diff --git a/Octokit.Reactive/Clients/ObservablePullRequestReviewCommentReactionsClient.cs b/Octokit.Reactive/Clients/ObservablePullRequestReviewCommentReactionsClient.cs
index 331b721d..e917ef5a 100644
--- a/Octokit.Reactive/Clients/ObservablePullRequestReviewCommentReactionsClient.cs
+++ b/Octokit.Reactive/Clients/ObservablePullRequestReviewCommentReactionsClient.cs
@@ -5,7 +5,7 @@ using System.Reactive.Threading.Tasks;
 
 namespace Octokit.Reactive
 {
-    class ObservablePullRequestReviewCommentReactionsClient : IObservablePullRequestReviewCommentReactionsClient
+    public class ObservablePullRequestReviewCommentReactionsClient : IObservablePullRequestReviewCommentReactionsClient
     {
         readonly IPullRequestReviewCommentReactionsClient _client;
         readonly IConnection _connection;
diff --git a/Octokit.Tests/Reactive/ObservableCommitCommentReactionClientTests.cs b/Octokit.Tests/Reactive/ObservableCommitCommentReactionClientTests.cs
index 2daf811f..6b22a6c6 100644
--- a/Octokit.Tests/Reactive/ObservableCommitCommentReactionClientTests.cs
+++ b/Octokit.Tests/Reactive/ObservableCommitCommentReactionClientTests.cs
@@ -7,6 +7,15 @@ namespace Octokit.Tests.Reactive
 {
     public class ObservableCommitCommentReactionClientTests
     {
+        public class TheCtor
+        {
+            [Fact]
+            public void EnsuresNonNullArguments()
+            {
+                Assert.Throws<ArgumentNullException>(() => new ObservableCommitCommentReactionsClient(null));
+            }
+        }
+
         public class TheGetAllMethod
         {
             private readonly IGitHubClient _githubClient;
diff --git a/Octokit.Tests/Reactive/ObservablePullRequestReviewCommentReactionsClientTests.cs b/Octokit.Tests/Reactive/ObservablePullRequestReviewCommentReactionsClientTests.cs
index 65c0c369..f0037c4a 100644
--- a/Octokit.Tests/Reactive/ObservablePullRequestReviewCommentReactionsClientTests.cs
+++ b/Octokit.Tests/Reactive/ObservablePullRequestReviewCommentReactionsClientTests.cs
@@ -7,6 +7,16 @@ namespace Octokit.Tests.Reactive
 {
     public class ObservablePullRequestReviewCommentReactionsClientTests
     {
+
+        public class TheCtor
+        {
+            [Fact]
+            public void EnsuresNonNullArguments()
+            {
+                Assert.Throws<ArgumentNullException>(() => new ObservablePullRequestReviewCommentReactionsClient(null));
+            }
+        }
+
         public class TheGetAllMethod
         {
             private readonly IGitHubClient _githubClient;