Add some webhook_handler logic fixes and test

webhook_handler.go

@@ -32,7 +32,13 @@ func (b *Bot) WebhookHandler() http.HandlerFunc {
 		case <-req.Context().Done():
 			b.error("some updates lost, ctx done")
 			return
+		default:
+		}
+
+		select {
 		case b.updates <- update:
+		case <-req.Context().Done():
+			b.error("failed to send update, ctx done")
 		}
 	}
 }

webhook_handler_test.go

@@ -170,6 +170,7 @@ func TestWebhookHandler_ContextDone(t *testing.T) {
 	case <-bot.updates:
 		t.Fatal("Did not expect update to be sent to bot.updates channel")
 	default:
+		// Expected outcome, context was cancelled before sending the update
 	}
 
 	if len(errorsHandler.errors) == 0 {