113 lines
3.1 KiB
C#
113 lines
3.1 KiB
C#
// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
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// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
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using System;
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using System.Windows.Threading;
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using ICSharpCode.AvalonEdit.Document;
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using ICSharpCode.AvalonEdit.Editing;
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using ICSharpCode.AvalonEdit.Rendering;
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using NUnit.Framework;
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namespace ICSharpCode.AvalonEdit
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{
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[TestFixture]
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public class WeakReferenceTests
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{
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[Test]
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public void TextViewCanBeCollectedTest()
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{
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TextView textView = new TextView();
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WeakReference wr = new WeakReference(textView);
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textView = null;
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GarbageCollect();
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Assert.IsFalse(wr.IsAlive);
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}
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[Test]
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public void DocumentDoesNotHoldReferenceToTextView()
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{
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TextDocument textDocument = new TextDocument();
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Assert.AreEqual(0, textDocument.LineTrackers.Count);
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TextView textView = new TextView();
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WeakReference wr = new WeakReference(textView);
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textView.Document = textDocument;
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Assert.AreEqual(1, textDocument.LineTrackers.Count);
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textView = null;
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GarbageCollect();
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Assert.IsFalse(wr.IsAlive);
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// document cannot immediately clear the line tracker
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Assert.AreEqual(1, textDocument.LineTrackers.Count);
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// but it should clear it on the next change
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textDocument.Insert(0, "a");
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Assert.AreEqual(0, textDocument.LineTrackers.Count);
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}
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[Test]
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public void DocumentDoesNotHoldReferenceToTextArea()
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{
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TextDocument textDocument = new TextDocument();
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TextArea textArea = new TextArea();
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WeakReference wr = new WeakReference(textArea);
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textArea.Document = textDocument;
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textArea = null;
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GarbageCollect();
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Assert.IsFalse(wr.IsAlive);
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GC.KeepAlive(textDocument);
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}
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[Test]
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public void DocumentDoesNotHoldReferenceToTextEditor()
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{
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TextDocument textDocument = new TextDocument();
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TextEditor textEditor = new TextEditor();
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WeakReference wr = new WeakReference(textEditor);
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textEditor.Document = textDocument;
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textEditor = null;
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GarbageCollect();
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Assert.IsFalse(wr.IsAlive);
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GC.KeepAlive(textDocument);
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}
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[Test]
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public void DocumentDoesNotHoldReferenceToLineMargin()
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{
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TextDocument textDocument = new TextDocument();
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WeakReference wr = DocumentDoesNotHoldReferenceToLineMargin_CreateMargin(textDocument);
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GarbageCollect();
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Assert.IsFalse(wr.IsAlive);
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GC.KeepAlive(textDocument);
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}
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// using a method to ensure the local variables can be garbage collected after the method returns
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WeakReference DocumentDoesNotHoldReferenceToLineMargin_CreateMargin(TextDocument textDocument)
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{
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TextView textView = new TextView() {
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Document = textDocument
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};
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LineNumberMargin margin = new LineNumberMargin() {
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TextView = textView
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};
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return new WeakReference(textView);
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}
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static void GarbageCollect()
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{
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for (int i = 0; i < 3; i++) {
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GC.WaitForPendingFinalizers();
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GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);
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// pump WPF messages so that WeakEventManager can unregister
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Dispatcher.CurrentDispatcher.Invoke(DispatcherPriority.Background, new Action(delegate {}));
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}
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}
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}
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}
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