116 lines
3.9 KiB
C#
116 lines
3.9 KiB
C#
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#region CPL License
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/*
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Nuclex Framework
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Copyright (C) 2002-2008 Nuclex Development Labs
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This library is free software; you can redistribute it and/or
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modify it under the terms of the IBM Common Public License as
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published by the IBM Corporation; either version 1.0 of the
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License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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IBM Common Public License for more details.
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You should have received a copy of the IBM Common Public
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License along with this library
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*/
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#endregion
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using System;
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using System.IO;
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using System.Runtime.Serialization.Formatters.Binary;
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#if UNITTEST
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using NUnit.Framework;
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using NUnit.Framework.SyntaxHelpers;
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namespace Nuclex.Support {
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/// <summary>Unit Test for the strongly typed weak reference class</summary>
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[TestFixture]
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public class WeakReferenceTest {
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#region class Dummy
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/// <summary>Dummy class for testing the shared instance provider</summary>
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[Serializable]
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private class Dummy {
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/// <summary>Initializes a new dummy</summary>
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public Dummy() { }
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}
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#endregion // class Dummy
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/// <summary>Tests whether the simple constructor works</summary>
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[Test]
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public void TestSimpleConstructor() {
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new WeakReference<Dummy>(new Dummy());
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}
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/// <summary>Test whether the full constructor works</summary>
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[Test]
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public void TestFullConstructor() {
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new WeakReference<Dummy>(new Dummy(), false);
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}
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/// <summary>
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/// Test whether the target object can be retrieved from the weak reference
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/// </summary>
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[Test]
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public void TestTargetRetrieval() {
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Dummy strongReference = new Dummy();
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WeakReference<Dummy> weakReference = new WeakReference<Dummy>(strongReference);
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// We can not just call GC.Collect() and base our test on the assumption, that
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// the garbage collector will actually collect the Dummy instance. This is up
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// to the garbage collector to decide. But we can keep a strong reference in
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// parallel and safely assume that the WeakReference will not be invalidated!
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Assert.AreSame(strongReference, weakReference.Target);
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}
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/// <summary>
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/// Test whether the target object can be reassigned in the weak reference
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/// </summary>
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[Test]
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public void TestTargetReassignment() {
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Dummy strongReference1 = new Dummy();
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Dummy strongReference2 = new Dummy();
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WeakReference<Dummy> weakReference = new WeakReference<Dummy>(strongReference1);
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Assert.AreSame(strongReference1, weakReference.Target);
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weakReference.Target = strongReference2;
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Assert.AreSame(strongReference2, weakReference.Target);
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}
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/// <summary>
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/// Test whether the target object can be reassigned in the weak reference
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/// </summary>
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[Test]
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public void TestSerialization() {
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BinaryFormatter formatter = new BinaryFormatter();
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using(MemoryStream memory = new MemoryStream()) {
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WeakReference<Dummy> weakReference1 = new WeakReference<Dummy>(new Dummy());
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formatter.Serialize(memory, weakReference1);
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memory.Position = 0;
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object weakReference2 = formatter.Deserialize(memory);
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// We cannot make any more predictions but for the type of the weak reference.
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// The pointee might have been garbage collected just now or the serializer
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// might have decided not to serialize the pointee at all (which is a valid
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// decision if the serializer found no strong reference to the pointee) in
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// another of the object graph.
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Assert.IsNotNull(weakReference2 as WeakReference<Dummy>);
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}
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}
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}
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} // namespace Nuclex.Support
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#endif // UNITTEST
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