Moving Append and Prepend tests.

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

@@ -12,460 +12,6 @@ namespace Tests
 {
     public partial class AsyncTests
     {
-
-        [Fact]
-        public void AppendPrepend_Null()
-        {
-            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Append(null, 42));
-            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Prepend(null, 42));
-        }
-
-        [Fact]
-        public void Append1()
-        {
-            var xs = new[] {1, 2, 3}.ToAsyncEnumerable();
-
-            var res = xs.Append(4);
-
-            var e = res.GetAsyncEnumerator();
-
-            HasNext(e, 1);
-            HasNext(e, 2);
-            HasNext(e, 3);
-            HasNext(e, 4);
-            NoNext(e);
-        }
-
-        [Fact]
-        public async Task Append2()
-        {
-            var xs = new[] {1, 2, 3}.ToAsyncEnumerable();
-
-            var res = xs.Append(4);
-
-            var a = new[] {1, 2, 3, 4};
-
-            var arr = await res.ToArray();
-            Assert.Equal(a, arr);
-        }
-
-        [Fact]
-        public async Task Append3()
-        {
-            var xs = new[] {1, 2, 3}.ToAsyncEnumerable();
-            var res = xs.Append(4);
-            var a = new List<int>
-            {
-                1,
-                2,
-                3,
-                4
-            };
-            var arr = await res.ToList();
-            Assert.Equal(a, arr);
-        }
-
-        [Fact]
-        public async Task Append4()
-        {
-            var xs = new[] {1, 2, 3}.ToAsyncEnumerable();
-
-            var res = xs.Append(4);
-            Assert.Equal(4, await res.Count());
-        }
-
-        [Fact]
-        public async Task Append5()
-        {
-            var xs = AsyncEnumerable.Range(1, 3)
-                                    .Where(i => true);
-
-            var res = xs.Append(4);
-
-            var a = new[] {1, 2, 3, 4};
-
-            var arr = await res.ToArray();
-            Assert.Equal(a, arr);
-        }
-
-        [Fact]
-        public async Task Append6()
-        {
-            var xs = AsyncEnumerable.Range(1, 3)
-                                    .Where(i => true);
-
-            var res = xs.Append(4);
-            Assert.Equal(4, await res.Count());
-        }
-
-        [Fact]
-        public async Task Append7()
-        {
-            var xs = AsyncEnumerable.Range(1, 3)
-                                    .Where(i => true);
-            var res = xs.Append(4);
-            var a = new List<int>
-            {
-                1,
-                2,
-                3,
-                4
-            };
-            var arr = await res.ToList();
-            Assert.Equal(a, arr);
-        }
-
-
-        [Fact]
-        public void AppendN1()
-        {
-            var xs = new[] {1, 2, 3}.ToAsyncEnumerable();
-
-            var res = xs.Append(4)
-                        .Append(5)
-                        .Append(6);
-
-            var e = res.GetAsyncEnumerator();
-
-            HasNext(e, 1);
-            HasNext(e, 2);
-            HasNext(e, 3);
-            HasNext(e, 4);
-            HasNext(e, 5);
-            HasNext(e, 6);
-            NoNext(e);
-        }
-
-        [Fact]
-        public async Task AppendN2()
-        {
-            var xs = new[] {1, 2, 3}.ToAsyncEnumerable();
-
-            var res = xs.Append(4)
-                        .Append(5)
-                        .Append(6);
-
-            var a = new[] {1, 2, 3, 4, 5, 6};
-
-            var arr = await res.ToArray();
-            Assert.Equal(a, arr);
-        }
-
-        [Fact]
-        public async Task AppendN3()
-        {
-            var xs = new[] {1, 2, 3}.ToAsyncEnumerable();
-            var res = xs.Append(4)
-                        .Append(5)
-                        .Append(6);
-
-            var a = new List<int>
-            {
-                1,
-                2,
-                3,
-                4,
-                5,
-                6
-            };
-
-            var arr = await res.ToList();
-            Assert.Equal(a, arr);
-        }
-
-
-        [Fact]
-        public async Task AppendN5()
-        {
-            var xs = AsyncEnumerable.Range(1, 3)
-                                    .Where(i => true);
-
-            var res = xs.Append(4)
-                        .Append(5)
-                        .Append(6);
-
-            var a = new[] {1, 2, 3, 4, 5, 6};
-
-            var arr = await res.ToArray();
-            Assert.Equal(a, arr);
-        }
-
-        [Fact]
-        public async Task AppendN6()
-        {
