refactor(link): bound every teardown and handler wait behind one helper [CI]

backend/fleet/tests/Fleet.Tests/BoundedTests.cs

@@ -0,0 +1,28 @@
+using Fleet.Core;
+
+namespace Fleet.Tests;
+
+public sealed class BoundedTests
+{
+    [Fact]
+    public async Task WaitAsync_ReturnsFalse_WhenTheWorkNeverFinishes()
+    {
+        var never = new TaskCompletionSource();
+        Assert.False(await Bounded.WaitAsync(never.Task, TimeSpan.FromMilliseconds(100), TimeProvider.System));
+    }
+
+    [Fact]
+    public async Task WaitAsync_ReturnsTrue_WhenTheWorkFinishes_OrFailsWithSessionNoise()
+    {
+        Assert.True(await Bounded.WaitAsync(Task.CompletedTask, TimeSpan.FromSeconds(5), TimeProvider.System));
+        Assert.True(await Bounded.WaitAsync(Task.FromException(new IOException("closed")), TimeSpan.FromSeconds(5), TimeProvider.System));
+        Assert.True(await Bounded.WaitAsync(Task.FromException(new ObjectDisposedException("x")), TimeSpan.FromSeconds(5), TimeProvider.System));
+        Assert.True(await Bounded.WaitAsync(Task.FromCanceled(new CancellationToken(true)), TimeSpan.FromSeconds(5), TimeProvider.System));
+    }
+
+    [Fact]
+    public async Task WaitAsync_DoesNotHideRealFailures()
+    {
+        await Assert.ThrowsAsync<FormatException>(() => Bounded.WaitAsync(Task.FromException(new FormatException()), TimeSpan.FromSeconds(5), TimeProvider.System));
+    }
+}

backend/fleet/tests/Fleet.Tests/LinkTests.cs

@@ -275,6 +275,27 @@ public sealed class LinkTests
         await run.WaitAsync(TimeSpan.FromSeconds(5));
     }
 
+    [Fact]
+    public async Task Session_RunEnds_EvenWhenAnInboundHandlerIsStuck()
+    {
+        (TlsFrameTransport left, TlsFrameTransport right) = await PairAsync();
+        MethodTable table = TestTables.Of(TestTables.Req("right.stuck"));
+        var stuck = new TaskCompletionSource<Result<Number>>(TaskCreationOptions.RunContinuationsAsynchronously); // 不理会取消令牌：模拟卡在原生层的处理器
+        var rightRouter = new RpcRouter<string>(RpcSide.Listener, table).On("right.stuck", LinkJson.Default.Number, LinkJson.Default.Number, (_, _, _) => new ValueTask<Result<Number>>(stuck.Task));
+        await using var leftSession = new RpcSession<string>(left, new RpcRouter<string>(RpcSide.Dialer, table), "left", TimeProvider.System);
+        await using var rightSession = new RpcSession<string>(right, rightRouter, "right", TimeProvider.System);
+        Task leftRun = leftSession.RunAsync(default);
+        Task rightRun = rightSession.RunAsync(default);
+
+        _ = leftSession.RequestAsync("right.stuck", new Number { Value = 1 }, LinkJson.Default.Number, LinkJson.Default.Number, default, TimeSpan.FromSeconds(30)).AsTask();
+        await Task.Delay(300); // 请求到达并进入处理器
+        await leftSession.CloseAsync("bye", default);
+
+        await rightRun.WaitAsync(TimeSpan.FromSeconds(10)); // 以前这里会一直等到处理器返回
+        stuck.TrySetResult(Result<Number>.Ok(new Number { Value = 0 }));
+        await leftRun.WaitAsync(TimeSpan.FromSeconds(5));
+    }
+
     // ───────────────────────── 点对点握手 ─────────────────────────
 
     private sealed class PeerFixture : IAsyncDisposable