Added INotifyCollectionChanged interface to ObservableCollection and ObservableDictionary; added a new dictionary type, the MultiDictionary which is equivalent to the C++ multimap<> class

git-svn-id: file:///srv/devel/repo-conversion/nusu@215 d2e56fa2-650e-0410-a79f-9358c0239efd

Source/Collections/MultiDictionary.Test.cs

@@ -0,0 +1,146 @@
+#region CPL License
+/*
+Nuclex Framework
+Copyright (C) 2002-2010 Nuclex Development Labs
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the IBM Common Public License as
+published by the IBM Corporation; either version 1.0 of the
+License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+IBM Common Public License for more details.
+
+You should have received a copy of the IBM Common Public
+License along with this library
+*/
+#endregion
+
+using System;
+using System.Collections.Generic;
+
+#if UNITTEST
+
+using NUnit.Framework;
+using NMock;
+
+namespace Nuclex.Support.Collections {
+
+  /// <summary>Unit tests for the multi dictionary</summary>
+  [TestFixture]
+  public class MultiDictionaryTest {
+
+    /// <summary>
+    ///   Verifies that new instances of the multi dictionary can be created
+    /// </summary>
+    [Test]
+    public void CanConstructNewDictionary() {
+      var dictionary = new MultiDictionary<int, string>();
+      Assert.IsNotNull(dictionary); // nonsense, prevents compiler warning
+    }
+
+    /// <summary>
+    ///   Verifies that a new multi dictionary based on a read-only dictionary is
+    ///   also read-only
+    /// </summary>
+    [Test]
+    public void IsReadOnlyWhenBasedOnReadOnlyContainer() {
+      var readOnly = new ReadOnlyDictionary<int, ICollection<string>>(
+        new Dictionary<int, ICollection<string>>()
+      );
+      var dictionary = new MultiDictionary<int, string>(readOnly);
+
+      Assert.IsTrue(dictionary.IsReadOnly);
+    }
+
+    /// <summary>
+    ///   Ensures that the multi dictionary can contain the same key multiple times
+    ///   (or in other words, multiple values on the same key)
+    /// </summary>
+    [Test]
+    public void CanContainKeyMultipleTimes() {
+      var dictionary = new MultiDictionary<int, string>();
+      dictionary.Add(123, "one two three");
+      dictionary.Add(123, "eins zwei drei");
+
+      Assert.AreEqual(2, dictionary.Count);
+
+      CollectionAssert.AreEquivalent(
+        new KeyValuePair<int, string>[] {
+          new KeyValuePair<int, string>(123, "one two three"),
+          new KeyValuePair<int, string>(123, "eins zwei drei")
+        },
+        dictionary
+      );
+    }
+
+    /// <summary>
+    ///   Verifies that adding values through the indexer still updates the item count
+    /// </summary>
+    [Test]
+    public void AddingValuesFromIndexerUpdatesCount() {
+      var dictionary = new MultiDictionary<int, string>();
+      dictionary.Add(42, "the answer to everything");
+      dictionary[42].Add("21x2");
+
+      Assert.AreEqual(2, dictionary.Count);
+
+      CollectionAssert.AreEquivalent(
+        new KeyValuePair<int, string>[] {
+          new KeyValuePair<int, string>(42, "the answer to everything"),
+          new KeyValuePair<int, string>(42, "21x2")
+        },
+        dictionary
+      );
+    }
+
+    /// <summary>
+    ///   Tests whether the collection can count the number of values stored
+    ///   under a key
+    /// </summary>
+    [Test]
+    public void ValuesWithSameKeyCanBeCounted() {
+      var dictionary = new MultiDictionary<int, string>();
+      dictionary.Add(10, "ten");
+      dictionary.Add(20, "twenty");
+      dictionary.Add(30, "thirty");
+      dictionary.Add(10, "zehn");
+      dictionary.Add(20, "zwanzig");
+      dictionary.Add(10, "dix");
+
+      Assert.AreEqual(6, dictionary.Count);
+      Assert.AreEqual(3, dictionary.CountValues(10));
+      Assert.AreEqual(2, dictionary.CountValues(20));
+      Assert.AreEqual(1, dictionary.CountValues(30));
+    }
+
+    /// <summary>
+    ///   Ensures that its possible to remove values individually without affecting
+    ///   other values stored under the same key
+    /// </summary>
+    [Test]
+    public void ValuesCanBeRemovedIndividually() {
+      var dictionary = new MultiDictionary<int, string>();
+      dictionary.Add(10, "ten");
+      dictionary.Add(10, "zehn");
+      dictionary.Add(10, "dix");
+
+      dictionary.Remove(10, "zehn");
+
+      Assert.AreEqual(2, dictionary.Count);
+      CollectionAssert.AreEquivalent(
+        new KeyValuePair<int, string>[] {
+          new KeyValuePair<int, string>(10, "ten"),
+          new KeyValuePair<int, string>(10, "dix")
+        },
+        dictionary
+      );
+    }
+
+  }
+
+} // namespace Nuclex.Support.Collections
+
+#endif // UNITTEST