diff --git a/Octokit.Tests/Clients/StatisticsClientTests.cs b/Octokit.Tests/Clients/StatisticsClientTests.cs
new file mode 100644
index 00000000..1dae35c3
--- /dev/null
+++ b/Octokit.Tests/Clients/StatisticsClientTests.cs
@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using NSubstitute;
+using Octokit.Tests.Helpers;
+using Xunit;
+
+namespace Octokit.Tests.Clients
+{
+    public class StatisticsClientTests
+    {
+        public class TheConstructor
+        {
+            [Fact]
+            public void DoesThrowOnBadArguments()
+            {
+                Assert.Throws<ArgumentNullException>(() => new StatisticsClient(null));
+            }
+        }
+
+        public class TheGetContributorsMethod
+        {
+            [Fact]
+            public void RequestsCorrectUrl()
+            {
+                var expectedEndPoint = new Uri("/repos/username/repositoryName/stats/contributors", UriKind.Relative);
+
+                var connection = Substitute.For<IConnection>();
+                var client = Substitute.For<IApiConnection>();
+                client.Connection.Returns(connection);
+                var statisticsClient = new StatisticsClient(client);
+
+                statisticsClient.Contributors("username","repositoryName");
+
+                connection.Received().GetAsync<IList<Contributor>>(expectedEndPoint);
+            }
+
+            [Fact]
+            public async Task ThrowsIfGivenNullOwner()
+            {
+                var statisticsClient = new StatisticsClient(Substitute.For<IApiConnection>());
+                await AssertEx.Throws<ArgumentNullException>(() => statisticsClient.Contributors(null,"repositoryName"));
+            }
+
+            [Fact]
+            public async Task ThrowsIfGivenNullRepositoryName()
+            {
+                var statisticsClient = new StatisticsClient(Substitute.For<IApiConnection>());
+                await AssertEx.Throws<ArgumentNullException>(() => statisticsClient.Contributors("owner", null));
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/Octokit.Tests/Octokit.Tests.csproj b/Octokit.Tests/Octokit.Tests.csproj
index a558ecfa..05307427 100644
--- a/Octokit.Tests/Octokit.Tests.csproj
+++ b/Octokit.Tests/Octokit.Tests.csproj
@@ -75,6 +75,7 @@
     <Compile Include="Clients\AssigneesClientTests.cs" />
     <Compile Include="Clients\CommitsClientTests.cs" />
     <Compile Include="Clients\CommitStatusClientTests.cs" />
+    <Compile Include="Clients\StatisticsClientTests.cs" />
     <Compile Include="Clients\TeamsClientTests.cs" />
     <Compile Include="Clients\GitDatabaseClientTests.cs" />
     <Compile Include="Clients\OrganizationMembersClientTests.cs" />