Added intergration tests for contributors api

Octokit.Tests.Integration/Clients/StatisticsClientTests.cs

@@ -0,0 +1,66 @@
+using System.Net.Http.Headers;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace Octokit.Tests.Integration.Clients
+{
+    public class StatisticsClientTests
+    {
+        public class TheContributorStatistics
+        {
+            readonly IGitHubClient _client;
+            readonly Repository _repository;
+            readonly ICommitsClient _fixture;
+            readonly string _owner;
+            readonly string _repoName;
+
+            public TheContributorStatistics()
+            {
+                _client = new GitHubClient(new ProductHeaderValue("OctokitTests"))
+                {
+                    Credentials = Helper.Credentials
+                };
+
+                _repoName = Helper.MakeNameWithTimestamp("public-repo");
+                _fixture = _client.GitDatabase.Commit;
+                _repository = _client.Repository.Create(new NewRepository { Name = _repoName, AutoInit = true }).Result;
+                _owner = _repository.Owner.Login;
+            }
+
+
+            [IntegrationTest]
+            public async Task CanCreateAndRetrieveCommit()
+            {
+                await SeedRepository();
+                var contributors = await _client.Statistics.GetContributors(_owner, _repoName);
+                Assert.NotNull(contributors);
+            }
+
+            async Task<Commit> SeedRepository()
+            {
+                var blob = new NewBlob
+                {
+                    Content = "Hello World!",
+                    Encoding = EncodingType.Utf8
+                };
+                var blobResult = await _client.GitDatabase.Blob.Create(_owner, _repository.Name, blob);
+
+                var newTree = new NewTree();
+                newTree.Tree.Add(new NewTreeItem
+                {
+                    Type = TreeType.Blob,
+                    Mode = FileMode.File,
+                    Path = "README.md",
+                    Sha = blobResult.Sha
+                });
+
+                var treeResult = await _client.GitDatabase.Tree.Create(_owner, _repository.Name, newTree);
+
+                var newCommit = new NewCommit("test-commit", treeResult.Sha);
+
+                var commit = await _fixture.Create(_owner, _repository.Name, newCommit);
+                return commit;
+            }
+        }
+    }
+}