Moving some more optimization tests.

Ix.NET/Source/System.Interactive.Async.Tests/AppendPrependTests.cs

@@ -11,168 +11,6 @@ namespace Tests
 {
     public partial class AsyncTests
     {
-        [Fact]
-        public void AppendPrepend1()
-        {
-            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
 
-            var res = xs.Prepend(4)
-                        .Append(5)
-                        .Append(6)
-                        .Prepend(7)
-                        .Append(8)
-                        .Prepend(9)
-                        .Prepend(10);
-
-            var e = res.GetAsyncEnumerator();
-
-            HasNext(e, 10);
-            HasNext(e, 9);
-            HasNext(e, 7);
-            HasNext(e, 4);
-            HasNext(e, 1);
-            HasNext(e, 2);
-            HasNext(e, 3);
-            HasNext(e, 5);
-            HasNext(e, 6);
-            HasNext(e, 8);
-            NoNext(e);
-        }
-
-        [Fact]
-        public async Task AppendPrepend2()
-        {
-            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
-
-            var res = xs.Prepend(4)
-                        .Append(5)
-                        .Append(6)
-                        .Prepend(7)
-                        .Append(8)
-                        .Prepend(9)
-                        .Prepend(10);
-
-            var a = new[] { 10, 9, 7, 4, 1, 2, 3, 5, 6, 8 };
-
-            var arr = await res.ToArray();
-            Assert.Equal(a, arr);
-        }
-
-        [Fact]
-        public async Task AppendPrepend3()
-        {
-            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
-            var res = xs.Prepend(4)
-                        .Append(5)
-                        .Append(6)
-                        .Prepend(7)
-                        .Append(8)
-                        .Prepend(9)
-                        .Prepend(10);
-
-            var a = new List<int> { 10, 9, 7, 4, 1, 2, 3, 5, 6, 8 };
-
-            var arr = await res.ToList();
-            Assert.Equal(a, arr);
-        }
-
-        [Fact]
-        public async Task AppendPrepend4()
-        {
-            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
-
-            var res = xs.Prepend(4)
-                        .Append(5)
-                        .Append(6)
-                        .Prepend(7)
-                        .Append(8)
-                        .Prepend(9)
-                        .Prepend(10);
-
-            Assert.Equal(10, await res.Count());
-        }
-
-        [Fact]
-        public async Task AppendPrepend5()
-        {
-            var xs = AsyncEnumerable.Range(1, 3).Where(i => true);
-
-            var res = xs.Prepend(4)
-                        .Append(5)
-                        .Append(6)
-                        .Prepend(7)
-                        .Append(8)
-                        .Prepend(9)
-                        .Prepend(10);
-
-            var a = new[] { 10, 9, 7, 4, 1, 2, 3, 5, 6, 8 };
-
-            var arr = await res.ToArray();
-            Assert.Equal(a, arr);
-        }
-
-        [Fact]
-        public async Task AppendPrepend6()
-        {
-            var xs = AsyncEnumerable.Range(1, 3).Where(i => true);
-
-            var res = xs.Prepend(4)
-                        .Append(5)
-                        .Append(6)
-                        .Prepend(7)
-                        .Append(8)
-                        .Prepend(9)
-                        .Prepend(10);
-
-            var a = new List<int> { 10, 9, 7, 4, 1, 2, 3, 5, 6, 8 };
-
-            var arr = await res.ToList();
-            Assert.Equal(a, arr);
-        }
-
-        [Fact]
-        public async Task AppendPrepend7()
-        {
-            var xs = AsyncEnumerable.Range(1, 3).Where(i => true);
-
-            var res = xs.Prepend(4)
-                        .Append(5)
-                        .Append(6)
-                        .Prepend(7)
-                        .Append(8)
-                        .Prepend(9)
-                        .Prepend(10);
-
-            Assert.Equal(10, await res.Count());
-        }
-
-        [Fact]
-        public void AppendPrepend8()
-        {
-            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
-
-            var res = xs.Append(4)
-                        .Prepend(5);
-
-            var e = res.GetAsyncEnumerator();
-
-            HasNext(e, 5);
-            HasNext(e, 1);
-            HasNext(e, 2);
-            HasNext(e, 3);
-            HasNext(e, 4);
-            NoNext(e);
-        }
-
-        [Fact]
-        public async Task AppendPrepend9()
-        {
-            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
-
-            var res = xs.Append(4)
-                        .Prepend(5);
-
-            await SequenceIdentity(res);
-        }
     }
 }

Ix.NET/Source/System.Linq.Async.Tests/System/Linq/Optimizations.cs

@@ -2,7 +2,9 @@
 // The .NET Foundation licenses this file to you under the Apache 2.0 License.
 // See the LICENSE file in the project root for more information. 
 
