Add failing test for exceptions in SequentialListSource.

Author: grokys

test/GitHub.App.UnitTests/Collections/SequentialListSourceTests.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using GitHub.Collections;
@@ -34,6 +35,17 @@ public async Task GetPage_Should_Load_Pages()
             Assert.That(target.PagesLoaded, Is.EqualTo(new[] { 0, 1, 2, 3 }));
         }
 
+        [Test]
+        public void GetPage_Should_Stop_Loading_Pages_When_LoadPage_Throws()
+        {
+            var target = new TestSource(2);
+
+            Assert.That(target.PagesLoaded, Is.Empty);
+
+            Assert.ThrowsAsync<AggregateException>(() => target.GetPage(3));
+            Assert.That(target.PagesLoaded, Is.EqualTo(new[] { 0, 1 }));
+        }
+
         class TestSource : SequentialListSource<string, string>
         {
             const int PageCount = 10;

test/GitHub.App.UnitTests/GitHub.App.UnitTests.csproj

@@ -157,6 +157,7 @@
     <Compile Include="..\Helpers\TestSharedCache.cs" />
     <Compile Include="Args.cs" />
     <Compile Include="Caches\ImageCacheTests.cs" />
+    <Compile Include="Collections\SequentialListSourceTests.cs" />
     <Compile Include="Factories\ModelServiceFactoryTests.cs" />
     <Compile Include="Models\AccountModelTests.cs" />
     <Compile Include="Models\ModelServiceTests.cs" />