-            var xs = AsyncEnumerable.Range(1, 3)
-                                    .Where(i => true);
-            var res = xs.Append(4)
-                        .Append(5)
-                        .Append(6);
-
-            var a = new List<int>
-            {
-                1,
-                2,
-                3,
-                4,
-                5,
-                6
-            };
-
-            var arr = await res.ToList();
-            Assert.Equal(a, arr);
-        }
-
-        [Fact]
-        public async Task AppendN7()
-        {
-            var xs = AsyncEnumerable.Range(1, 3)
-                                    .Where(i => true);
-
-            var res = xs.Append(4)
-                        .Append(5)
-                        .Append(6);
-            Assert.Equal(6, await res.Count());
-        }
-
-        [Fact]
-        public async Task AppenN4()
-        {
-            var xs = new[] {1, 2, 3}.ToAsyncEnumerable();
-
-            var res = xs.Append(4)
-                        .Append(5)
-                        .Append(6);
-            Assert.Equal(6, await res.Count());
-        }
-
-        [Fact]
-        public void Prepend1()
-        {
-            var xs = new[] {1, 2, 3}.ToAsyncEnumerable();
-
-            var res = xs.Prepend(4);
-
-            var e = res.GetAsyncEnumerator();
-
-            HasNext(e, 4);
-            HasNext(e, 1);
-            HasNext(e, 2);
-            HasNext(e, 3);
-            NoNext(e);
-        }
-
-        [Fact]
-        public async Task Prepend2()
-        {
-            var xs = new[] {1, 2, 3}.ToAsyncEnumerable();
-
-            var res = xs.Prepend(4);
-
-            var a = new[] {4, 1, 2, 3};
-
-            var arr = await res.ToArray();
-            Assert.Equal(a, arr);
-        }
-
-        [Fact]
-        public async Task Prepend3()
-        {
-            var xs = new[] {1, 2, 3}.ToAsyncEnumerable();
-            var res = xs.Prepend(4);
-            var a = new List<int>
-            {
-                4,
-                1,
-                2,
-                3
-            };
-            var arr = await res.ToList();
-            Assert.Equal(a, arr);
-        }
-
-
-        [Fact]
-        public async Task Prepend4()
-        {
-            var xs = new[] {1, 2, 3}.ToAsyncEnumerable();
-
-            var res = xs.Prepend(4);
-            Assert.Equal(4, await res.Count());
-        }
-
-
-        [Fact]
-        public async Task Prepend5()
-        {
-            var xs = AsyncEnumerable.Range(1, 3)
-                                    .Where(i => true);
-
-            var res = xs.Prepend(4);
-
-            var a = new[] {4, 1, 2, 3};
-
-            var arr = await res.ToArray();
-            Assert.Equal(a, arr);
-        }
-
-        [Fact]
-        public async Task Prepend6()
-        {
-            var xs = AsyncEnumerable.Range(1, 3)
-                                    .Where(i => true);
-            var res = xs.Prepend(4);
-            var a = new List<int>
-            {
-                4,
-                1,
-                2,
-                3
-            };
-            var arr = await res.ToList();
-            Assert.Equal(a, arr);
-        }
-
-
-        [Fact]
-        public async Task Prepend7()
-        {
-            var xs = AsyncEnumerable.Range(1, 3)
-                                    .Where(i => true);
-
-            var res = xs.Prepend(4);
-            Assert.Equal(4, await res.Count());
-        }
-
-
-        [Fact]
-        public async Task Prepend8()
-        {
-            var xs = AsyncEnumerable.Range(1, 3)
-                                    .Where(i => true);
-
-            var res = xs.Prepend(4);
-
-            await SequenceIdentity(res);
-        }
-
-        [Fact]
-        public void PrependN1()
-        {
-            var xs = new[] {1, 2, 3}.ToAsyncEnumerable();
-
-            var res = xs.Prepend(4)
-                        .Prepend(5)
-                        .Prepend(6);
-
-            var e = res.GetAsyncEnumerator();
-
-            HasNext(e, 6);
-            HasNext(e, 5);
-            HasNext(e, 4);
-            HasNext(e, 1);
-            HasNext(e, 2);
-            HasNext(e, 3);
-            NoNext(e);
-        }
-
-        [Fact]
-        public async Task PrependN2()
-        {
-            var xs = new[] {1, 2, 3}.ToAsyncEnumerable();
-
-            var res = xs.Prepend(4)
-                        .Prepend(5)
-                        .Prepend(6);
-
-            var a = new[] {6, 5, 4, 1, 2, 3};
-
-            var arr = await res.ToArray();
-            Assert.Equal(a, arr);
-        }
-
-        [Fact]
