Add a prototype telemetry setting test.

test/EndToEnd/OfficialBuilderTests.cs

@@ -0,0 +1,23 @@
+using System;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Xml.Linq;
+using FluentAssertions;
+using Microsoft.DotNet.TestFramework;
+using Microsoft.DotNet.Tools.Test.Utilities;
+using Xunit;
+
+namespace EndToEnd.Tests
+{
+    public class OfficialBuilderTests : TestBase
+    {
+        [Fact]
+        public void OfficialBuilderAtrribute()
+        {
+            var dotnetdir = Path.Combine(Path.GetDirectoryName(RepoDirectoriesProvider.DotnetUnderTest), "sdk", "7.0.100-dev");
+            var result = AssemblyInfo.Get(Path.Combine(dotnetdir, "dotnet.dll"), "AssemblyMetadataAttribute");
+            result.Should().Contain("OfficialBuilder:Microsoft");
+        }
+    }
+}