Expand XML docs across bridge and test code

tests/ZB.MOM.WW.LmxOpcUa.Tests/Domain/GalaxyAttributeInfoTests.cs

@@ -4,8 +4,14 @@ using ZB.MOM.WW.LmxOpcUa.Host.Domain;
 
 namespace ZB.MOM.WW.LmxOpcUa.Tests.Domain
 {
+    /// <summary>
+    /// Verifies default and extended-field behavior for Galaxy attribute metadata objects.
+    /// </summary>
     public class GalaxyAttributeInfoTests
     {
+        /// <summary>
+        /// Confirms that a default attribute metadata object starts with empty strings for its text fields.
+        /// </summary>
         [Fact]
         public void DefaultValues_AreEmpty()
         {
@@ -18,6 +24,9 @@ namespace ZB.MOM.WW.LmxOpcUa.Tests.Domain
             info.DataTypeName.ShouldBe("");
         }
 
+        /// <summary>
+        /// Confirms that primitive-name and attribute-source fields can be populated for extended metadata rows.
+        /// </summary>
         [Fact]
         public void ExtendedFields_CanBeSet()
         {
@@ -30,6 +39,9 @@ namespace ZB.MOM.WW.LmxOpcUa.Tests.Domain
             info.AttributeSource.ShouldBe("primitive");
         }
 
+        /// <summary>
+        /// Confirms that standard attribute rows leave the extended metadata fields empty.
+        /// </summary>
         [Fact]
         public void StandardAttributes_HaveEmptyExtendedFields()
         {