-        public async Task PrependN3()
-        {
-            var xs = new[] {1, 2, 3}.ToAsyncEnumerable();
-            var res = xs.Prepend(4)
-                        .Prepend(5)
-                        .Prepend(6);
-
-            var a = new List<int>
-            {
-                6,
-                5,
-                4,
-                1,
-                2,
-                3
-            };
-
-            var arr = await res.ToList();
-            Assert.Equal(a, arr);
-        }
-
-        [Fact]
-        public async Task PrependN4()
-        {
-            var xs = new[] {1, 2, 3}.ToAsyncEnumerable();
-
-            var res = xs.Prepend(4)
-                        .Prepend(5)
-                        .Prepend(6);
-            Assert.Equal(6, await res.Count());
-        }
-
-        [Fact]
-        public async Task PrependN5()
-        {
-            var xs = AsyncEnumerable.Range(1, 3)
-                                    .Where(i => true);
-
-            var res = xs.Prepend(4)
-                        .Prepend(5)
-                        .Prepend(6);
-
-            var a = new[] {6, 5, 4, 1, 2, 3};
-
-            var arr = await res.ToArray();
-            Assert.Equal(a, arr);
-        }
-
-        [Fact]
-        public async Task PrependN6()
-        {
-            var xs = AsyncEnumerable.Range(1, 3)
-                                    .Where(i => true);
-            var res = xs.Prepend(4)
-                        .Prepend(5)
-                        .Prepend(6);
-
-            var a = new List<int>
-            {
-                6,
-                5,
-                4,
-                1,
-                2,
-                3
-            };
-
-            var arr = await res.ToList();
-            Assert.Equal(a, arr);
-        }
-
-        [Fact]
-        public async Task PrependN7()
-        {
-            var xs = AsyncEnumerable.Range(1, 3)
-                                    .Where(i => true);
-
-            var res = xs.Prepend(4)
-                        .Prepend(5)
-                        .Prepend(6);
-            Assert.Equal(6, await res.Count());
-        }
-
-
         [Fact]
         public void AppendPrepend1()
         {

Ix.NET/Source/System.Linq.Async.Tests/System/Linq/Operators/Append.cs

@@ -0,0 +1,237 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// 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;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace Tests
+{
+    public class Append : AsyncEnumerableTests
+    {
+        [Fact]
+        public void Append_Null()
+        {
+            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Append(null, 42));
+        }
+
+        [Fact]
+        public void Append1()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+
+            var res = xs.Append(4);
+
+            var e = res.GetAsyncEnumerator();
+
+            HasNext(e, 1);
+            HasNext(e, 2);
+            HasNext(e, 3);
+            HasNext(e, 4);
+            NoNext(e);
+        }
+
+        [Fact]
+        public async Task Append2()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+
+            var res = xs.Append(4);
+
+            var a = new[] { 1, 2, 3, 4 };
+
+            var arr = await res.ToArray();
+            Assert.Equal(a, arr);
+        }
+
+        [Fact]
+        public async Task Append3()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+            var res = xs.Append(4);
+            var a = new List<int>
+            {
+                1,
+                2,
+                3,
+                4
+            };
+            var arr = await res.ToList();
+            Assert.Equal(a, arr);
+        }
+
+        [Fact]
+        public async Task Append4()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+
+            var res = xs.Append(4);
+            Assert.Equal(4, await res.Count());
+        }
+
+        [Fact]
+        public async Task Append5()
+        {
+            var xs = AsyncEnumerable.Range(1, 3)
+                                    .Where(i => true);
+
+            var res = xs.Append(4);
+
+            var a = new[] { 1, 2, 3, 4 };
+
+            var arr = await res.ToArray();
+            Assert.Equal(a, arr);
+        }
+
+        [Fact]
+        public async Task Append6()
+        {
+            var xs = AsyncEnumerable.Range(1, 3)
+                                    .Where(i => true);
+
+            var res = xs.Append(4);
+            Assert.Equal(4, await res.Count());
+        }
+
+        [Fact]
+        public async Task Append7()
+        {
+            var xs = AsyncEnumerable.Range(1, 3)