+using System.Collections.Generic;
 using System.Linq;
+using System.Threading.Tasks;
 using Xunit;
 
 namespace Tests
@@ -44,5 +46,169 @@ namespace Tests
             HasNext(e, 6);
             NoNext(e);
         }
+
+        [Fact]
+        public void AppendPrepend1()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+
+            var res = xs.Prepend(4)
+                        .Append(5)
+                        .Append(6)
+                        .Prepend(7)
+                        .Append(8)
+                        .Prepend(9)
+                        .Prepend(10);
+
+            var e = res.GetAsyncEnumerator();
+
+            HasNext(e, 10);
+            HasNext(e, 9);
+            HasNext(e, 7);
+            HasNext(e, 4);
+            HasNext(e, 1);
+            HasNext(e, 2);
+            HasNext(e, 3);
+            HasNext(e, 5);
+            HasNext(e, 6);
+            HasNext(e, 8);
+            NoNext(e);
+        }
+
+        [Fact]
+        public async Task AppendPrepend2()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+
+            var res = xs.Prepend(4)
+                        .Append(5)
+                        .Append(6)
+                        .Prepend(7)
+                        .Append(8)
+                        .Prepend(9)
+                        .Prepend(10);
+
+            var a = new[] { 10, 9, 7, 4, 1, 2, 3, 5, 6, 8 };
+
+            var arr = await res.ToArray();
+            Assert.Equal(a, arr);
+        }
+
+        [Fact]
+        public async Task AppendPrepend3()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+            var res = xs.Prepend(4)
+                        .Append(5)
+                        .Append(6)
+                        .Prepend(7)
+                        .Append(8)
+                        .Prepend(9)
+                        .Prepend(10);
+
+            var a = new List<int> { 10, 9, 7, 4, 1, 2, 3, 5, 6, 8 };
+
+            var arr = await res.ToList();
+            Assert.Equal(a, arr);
+        }
+
+        [Fact]
+        public async Task AppendPrepend4()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+
+            var res = xs.Prepend(4)
+                        .Append(5)
+                        .Append(6)
+                        .Prepend(7)
+                        .Append(8)
+                        .Prepend(9)
+                        .Prepend(10);
+
+            Assert.Equal(10, await res.Count());
+        }
+
+        [Fact]
+        public async Task AppendPrepend5()
+        {
+            var xs = AsyncEnumerable.Range(1, 3).Where(i => true);
+
+            var res = xs.Prepend(4)
+                        .Append(5)
+                        .Append(6)
+                        .Prepend(7)
+                        .Append(8)
+                        .Prepend(9)
+                        .Prepend(10);
+
+            var a = new[] { 10, 9, 7, 4, 1, 2, 3, 5, 6, 8 };
+
+            var arr = await res.ToArray();
+            Assert.Equal(a, arr);
+        }
+
+        [Fact]
+        public async Task AppendPrepend6()
+        {
+            var xs = AsyncEnumerable.Range(1, 3).Where(i => true);
+
+            var res = xs.Prepend(4)
+                        .Append(5)
+                        .Append(6)
+                        .Prepend(7)
+                        .Append(8)
+                        .Prepend(9)
+                        .Prepend(10);
+
+            var a = new List<int> { 10, 9, 7, 4, 1, 2, 3, 5, 6, 8 };
+
+            var arr = await res.ToList();
+            Assert.Equal(a, arr);
+        }
+
+        [Fact]
+        public async Task AppendPrepend7()
+        {
+            var xs = AsyncEnumerable.Range(1, 3).Where(i => true);
+
+            var res = xs.Prepend(4)
+                        .Append(5)
+                        .Append(6)
+                        .Prepend(7)
+                        .Append(8)
+                        .Prepend(9)
+                        .Prepend(10);
+
+            Assert.Equal(10, await res.Count());
+        }
+
+        [Fact]
+        public void AppendPrepend8()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+
+            var res = xs.Append(4)
+                        .Prepend(5);
+
+            var e = res.GetAsyncEnumerator();
+
+            HasNext(e, 5);
+            HasNext(e, 1);
+            HasNext(e, 2);
+            HasNext(e, 3);
+            HasNext(e, 4);
+            NoNext(e);
+        }
+
+        [Fact]
+        public async Task AppendPrepend9()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+
+            var res = xs.Append(4)
+                        .Prepend(5);
+
+            await SequenceIdentity(res);
+        }
     }
 }