test(abcip): read-only differential harness comparing native and libplctag on one target

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbCip/LibplctagTagRuntime.cs

@@ -53,6 +53,12 @@ internal sealed class LibplctagTagRuntime : IAbCipTagRuntime
     /// <inheritdoc />
     public int GetSize() => LibplctagStatusTranslation.WrapSync(() => _tag.GetSize());
 
+    /// <summary>
+    ///     A copy of the bytes of the last read, for the read-only differential harness (Task 18) to compare
+    ///     against the native runtime byte for byte. Not part of <see cref="IAbCipTagRuntime"/>.
+    /// </summary>
+    internal ReadOnlyMemory<byte> RawBuffer => LibplctagStatusTranslation.WrapSync(() => _tag.GetBuffer());
+
     /// <inheritdoc />
     public object? DecodeValue(AbCipDataType type, int? bitIndex) => DecodeValueAt(type, 0, bitIndex);
 

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbCip/NativeAbCipTagRuntime.cs

@@ -209,6 +209,12 @@ internal sealed class NativeAbCipTagRuntime : IAbCipTagRuntime
     /// <inheritdoc />
     public int GetSize() => _data.Length;
 
+    /// <summary>
+    ///     The bytes of the last read, for the read-only differential harness (Task 18) to compare against
+    ///     libplctag byte for byte. Not part of <see cref="IAbCipTagRuntime"/>.
+    /// </summary>
+    internal ReadOnlyMemory<byte> RawBuffer => _data;
+
     /// <inheritdoc />
     public object? DecodeValue(AbCipDataType type, int? bitIndex) => DecodeValueAt(type, 0, bitIndex);
 

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbCip/ZB.MOM.WW.OtOpcUa.Driver.AbCip.csproj

@@ -28,6 +28,7 @@
 
     <ItemGroup>
         <InternalsVisibleTo Include="ZB.MOM.WW.OtOpcUa.Driver.AbCip.Tests"/>
+        <InternalsVisibleTo Include="ZB.MOM.WW.OtOpcUa.Driver.AbCip.IntegrationTests"/>
     </ItemGroup>
 
 </Project>