+                                    .Where(i => true);
+            var res = xs.Append(4);
+            var a = new List<int>
+            {
+                1,
+                2,
+                3,
+                4
+            };
+            var arr = await res.ToList();
+            Assert.Equal(a, arr);
+        }
+
+
+        [Fact]
+        public void AppendN1()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+
+            var res = xs.Append(4)
+                        .Append(5)
+                        .Append(6);
+
+            var e = res.GetAsyncEnumerator();
+
+            HasNext(e, 1);
+            HasNext(e, 2);
+            HasNext(e, 3);
+            HasNext(e, 4);
+            HasNext(e, 5);
+            HasNext(e, 6);
+            NoNext(e);
+        }
+
+        [Fact]
+        public async Task AppendN2()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+
+            var res = xs.Append(4)
+                        .Append(5)
+                        .Append(6);
+
+            var a = new[] { 1, 2, 3, 4, 5, 6 };
+
+            var arr = await res.ToArray();
+            Assert.Equal(a, arr);
+        }
+
+        [Fact]
+        public async Task AppendN3()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+            var res = xs.Append(4)
+                        .Append(5)
+                        .Append(6);
+
+            var a = new List<int>
+            {
+                1,
+                2,
+                3,
+                4,
+                5,
+                6
+            };
+
+            var arr = await res.ToList();
+            Assert.Equal(a, arr);
+        }
+
+
+        [Fact]
+        public async Task AppendN5()
+        {
+            var xs = AsyncEnumerable.Range(1, 3)
+                                    .Where(i => true);
+
+            var res = xs.Append(4)
+                        .Append(5)
+                        .Append(6);
+
+            var a = new[] { 1, 2, 3, 4, 5, 6 };
+
+            var arr = await res.ToArray();
+            Assert.Equal(a, arr);
+        }
+
+        [Fact]
+        public async Task AppendN6()
+        {
+            var xs = AsyncEnumerable.Range(1, 3)
+                                    .Where(i => true);
+            var res = xs.Append(4)
+                        .Append(5)
+                        .Append(6);
+
+            var a = new List<int>
+            {
+                1,
+                2,
+                3,
+                4,
+                5,
+                6
+            };
+
+            var arr = await res.ToList();
+            Assert.Equal(a, arr);
+        }
+
+        [Fact]
+        public async Task AppendN7()
+        {
+            var xs = AsyncEnumerable.Range(1, 3)
+                                    .Where(i => true);
+
+            var res = xs.Append(4)
+                        .Append(5)
+                        .Append(6);
+            Assert.Equal(6, await res.Count());
+        }
+
+        [Fact]
+        public async Task AppenN4()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+
+            var res = xs.Append(4)
+                        .Append(5)
+                        .Append(6);
+            Assert.Equal(6, await res.Count());
+        }
+    }
+}

Ix.NET/Source/System.Linq.Async.Tests/System/Linq/Operators/Prepend.cs

@@ -0,0 +1,250 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// 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;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace Tests
+{
+    public class Prepend : AsyncEnumerableTests
+    {
+        [Fact]
+        public void Prepend_Null()
+        {
+            AssertThrows<ArgumentNullException>(() => AsyncEnumerable.Prepend(null, 42));
+        }
+
+        [Fact]
+        public void Prepend1()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+
+            var res = xs.Prepend(4);
+
+            var e = res.GetAsyncEnumerator();
+
+            HasNext(e, 4);
+            HasNext(e, 1);
+            HasNext(e, 2);
+            HasNext(e, 3);
+            NoNext(e);
+        }
+
+        [Fact]
+        public async Task Prepend2()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+
+            var res = xs.Prepend(4);
+
+            var a = new[] { 4, 1, 2, 3 };
+
+            var arr = await res.ToArray();
+            Assert.Equal(a, arr);
+        }
+
+        [Fact]
+        public async Task Prepend3()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+            var res = xs.Prepend(4);
+            var a = new List<int>
+            {
+                4,
+                1,
+                2,
+                3
