Moved all unit test files into a separate directory in preparation for splitting the project

Tests/Collections/ParentingCollectionTest.cs

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+#region Apache License 2.0
+/*
+Nuclex .NET Framework
+Copyright (C) 2002-2024 Markus Ewald / Nuclex Development Labs
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+#endregion // Apache License 2.0
+
+using System;
+using System.Collections.Generic;
+
+#if UNITTEST
+
+using NUnit.Framework;
+
+namespace Nuclex.Support.Collections {
+
+  /// <summary>Unit Test for the Parenting Collection class</summary>
+  [TestFixture]
+  internal class ParentingCollectionTest {
+
+    #region class TestParentable
+
+    /// <summary>Parentable object that can be the child of an int</summary>
+    private class TestParentable : Parentable<int>, IDisposable {
+
+      /// <summary>Initializes a new instance of the parentable test class</summary>
+      public TestParentable() { }
+
+      /// <summary>The parent object that owns this instance</summary>
+      public int GetParent() {
+        return base.Parent;
+      }
+
+      /// <summary>Immediately releases all resources owned by the item</summary>
+      public void Dispose() {
+        this.disposeCalled = true;
+      }
+
+      /// <summary>Whether Dispose() has been called on this item</summary>
+      public bool DisposeCalled {
+        get { return this.disposeCalled; }
+      }
+
+      /// <summary>Whether Dispose() has been called on this item</summary>
+      private bool disposeCalled;
+
+    }
+
+    #endregion // class TestParentable
+
+    #region class TestParentingCollection
+
+    /// <summary>Parentable object that can be the child of an int</summary>
+    private class TestParentingCollection : ParentingCollection<int, TestParentable> {
+
+      /// <summary>Changes the parent of the collection</summary>
+      /// <param name="parent">New parent to assign to the collection</param>
+      public void SetParent(int parent) {
+        base.Reparent(parent);
+      }
+
+      /// <summary>Disposes all items contained in the collection</summary>
+      public new void DisposeItems() {
+        base.DisposeItems();
+      }
+
+    }
+
+    #endregion // class TestParentingCollection
+
+    /// <summary>
+    ///   Tests whether the parenting collection propagates its parent to an item that
+    ///   is added to the collection after the collection's aprent is already assigned
+    /// </summary>
+    [Test]
+    public void TestPropagatePreassignedParent() {
+      TestParentingCollection testCollection = new TestParentingCollection();
+      TestParentable testParentable = new TestParentable();
+
+      testCollection.SetParent(54321);
+      testCollection.Add(testParentable);
+
+      Assert.AreEqual(54321, testParentable.GetParent());
+    }
+
+    /// <summary>
+    ///   Tests whether the parenting collection propagates a new parent to all items
+    ///   contained in it when its parent is changed
+    /// </summary>
+    [Test]
+    public void TestPropagateParentChange() {
+      TestParentingCollection testCollection = new TestParentingCollection();
+      TestParentable testParentable = new TestParentable();
+
+      testCollection.Add(testParentable);
+      testCollection.SetParent(54321);
+
+      Assert.AreEqual(54321, testParentable.GetParent());
+    }
+
+    /// <summary>
+    ///   Tests whether the parenting collection propagates its parent to an item that
+    ///   is added to the collection after the collection's aprent is already assigned
+    /// </summary>
+    [Test]
+    public void TestPropagateParentOnReplace() {
+      TestParentingCollection testCollection = new TestParentingCollection();
+      TestParentable testParentable1 = new TestParentable();
+      TestParentable testParentable2 = new TestParentable();
+
+      testCollection.SetParent(54321);
+      testCollection.Add(testParentable1);
+      testCollection[0] = testParentable2;
+
+      Assert.AreEqual(0, testParentable1.GetParent());
+      Assert.AreEqual(54321, testParentable2.GetParent());
+    }
+
+    /// <summary>
+    ///   Tests whether the parenting collection unsets the parent when an item is removed
+    ///   from the collection
+    /// </summary>
+    [Test]
+    public void TestUnsetParentOnRemoveItem() {
+      TestParentingCollection testCollection = new TestParentingCollection();
+      TestParentable testParentable = new TestParentable();
+
+      testCollection.Add(testParentable);
+      testCollection.SetParent(54321);
+
+      Assert.AreEqual(54321, testParentable.GetParent());
+
+      testCollection.RemoveAt(0);
+
+      Assert.AreEqual(0, testParentable.GetParent());
+    }
+
+    /// <summary>
+    ///   Tests whether the parenting collection unsets the parent when all item are
+    ///   removed from the collection by clearing it
+    /// </summary>
+    [Test]
+    public void TestUnsetParentOnClear() {
+      TestParentingCollection testCollection = new TestParentingCollection();
+      TestParentable testParentable = new TestParentable();
+
+      testCollection.Add(testParentable);
+      testCollection.SetParent(54321);
+
+      Assert.AreEqual(54321, testParentable.GetParent());
+
+      testCollection.Clear();
+
+      Assert.AreEqual(0, testParentable.GetParent());
+    }
+
+    /// <summary>
+    ///   Tests whether the parenting collection calls Dispose() on all contained items
+    ///   that implement IDisposable when its DisposeItems() method is called
+    /// </summary>
+    [Test]
+    public void TestDisposeItems() {
+      TestParentingCollection testCollection = new TestParentingCollection();
+      TestParentable testParentable = new TestParentable();
+
+      testCollection.Add(testParentable);
+
+      testCollection.DisposeItems();
+
+      Assert.IsTrue(testParentable.DisposeCalled);
+    }
+
+  }
+
+} // namespace Nuclex.Support.Collections
+
+#endif // UNITTEST