Add ObservableMilestoneClient int tests

Octokit.Tests.Integration/Octokit.Tests.Integration.csproj

@@ -61,6 +61,7 @@
     <Compile Include="IntegrationTestAttribute.cs" />
     <Compile Include="IssuesClientTests.cs" />
     <Compile Include="MiscellaneousClientTests.cs" />
+    <Compile Include="Reactive\ObservableMilestonesClientTests.cs" />
     <Compile Include="Reactive\ObservableRepositoriesClientTests.cs" />
     <Compile Include="ReleasesClientTests.cs" />
     <Compile Include="RepositoriesClientTests.cs" />

Octokit.Tests.Integration/Reactive/ObservableMilestonesClientTests.cs

@@ -0,0 +1,45 @@
+using System.Linq;
+using System.Net.Http.Headers;
+using System.Reactive.Linq;
+using System.Threading.Tasks;
+using Octokit.Reactive.Clients;
+using Xunit;
+
+namespace Octokit.Tests.Integration
+{
+    public class ObservableMilestonesClientTests
+    {
+        public class TheGetMethod
+        {
+            [IntegrationTest]
+            public async Task ReturnsSpecifiedMilestone()
+            {
+                var github = new GitHubClient(new ProductHeaderValue("OctokitTests"))
+                {
+                    Credentials = Helper.Credentials
+                };
+                var client = new ObservableMilestonesClient(github);
+                var observable = client.Get("libgit2", "libgit2sharp", 1);
+                var milestone = await observable;
+
+                Assert.Equal(1, milestone.Number);
+                Assert.Equal("v0.4.0", milestone.Title);
+                Assert.Equal(7, milestone.ClosedIssues);
+            }
+
+            [IntegrationTest]
+            public void ReturnsAllMilestones()
+            {
+                var github = new GitHubClient(new ProductHeaderValue("OctokitTests"))
+                {
+                    Credentials = Helper.Credentials
+                };
+                var client = new ObservableMilestonesClient(github);
+                var milestones = client.GetForRepository("libgit2", "libgit2sharp", new MilestoneRequest { State = ItemState.Closed }).ToList().Wait();
+
+                Assert.NotEmpty(milestones);
+                Assert.True(milestones.All(m => m.State == ItemState.Closed));
+            }
+        }
+    }
+}