ()
  90                 {
  91                         using (Stream s = Stream.Null) {
  92                                 WeakReference wr = new WeakReference (s, false);
  93                                 Assert.IsTrue (wr.IsAlive, "IsAlive");
  94                                 Assert.AreSame (s, wr.Target, "Target");
  95                                 Assert.IsFalse (wr.TrackResurrection, "TrackResurrection");
  96                         }
  97                 }
  98
  99                 class Foo {
 100                         WeakReference wr;
 101
 102                         public static bool failed;
 103
 104                         public Foo () {
 105                                 wr = new WeakReference (new object ());
 106                         }
 107
 108                         ~Foo () {
 109                                 try {
 110                                         var b = wr.IsAlive;
 111                                 } catch (Exception) {
 112                                         failed = true;
 113                                 }
 114                         }
 115                 }
 116
 117                 [Test]
 118                 public void WeakReference_IsAlive_Finalized ()
 119                 {
 120                         var f = new Foo ();
 121                         f = null;
 122                         GC.Collect ();
 123                         GC.WaitForPendingFinalizers ();
 124                         Assert.IsFalse (Foo.failed);
 125                 }
 126         }
 127 }
 128