Introduced specialized AttributeDictionary view model for unit tests

The `AttributeDictionaryConstructorTopicViewModel` provides a more specialized model for evaluating the `AttributeDictionary` mapping capabilities added to the `TopicMappingService` (see #99). This builds off of the existing `PageTopicViewModel` by including both a `MappedProperty` (which will get mapped by the constructor) and an `UnmappedProperty` (which will not get mapped by the constructor). This allows us to confirm that the `AttributeDictionary` constructor did, in fact, get called, since otherwise the `UnmappedProperty` would get picked up by `SetPropertyAsync()`.

As part of this, I also extended the attributes in the test to ensure that it isn't falling under the recently introduced threshold for honoring the `AttributeDictionary` constructor (2e157e5).

Author: JeremyCaney

OnTopic.Tests/TopicMappingServiceTest.cs

@@ -295,13 +295,29 @@ public async Task Map_AttributeDictionary_ReturnsNewModel() {
       var topic                 = new Topic("Test", "Page");
       var lastModified          = new DateTime(2021, 12, 22);
 
-      topic.Attributes.SetValue("Subtitle", "Value");
+      topic.Attributes.SetValue("Title", "Value");
+      topic.Attributes.SetValue("ShortTitle", "Short Title");
+      topic.Attributes.SetValue("Subtitle", "Subtitle");
+      topic.Attributes.SetValue("MetaTitle", "Meta Title");
+      topic.Attributes.SetValue("MetaDescription", "Meta Description");
+      topic.Attributes.SetValue("MetaKeywords", "Load;Test;Keywords");
+      topic.Attributes.SetValue("NoIndex", "0");
+      topic.Attributes.SetValue("Body", "Body of test topic");
+      topic.Attributes.SetValue("MappedProperty", "Mapped Value");
+      topic.Attributes.SetValue("UnmappedProperty", "Unmapped Value");
       topic.VersionHistory.Add(lastModified);
 
-      var target                = await _mappingService.MapAsync<PageTopicViewModel>(topic).ConfigureAwait(false);
-
-      Assert.Equal("Test", target?.Title);
-      Assert.Equal("Value", target?.Subtitle);
+      var target                = await _mappingService.MapAsync<AttributeDictionaryConstructorTopicViewModel>(topic).ConfigureAwait(false);
+
+      Assert.Equal("Value", target?.Title);
+      Assert.Equal("Short Title", target?.ShortTitle);
+      Assert.Equal("Subtitle", target?.Subtitle);
+      Assert.Equal("Meta Title", target?.MetaTitle);
+      Assert.Equal("Meta Description", target?.MetaDescription);
+      Assert.Equal(false, target?.NoIndex);
+      Assert.Equal("Load;Test;Keywords", target?.MetaKeywords);
+      Assert.Equal("Mapped Value", target?.MappedProperty);
+      Assert.Null(target?.UnmappedProperty);
       Assert.Equal(lastModified, target?.LastModified);
 
     }

OnTopic.Tests/ViewModels/AttributeDictionaryConstructorTopicViewModel.cs

@@ -0,0 +1,48 @@
+/*==============================================================================================================================
+| Author        Ignia, LLC
+| Client        Ignia, LLC
+| Project       Topics Library
+\=============================================================================================================================*/
+
+using OnTopic.Attributes;
+
+namespace OnTopic.Tests.ViewModels {
+
+  /*============================================================================================================================
+  | VIEW MODEL: ATTRIBUTE DICTIONARY CONSTRUCTOR
+  \---------------------------------------------------------------------------------------------------------------------------*/
+  /// <summary>
+  ///   Provides a strongly-typed data transfer object for testing a constructor with a <see cref="AttributeDictionary"/>.
+  /// </summary>
+  /// <remarks>
+  ///   This is a sample class intended for test purposes only; it is not designed for use in a production environment.
+  /// </remarks>
+  public record AttributeDictionaryConstructorTopicViewModel: PageTopicViewModel {
+
+    /*==========================================================================================================================
+    | CONSTRUCTOR
+    \-------------------------------------------------------------------------------------------------------------------------*/
+    /// <summary>
+    ///   Initializes a new <see cref="AttributeDictionaryConstructorTopicViewModel"/> with an <paramref name="attributes"/>
+    ///   dictionary.
+    /// </summary>
+    /// <param name="attributes">An <see cref="AttributeDictionaryConstructorTopicViewModel"/> of attribute values.</param>
+    public AttributeDictionaryConstructorTopicViewModel(AttributeDictionary attributes) : base(attributes) {
+      Contract.Requires(attributes, nameof(attributes));
+      MappedProperty = attributes.GetValue(nameof(MappedProperty));
+    }
+
+    /// <summary>
+    ///   Initializes a new <see cref="AttributeDictionaryConstructorTopicViewModel"/> with no parameters.
+    /// </summary>
+    public AttributeDictionaryConstructorTopicViewModel() { }
+
+    /*==========================================================================================================================
+    | PROPERTIES
+    \-------------------------------------------------------------------------------------------------------------------------*/
+    public string? MappedProperty { get; init; }
+    public string? UnmappedProperty { get; init; }
+
+
+  } //Class
+} //Namespace