Add test for unity AsyncOperation

src/UniTask/Assets/Tests/AsyncOperationTest.cs

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+using System.Collections;
+using System.Threading;
+using Cysharp.Threading.Tasks;
+using FluentAssertions;
+using NUnit.Framework;
+using UnityEngine;
+using UnityEngine.TestTools;
+
+#if CSHARP_7_OR_LATER || (UNITY_2018_3_OR_NEWER && (NET_STANDARD_2_0 || NET_4_6))
+#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
+
+namespace Cysharp.Threading.TasksTests
+{
+    public class AsyncOperationTest
+    {
+        [UnityTest]
+        public IEnumerator ResourcesLoad_CancelOnPlayerLoop() => UniTask.ToCoroutine(async () =>
+        {
+            var cts = new CancellationTokenSource();
+            var task = Resources.LoadAsync<Texture>("sample_texture").ToUniTask(cancellationToken: cts.Token, handleImmediately: false);
+            
+            cts.Cancel();
+            task.Status.Should().Be(UniTaskStatus.Pending);
+
+            await UniTask.NextFrame();
+            task.Status.Should().Be(UniTaskStatus.Canceled);
+        });
+        
+        [Test]
+        public void ResourcesLoad_CancelImmediately()
+        {
+            {
+                var cts = new CancellationTokenSource();
+                var task = Resources.LoadAsync<Texture>("sample_texture").ToUniTask(cancellationToken: cts.Token, handleImmediately: true);
+
+                cts.Cancel();
+                task.Status.Should().Be(UniTaskStatus.Canceled);
+            }
+        }
+    }
+}
+#endif

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