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src/UniTask.NetCoreTests/Linq/Projection.cs

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+using Cysharp.Threading.Tasks;
+using Cysharp.Threading.Tasks.Linq;
+using FluentAssertions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reactive.Concurrency;
+using System.Reactive.Linq;
+using System.Threading.Tasks;
+using Xunit;
+
+
+namespace NetCoreTests.Linq
+{
+    public class Projection
+    {
+        [Theory]
+        [InlineData(0, 0)]
+        [InlineData(0, 1)]
+        [InlineData(0, 2)]
+        [InlineData(0, 10)]
+        public async Task Reverse(int start, int count)
+        {
+            var xs = await Enumerable.Range(start, count).ToUniTaskAsyncEnumerable().Reverse().ToArrayAsync();
+            var ys = Enumerable.Range(start, count).Reverse().ToArray();
+
+            xs.Should().BeEquivalentTo(ys);
+        }
+
+        [Fact]
+        public async Task ReverseException()
+        {
+            foreach (var item in UniTaskTestException.Throws())
+            {
+                var xs = item.Reverse().ToArrayAsync();
+                await Assert.ThrowsAsync<UniTaskTestException>(async () => await xs);
+            }
+        }
+    }
+}