diff --git a/Octokit.Reactive/Clients/ObservableRepositoryPagesClient.cs b/Octokit.Reactive/Clients/ObservableRepositoryPagesClient.cs
index 28d06ccc..16df2d91 100644
--- a/Octokit.Reactive/Clients/ObservableRepositoryPagesClient.cs
+++ b/Octokit.Reactive/Clients/ObservableRepositoryPagesClient.cs
@@ -7,9 +7,15 @@ namespace Octokit.Reactive
 {
     public class ObservableRepositoryPagesClient : IObservableRepositoryPagesClient
     {
+        private Func<object[], IGitHubClient> @for;
         readonly IRepositoryPagesClient _client;
         readonly IConnection _connection;
 
+        public ObservableRepositoryPagesClient(Func<object[], IGitHubClient> @for)
+        {
+            this.@for = @for;
+        }
+
         public ObservableRepositoryPagesClient(IGitHubClient client)
         {
             Ensure.ArgumentNotNull(client, "client");
diff --git a/Octokit.Tests.Integration/Clients/RepositoryPagesClientTests.cs b/Octokit.Tests.Integration/Clients/RepositoryPagesClientTests.cs
index 42137555..71e9a0b7 100644
--- a/Octokit.Tests.Integration/Clients/RepositoryPagesClientTests.cs
+++ b/Octokit.Tests.Integration/Clients/RepositoryPagesClientTests.cs
@@ -24,6 +24,7 @@ public class RepositoryPagesClientTests
             Assert.Equal("https://api.github.com/repos/octokit/octokit.net/pages", data.Url);
         }
     }
+
     public class TheGetAllMethod
     {
         readonly IRepositoryPagesClient _repositoryPagesClient;
diff --git a/Octokit.Tests/Clients/RepositoryPagesClientTests.cs b/Octokit.Tests/Clients/RepositoryPagesClientTests.cs
index 29932402..8c7a1f57 100644
--- a/Octokit.Tests/Clients/RepositoryPagesClientTests.cs
+++ b/Octokit.Tests/Clients/RepositoryPagesClientTests.cs
@@ -54,6 +54,16 @@ namespace Octokit.Tests.Clients
                 await Assert.ThrowsAsync<ArgumentNullException>(() => client.GetAll("owner", null, new ApiOptions()));
                 await Assert.ThrowsAsync<ArgumentNullException>(() => client.GetAll("owner", "name", null));
             }
+
+            [Fact]
+            public async Task EnsuresNonEmptyArguments()
+            {
+                var connection = Substitute.For<IApiConnection>();
+                var client = new RepositoryPagesClient(connection);
+
+                await Assert.ThrowsAsync<ArgumentException>(() => client.GetAll("", "name", new ApiOptions()));
+                await Assert.ThrowsAsync<ArgumentException>(() => client.GetAll("owner", "", new ApiOptions()));
+            }
         }
 
         public class TheGetLatestBuildMethod
diff --git a/Octokit.Tests/Octokit.Tests.csproj b/Octokit.Tests/Octokit.Tests.csproj
index 8aee294e..2051df68 100644
--- a/Octokit.Tests/Octokit.Tests.csproj
+++ b/Octokit.Tests/Octokit.Tests.csproj
@@ -216,6 +216,7 @@
     <Compile Include="Reactive\ObservablePullRequestReviewCommentsClientTests.cs" />
     <Compile Include="Reactive\ObservableRepositoriesClientTests.cs" />
     <Compile Include="Reactive\ObservableRepositoryCommitsClientTests.cs" />
+    <Compile Include="Reactive\ObservableRepositoryPagesClientTests.cs"/>
     <Compile Include="Reactive\ObservableRepositoryDeployKeysClientTests.cs" />
     <Compile Include="Reactive\ObservableGistsTests.cs" />
     <Compile Include="Reactive\ObservableStarredClientTests.cs" />
diff --git a/Octokit.Tests/Reactive/ObservableRepositoryPagesClientTests.cs b/Octokit.Tests/Reactive/ObservableRepositoryPagesClientTests.cs
new file mode 100644
index 00000000..133547cb
--- /dev/null
+++ b/Octokit.Tests/Reactive/ObservableRepositoryPagesClientTests.cs
@@ -0,0 +1,48 @@
+using System;
+using NSubstitute;
+using Octokit.Reactive;
+using Xunit;
+
+namespace Octokit.Tests.Reactive
+{
+    public class ObservableRepositoryPagesClientTests
+    {
+        public class TheGetAllMethod
+        {
+            [Fact]
+            public void RequestsCorrectUrl()
+            {
+                var githubClient = Substitute.For<IGitHubClient>();
+                var client = new ObservableRepositoryPagesClient(githubClient);
+                var options = new ApiOptions();
+
+                client.GetAll("fake", "repo", options);
+
+                githubClient.Repository.Page.Received().GetAll("fake", "repo", options);
+            }
+
+            [Fact]
+            public void EnsuresNonNullArguments()
+            {
+                var githubClient = Substitute.For<IGitHubClient>();
+                var client = new ObservableRepositoryPagesClient(githubClient);
+                var options = new ApiOptions();
+
+                Assert.Throws<ArgumentNullException>(() => client.GetAll(null, "repo", new ApiOptions()));
+                Assert.Throws<ArgumentNullException>(() => client.GetAll("owner", null, new ApiOptions()));
+                Assert.Throws<ArgumentNullException>(() => client.GetAll("owner", "repo", null));
+            }
+
+            [Fact]
+            public void EnsuresNonEmptyArguments()
+            {
+                var githubClient = Substitute.For<IGitHubClient>();
+                var client = new ObservableRepositoryPagesClient(githubClient);
+                var options = new ApiOptions();
+
+                Assert.Throws<ArgumentException>(() => client.GetAll("", "repo", new ApiOptions()));
+                Assert.Throws<ArgumentException>(() => client.GetAll("owner", "", new ApiOptions()));
+            }
+        }
+    }
+}