Fix unit tests

Octokit.Reactive/Clients/Enterprise/IObservableEnterpriseAdminStatsClient.cs

@@ -1,4 +1,5 @@
-using System;
+using Octokit;
+using System;
 using System.Diagnostics.CodeAnalysis;
 
 namespace Octokit.Reactive

Octokit.Tests.Integration/Clients/CommitCommentReactionsClientTests.cs

@@ -63,7 +63,7 @@ public class CommitCommentReactionsClientTests
 
             Assert.Equal(ReactionType.Confused, reaction.Content);
 
-            Assert.Equal(result.User.Id, reaction.UserId);
+            Assert.Equal(result.User.Id, reaction.User.Id);
         }
 
         public void Dispose()

Octokit.Tests.Integration/Clients/IssueCommentReactionsClientTests.cs

@@ -41,7 +41,7 @@ public class IssueCommentReactionsClientTests
 
             Assert.Equal(ReactionType.Heart, issueCommentReaction.Content);
 
-            Assert.Equal(issueComment.User.Id, issueCommentReaction.UserId);
+            Assert.Equal(issueComment.User.Id, issueCommentReaction.User.Id);
         }
 
         public void Dispose()

Octokit.Tests.Integration/Clients/IssueReactionsClientTests.cs

@@ -37,7 +37,7 @@ public class IssueReactionsClientTests
 
             Assert.Equal(ReactionType.Heart, issueReaction.Content);
 
-            Assert.Equal(issue.User.Id, issueReaction.UserId);
+            Assert.Equal(issue.User.Id, issueReaction.User.Id);
         }
 
         public void Dispose()

Octokit.Tests.Integration/Clients/PullRequestReviewCommentReactionsClientTests.cs

@@ -47,7 +47,7 @@ public class PullRequestReviewCommentReactionsClientTests
 
         Assert.Equal(ReactionType.Heart, pullRequestReviewCommentReaction.Content);
 
-        Assert.Equal(commentFromGitHub.User.Id, pullRequestReviewCommentReaction.UserId);
+        Assert.Equal(commentFromGitHub.User.Id, pullRequestReviewCommentReaction.User.Id);
     }
 
     /// <summary>