diff --git a/Octokit.Tests/Clients/PullRequestReviewCommentReactionsClientTests.cs b/Octokit.Tests/Clients/PullRequestReviewCommentReactionsClientTests.cs
new file mode 100644
index 00000000..669b3a94
--- /dev/null
+++ b/Octokit.Tests/Clients/PullRequestReviewCommentReactionsClientTests.cs
@@ -0,0 +1,62 @@
+using NSubstitute;
+using System;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace Octokit.Tests.Clients
+{
+    public class PullRequestReviewCommentReactionsClientTests
+    {
+        public class TheCtor
+        {
+            [Fact]
+            public void EnsuresNonNullArguments()
+            {
+                Assert.Throws<ArgumentNullException>(() => new PullRequestReviewCommentReactionsClient(null));
+            }
+        }
+
+        public class TheGetAllMethod
+        {
+            [Fact]
+            public async Task RequestsCorrectUrl()
+            {
+                var connection = Substitute.For<IApiConnection>();
+                var client = new ReactionsClient(connection);
+
+                client.PullRequestReviewComment.GetAll("fake", "repo", 42);
+
+                connection.Received().GetAll<Reaction>(Arg.Is<Uri>(u => u.ToString() == "repos/fake/repo/pulls/comments/1/reactions"), "application/vnd.github.squirrel-girl-preview");
+            }
+
+            [Fact]
+            public async Task EnsuresArgumentsNotNull()
+            {
+                var connection = Substitute.For<IApiConnection>();
+                var client = new ReactionsClient(connection);
+
+                await Assert.ThrowsAsync<ArgumentNullException>(() => client.PullRequestReviewComment.Create(null, "name", 1, new NewReaction(ReactionType.Heart)));
+                await Assert.ThrowsAsync<ArgumentException>(() => client.PullRequestReviewComment.Create("", "name", 1, new NewReaction(ReactionType.Heart)));
+                await Assert.ThrowsAsync<ArgumentNullException>(() => client.PullRequestReviewComment.Create("owner", null, 1, new NewReaction(ReactionType.Heart)));
+                await Assert.ThrowsAsync<ArgumentException>(() => client.PullRequestReviewComment.Create("owner", "", 1, new NewReaction(ReactionType.Heart)));
+                await Assert.ThrowsAsync<ArgumentException>(() => client.PullRequestReviewComment.Create("owner", "name", 1, null));
+            }
+        }
+
+        public class TheCreateMethod
+        {
+            [Fact]
+            public void RequestsCorrectUrl()
+            {
+                NewReaction newReaction = new NewReaction(ReactionType.Heart);
+
+                var connection = Substitute.For<IApiConnection>();
+                var client = new ReactionsClient(connection);
+
+                client.PullRequestReviewComment.Create("fake", "repo", 1, newReaction);
+
+                connection.Received().Post<Reaction>(Arg.Is<Uri>(u => u.ToString() == "repos/fake/repo/pulls/comments/1/reactions"), Arg.Any<object>(), "application/vnd.github.squirrel-girl-preview");
+            }
+        }
+    }
+}
diff --git a/Octokit.Tests/Octokit.Tests.csproj b/Octokit.Tests/Octokit.Tests.csproj
index 05562f78..058d15a0 100644
--- a/Octokit.Tests/Octokit.Tests.csproj
+++ b/Octokit.Tests/Octokit.Tests.csproj
@@ -96,6 +96,7 @@
     <Compile Include="Clients\Enterprise\EnterpriseSearchIndexingClientTests.cs" />
     <Compile Include="Clients\MergingClientTests.cs" />
     <Compile Include="Clients\OauthClientTests.cs" />
+    <Compile Include="Clients\PullRequestReviewCommentReactionsClientTests.cs" />
     <Compile Include="Clients\RepositoryCommentsClientTests.cs" />
     <Compile Include="Clients\DeploymentsClientTests.cs" />
     <Compile Include="Clients\DeploymentStatusClientTests.cs" />
@@ -212,6 +213,7 @@
     <Compile Include="Reactive\ObservableCommitCommentReactionClientTests.cs" />
     <Compile Include="Reactive\ObservableCommitsClientTests.cs" />
     <Compile Include="Reactive\ObservableIssuesLabelsClientTests.cs" />
+    <Compile Include="Reactive\ObservablePullRequestReviewCommentReactionsClientTests.cs" />
     <Compile Include="Reactive\ObservableRepoCollaboratorsClientTests.cs" />
     <Compile Include="Reactive\ObservableDeploymentsClientTests.cs" />
     <Compile Include="Reactive\ObservableDeploymentStatusClientTests.cs" />
diff --git a/Octokit.Tests/Reactive/ObservableCommitCommentReactionClientTests.cs b/Octokit.Tests/Reactive/ObservableCommitCommentReactionClientTests.cs
index cd23ef15..794dae4e 100644
--- a/Octokit.Tests/Reactive/ObservableCommitCommentReactionClientTests.cs
+++ b/Octokit.Tests/Reactive/ObservableCommitCommentReactionClientTests.cs
@@ -31,11 +31,11 @@ namespace Octokit.Tests.Reactive
             public void EnsuresArgumentsNotNull()
             {
 
