tests: wip trying to figure out proper way to test sequence

src/StevesBot.Worker.Tests/Unit/DiscordGatewayClientTests.cs

@@ -6,6 +6,7 @@ public sealed class DiscordGatewayClientTests : IDisposable
   private readonly Mock<IWebSocketFactory> _mockWebSocketFactory = new();
   private readonly Mock<ILogger<DiscordGatewayClient>> _mockLogger = new();
   private readonly DiscordClientOptions _options = new();
+# pragma warning disable CA2213
   private readonly DiscordGatewayClient _discordGatewayClient;
 
   public DiscordGatewayClientTests()
@@ -91,8 +92,82 @@ public sealed class DiscordGatewayClientTests : IDisposable
     );
   }
 
+  [Fact]
+  public async Task ConnectAsync_WhenCalledAndHelloEventReceived_ItShouldStartSendingHeartbeats()
+  {
+    _mockDiscordRestClient
+      .Setup(static x => x.GetGatewayUrlAsync(It.IsAny<CancellationToken>()))
+      .ReturnsAsync("wss://gateway.discord.gg");
+
+    var mockWebSocket = new Mock<IWebSocket>();
+
+    mockWebSocket
+      .Setup(static x => x.State)
+      .Returns(WebSocketState.Open);
+
+    var messageQueue = new Queue<(WebSocketReceiveResult, byte[])>();
+
+    var heatbeatInterval = 1000;
+
+    var helloEvent = new
+    {
+      op = 10,
+      d = new
+      {
+        heartbeat_interval = heatbeatInterval,
+      }
+    };
+
+    var helloEventJson = JsonSerializer.Serialize(helloEvent);
+    var helloEventBytes = Encoding.UTF8.GetBytes(helloEventJson);
+
+    var heartbeatAck = new
+    {
+      op = 11,
+    };
+
+    var heartbeatAckJson = JsonSerializer.Serialize(heartbeatAck);
+    var heartbeatAckBytes = Encoding.UTF8.GetBytes(heartbeatAckJson);
+
+    messageQueue.Enqueue((new WebSocketReceiveResult(helloEventBytes.Length, WebSocketMessageType.Text, true), helloEventBytes));
+    messageQueue.Enqueue((new WebSocketReceiveResult(heartbeatAckBytes.Length, WebSocketMessageType.Text, true), heartbeatAckBytes));
+
+    mockWebSocket
+      .Setup(static x => x.SendAsync(It.IsAny<ArraySegment<byte>>(), It.IsAny<WebSocketMessageType>(), It.IsAny<bool>(), It.IsAny<CancellationToken>()))
+      .Returns(Task.CompletedTask);
+
+    mockWebSocket
+      .Setup(static x => x.ReceiveAsync(It.IsAny<ArraySegment<byte>>(), It.IsAny<CancellationToken>()))
+      .Returns((ArraySegment<byte> buffer, CancellationToken token) =>
+       {
+         if (messageQueue.Count == 0)
+         {
+# pragma warning disable CA2008
+           return Task.Delay(-1, token).ContinueWith(_ => new WebSocketReceiveResult(0, WebSocketMessageType.Text, true), token);
+         }
+
+         var (result, messageBytes) = messageQueue.Dequeue();
+         Array.Copy(messageBytes, 0, buffer.Array!, buffer.Offset, Math.Min(messageBytes.Length, buffer.Count));
+         return Task.FromResult(result);
+       });
+
+    _mockWebSocketFactory
+      .Setup(static x => x.Create())
+      .Returns(mockWebSocket.Object);
+
+    using var cts = new CancellationTokenSource();
+
+    await _discordGatewayClient.ConnectAsync(CancellationToken.None);
+
+    await Task.Delay(heatbeatInterval + 30000);
+
+    mockWebSocket.Verify(
+      static x => x.SendAsync(It.IsAny<ArraySegment<byte>>(), It.IsAny<WebSocketMessageType>(), It.IsAny<bool>(), It.IsAny<CancellationToken>()),
+      Times.Once
+    );
+  }
+
   public void Dispose()
   {
-    _discordGatewayClient.Dispose();
   }
 }

src/StevesBot.Worker/Discord/DiscordGatewayClient.cs

@@ -108,8 +108,8 @@ internal class DiscordGatewayClient : IDiscordGatewayClient
 
           if (result.MessageType is WebSocketMessageType.Text)
           {
-# pragma warning disable CA1849
+            await memoryStream.WriteAsync(messageBuffer.AsMemory(0, result.Count), cancellationToken);
-            memoryStream.Write(messageBuffer, 0, result.Count);
+            await memoryStream.FlushAsync(cancellationToken);
           }
 
         } while (result.EndOfMessage is false);