🎨 Refactor MockHttpClient out of ProjectTest, and use it

Blockmason.Link.Tests/MockHttpClient.cs

@@ -0,0 +1,13 @@
+using System.Net.Http;
+using System.Threading.Tasks;
+
+namespace Blockmason.Link.Tests {
+  public class MockHttpClient : HttpClient {
+    public MockHttpClient() : base() {
+    }
+
+    public Task<HttpResponseMessage> SendAsync(HttpRequestMessage request) {
+      return new HttpResponseMessage();
+    }
+  }
+}

Blockmason.Link.Tests/ProjectTest.cs

@@ -1,24 +1,15 @@
 using Xunit;
 using Blockmason.Link;
-using Blockmason.Link.OAuth;
-using System.Collections.Generic;
+using Blockmason.Link.OAuth2;
 using System.Net.Http;
+using System.Threading.Tasks;
 
 namespace Blockmason.Link.Tests {
   public class ProjectTest {
-    internal class MockHttpClient : HttpClient {
-      public MockHttpClient() : base() {
-      }
-
-      public Task<HttpResponseMessage> SendAsync(HttpRequestMessage request) {
-        return new HttpResponseMessage();
-      }
-    }
-
     [Fact]
     public async void CanBeConstructed() {
       Credential credential = new Credential();
-      HttpClient httpClient = new HttpClient();
+      HttpClient httpClient = new MockHttpClient();
       string baseURL = "https://localhost:9000/not-a-live-server-dont-worry";
       Session session = new Session(httpClient, credential, baseURL);
       Project project = new Project(session);