-                Assert.Throws<ArgumentNullException>(() => _client.CommitComment.CreateReaction(null, "name", 1, new NewReaction(ReactionType.Heart)));
-                Assert.Throws<ArgumentException>(() => _client.CommitComment.CreateReaction("", "name", 1, new NewReaction(ReactionType.Heart)));
-                Assert.Throws<ArgumentNullException>(() => _client.CommitComment.CreateReaction("owner", null, 1, new NewReaction(ReactionType.Heart)));
-                Assert.Throws<ArgumentException>(() => _client.CommitComment.CreateReaction("owner", "", 1, new NewReaction(ReactionType.Heart)));
-                Assert.Throws<ArgumentException>(() => _client.CommitComment.CreateReaction("owner", "name", 1, null));
+                Assert.Throws<ArgumentNullException>(() => _client.CommitComment.Create(null, "name", 1, new NewReaction(ReactionType.Heart)));
+                Assert.Throws<ArgumentException>(() => _client.CommitComment.Create("", "name", 1, new NewReaction(ReactionType.Heart)));
+                Assert.Throws<ArgumentNullException>(() => _client.CommitComment.Create("owner", null, 1, new NewReaction(ReactionType.Heart)));
+                Assert.Throws<ArgumentException>(() => _client.CommitComment.Create("owner", "", 1, new NewReaction(ReactionType.Heart)));
+                Assert.Throws<ArgumentException>(() => _client.CommitComment.Create("owner", "name", 1, null));
             }
         }
 
@@ -48,8 +48,8 @@ namespace Octokit.Tests.Reactive
                 var client = new ObservableReactionsClient(githubClient);
                 var newReaction = new NewReaction(ReactionType.Confused);
 
-                client.CommitComment.CreateReaction("fake", "repo", 1, newReaction);
-                githubClient.Received().Reaction.CommitComment.CreateReaction("fake", "repo", 1, newReaction);
+                client.CommitComment.Create("fake", "repo", 1, newReaction);
+                githubClient.Received().Reaction.CommitComment.Create("fake", "repo", 1, newReaction);
             }
         }
     }
diff --git a/Octokit.Tests/Reactive/ObservablePullRequestReviewCommentReactionsClientTests.cs b/Octokit.Tests/Reactive/ObservablePullRequestReviewCommentReactionsClientTests.cs
new file mode 100644
index 00000000..cd85f612
--- /dev/null
+++ b/Octokit.Tests/Reactive/ObservablePullRequestReviewCommentReactionsClientTests.cs
@@ -0,0 +1,56 @@
+using NSubstitute;
+using Octokit.Reactive;
+using System;
+using Xunit;
+
+namespace Octokit.Tests.Reactive
+{
+    public class ObservablePullRequestReviewCommentReactionsClientTests
+    {
+        public class TheGetAllMethod
+        {
+            private readonly IGitHubClient _githubClient;
+            private readonly IObservableReactionsClient _client;
+            private const string owner = "owner";
+            private const string name = "name";
+
+            public TheGetAllMethod()
+            {
+                _githubClient = Substitute.For<IGitHubClient>();
+                _client = new ObservableReactionsClient(_githubClient);
+            }
+
+            [Fact]
+            public void RequestsCorrectUrl()
+            {
+                _client.PullRequestReviewComment.GetAll("fake", "repo", 42);
+                _githubClient.Received().Reaction.PullRequestReviewComment.GetAll("fake", "repo", 42);
+            }
+
+            [Fact]
+            public void EnsuresArgumentsNotNull()
+            {
+
+                Assert.Throws<ArgumentNullException>(() => _client.PullRequestReviewComment.Create(null, "name", 1, new NewReaction(ReactionType.Heart)));
+                Assert.Throws<ArgumentException>(() => _client.PullRequestReviewComment.Create("", "name", 1, new NewReaction(ReactionType.Heart)));
+                Assert.Throws<ArgumentNullException>(() => _client.PullRequestReviewComment.Create("owner", null, 1, new NewReaction(ReactionType.Heart)));
+                Assert.Throws<ArgumentException>(() => _client.PullRequestReviewComment.Create("owner", "", 1, new NewReaction(ReactionType.Heart)));
+                Assert.Throws<ArgumentException>(() => _client.PullRequestReviewComment.Create("owner", "name", 1, null));
+            }
+        }
+
+        public class TheCreateMethod
+        {
+            [Fact]
+            public void RequestsCorrectUrl()
+            {
+                var githubClient = Substitute.For<IGitHubClient>();
+                var client = new ObservableReactionsClient(githubClient);
+                var newReaction = new NewReaction(ReactionType.Confused);
+
+                client.PullRequestReviewComment.Create("fake", "repo", 1, newReaction);
+                githubClient.Received().Reaction.PullRequestReviewComment.Create("fake", "repo", 1, newReaction);
+            }
+        }
+    }
+}