+            };
+            var arr = await res.ToList();
+            Assert.Equal(a, arr);
+        }
+
+
+        [Fact]
+        public async Task Prepend4()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+
+            var res = xs.Prepend(4);
+            Assert.Equal(4, await res.Count());
+        }
+
+
+        [Fact]
+        public async Task Prepend5()
+        {
+            var xs = AsyncEnumerable.Range(1, 3)
+                                    .Where(i => true);
+
+            var res = xs.Prepend(4);
+
+            var a = new[] { 4, 1, 2, 3 };
+
+            var arr = await res.ToArray();
+            Assert.Equal(a, arr);
+        }
+
+        [Fact]
+        public async Task Prepend6()
+        {
+            var xs = AsyncEnumerable.Range(1, 3)
+                                    .Where(i => true);
+            var res = xs.Prepend(4);
+            var a = new List<int>
+            {
+                4,
+                1,
+                2,
+                3
+            };
+            var arr = await res.ToList();
+            Assert.Equal(a, arr);
+        }
+
+
+        [Fact]
+        public async Task Prepend7()
+        {
+            var xs = AsyncEnumerable.Range(1, 3)
+                                    .Where(i => true);
+
+            var res = xs.Prepend(4);
+            Assert.Equal(4, await res.Count());
+        }
+
+
+        [Fact]
+        public async Task Prepend8()
+        {
+            var xs = AsyncEnumerable.Range(1, 3)
+                                    .Where(i => true);
+
+            var res = xs.Prepend(4);
+
+            await SequenceIdentity(res);
+        }
+
+        [Fact]
+        public void PrependN1()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+
+            var res = xs.Prepend(4)
+                        .Prepend(5)
+                        .Prepend(6);
+
+            var e = res.GetAsyncEnumerator();
+
+            HasNext(e, 6);
+            HasNext(e, 5);
+            HasNext(e, 4);
+            HasNext(e, 1);
+            HasNext(e, 2);
+            HasNext(e, 3);
+            NoNext(e);
+        }
+
+        [Fact]
+        public async Task PrependN2()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+
+            var res = xs.Prepend(4)
+                        .Prepend(5)
+                        .Prepend(6);
+
+            var a = new[] { 6, 5, 4, 1, 2, 3 };
+
+            var arr = await res.ToArray();
+            Assert.Equal(a, arr);
+        }
+
+        [Fact]
+        public async Task PrependN3()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+            var res = xs.Prepend(4)
+                        .Prepend(5)
+                        .Prepend(6);
+
+            var a = new List<int>
+            {
+                6,
+                5,
+                4,
+                1,
+                2,
+                3
+            };
+
+            var arr = await res.ToList();
+            Assert.Equal(a, arr);
+        }
+
+        [Fact]
+        public async Task PrependN4()
+        {
+            var xs = new[] { 1, 2, 3 }.ToAsyncEnumerable();
+
+            var res = xs.Prepend(4)
+                        .Prepend(5)
+                        .Prepend(6);
+            Assert.Equal(6, await res.Count());
+        }
+
+        [Fact]
+        public async Task PrependN5()
+        {
+            var xs = AsyncEnumerable.Range(1, 3)
+                                    .Where(i => true);
+
+            var res = xs.Prepend(4)
+                        .Prepend(5)
+                        .Prepend(6);
+
+            var a = new[] { 6, 5, 4, 1, 2, 3 };
+
+            var arr = await res.ToArray();
+            Assert.Equal(a, arr);
+        }
+
+        [Fact]
+        public async Task PrependN6()
+        {
+            var xs = AsyncEnumerable.Range(1, 3)
+                                    .Where(i => true);
+            var res = xs.Prepend(4)
+                        .Prepend(5)
+                        .Prepend(6);
+
+            var a = new List<int>
+            {
+                6,
+                5,
+                4,
+                1,
+                2,
+                3
+            };
+
+            var arr = await res.ToList();
+            Assert.Equal(a, arr);
+        }
+
+        [Fact]
+        public async Task PrependN7()
+        {
+            var xs = AsyncEnumerable.Range(1, 3)
+                                    .Where(i => true);
+
+            var res = xs.Prepend(4)
+                        .Prepend(5)
+                        .Prepend(6);
+            Assert.Equal(6, await res.Count());
+        }
+    }
+}