fix(quic): exclude locally rejected datagrams [CI]

backend/shared/tests/MoShiro.Measurement.Tests/MeasurementTests.cs

@@ -307,6 +307,20 @@ public sealed class MeasurementTests
         Assert.Equal([1L], rows.Take(0, all: true)!.Find("seq")!.Values);
     }
 
+    [Fact]
+    public void EchoRows_DiscardedLocalSendIsNotReportedAsNetworkLoss()
+    {
+        var rows = new EchoRows(Kinds.UdpEcho, 64, EchoRows.DatagramGraceUs, settleOnReply: false);
+        uint unsent = rows.Add(64, 0);
+        Assert.True(rows.Discard(unsent));
+
+        uint sent = rows.Add(64, 1_000_000);
+        Assert.Equal(1, rows.Count);
+        RawStream cut = rows.Take(3_500_000, all: false)!;
+        Assert.Equal([(long)sent], cut.Find("seq")!.Values);
+        Assert.Equal([false], cut.Find("t4")!.Valid!);
+    }
+
     // ---- 积木目录 ----
 
     [Fact]