diff --git a/tests/test_etcp_packet_link.c b/tests/test_etcp_packet_link.c
index 5c35413dc..a2d3bbf57 100644
--- a/tests/test_etcp_packet_link.c
+++ b/tests/test_etcp_packet_link.c
@@ -71,6 +71,14 @@ int main(void) {
     assert(first.sent == 1 && etcp_link_io_ready(a));
     assert(packet_link_send(etcp_link_io_get(a), held) == PACKET_LINK_OK && first.sent == 2);
 
+    /* Счётчик ETCP измеряет принятие драйвером, включая временную очередь UDP; отказ не считается. */
+    uint64_t sent_before = conn->diagnostic_wire_tx_bytes;
+    const uint8_t value = 42; first.blocked = 1;
+    assert(etcp_link_io_send(a, &value, 1) == 1 && conn->diagnostic_wire_tx_bytes == sent_before + 1);
+    assert(etcp_link_io_send(a, &value, 1) == -2 && conn->diagnostic_wire_tx_bytes == sent_before + 1);
+    first.blocked = 0; etcp_link_io_socket_writable(sock.fd, &sock);
+    assert(conn->diagnostic_wire_tx_bytes == sent_before + 1 && etcp_link_io_ready(a));
+
     /* Подготовка не снимает ACK; отказ не меняет очередь/служебные признаки. */
     b->initialized = b->link_status = 0;
     struct ACK_PACKET* ack = (struct ACK_PACKET*)queue_entry_new_from_pool(inst.ack_pool); assert(ack);
diff --git a/tools/chatgui/tests/test_call_commands.cpp b/tools/chatgui/tests/test_call_commands.cpp
index babd0976a..303ce238f 100644
--- a/tools/chatgui/tests/test_call_commands.cpp
+++ b/tools/chatgui/tests/test_call_commands.cpp
@@ -1,6 +1,8 @@
 /* Настоящие CallWindow/bridge/uasync: владение call-командами при отказе, отмене и исполнении.
  * Linux hooks наблюдают границу native trampoline и затем вызывают его без подмены освобождения payload. */
 #include "../src/callwindow.h"
+#include "../src/call_audio_graphs.h"
+#include "call/call_history_store.h"
 #include "../src/call_camera_capture.h"
 #include "../src/call_video_engine.h"
 #include "../transport/gui_bridge.h"
@@ -161,6 +163,28 @@ private slots:
         observed.clear(); bindingValid = true;
         QCoreApplication::sendPostedEvents(nullptr, QEvent::DeferredDelete);
     }
+    void audioHistoryGraphs() {
+        CallWindow window; window.setCallId(77); window.setState(CallWindow::Active); window.show();
+        auto* button = window.findChild<QPushButton*>("callAudioGraphsButton"); QVERIFY(button); QVERIFY(button->isVisible());
+        button->click();
+        auto* child = window.findChild<QWidget*>("callAudioGraphs"); QVERIFY(child); QVERIFY(child->isVisible());
+        auto* graphs = static_cast<CallAudioGraphs*>(child);
+        CallHistoryStore history; uint64_t sent = 0;
+        for (int i = 0; i < 600; ++i) {
+            int depth = 500 + (int)(250 * std::sin(i / 25.0));
+            bool missing = i >= 230 && i < 245;
+            history.receive(i * 50, missing ? 0 : depth, 200, 100, 2400, missing ? 2400 : 0);
+            sent += i % 4 == 0 ? 500 : 0;
+            history.transmit({(uint64_t)i * 50, (uint64_t)(i % 100) * 20, 800, 1200, 42, 9, sent});
+        }
+        call_audio_history snapshot; history.snapshot(29950, snapshot); graphs->setSnapshot(snapshot);
+        QCoreApplication::processEvents(); QVERIFY(!graphs->grab().isNull());
+        const QString screenshot = qEnvironmentVariable("UTUN_TEST_AUDIO_GRAPHS_SCREENSHOT");
+        if (!screenshot.isEmpty()) QVERIFY(graphs->grab().save(screenshot));
+        graphs->close(); QVERIFY(!graphs->isVisible()); QCOMPARE(window.state(), CallWindow::Active);
+        button->click(); QVERIFY(graphs->isVisible());
+        window.setState(CallWindow::Ended);
+    }
     void videoSettingsMenus() {
         CallWindow window; window.setCallId(77); window.setPeerName(QStringLiteral("Video call")); window.setState(CallWindow::Active);
         auto* engine = window.findChild<CallVideoEngine*>(); QVERIFY(engine);
diff --git a/tools/chatgui/tests/test_call_jitter.cpp b/tools/chatgui/tests/test_call_jitter.cpp
index 27af4acad..abfb12e79 100644
--- a/tools/chatgui/tests/test_call_jitter.cpp
+++ b/tools/chatgui/tests/test_call_jitter.cpp
@@ -218,6 +218,17 @@ static void test_audio_history() {
     history.snapshot(89950, snapshot);
     CHECK(snapshot.rx_count == 600 && snapshot.rx[0].at_ms == 60000);
     CHECK(std::abs(snapshot.histogram[60] - 1) < .001);
+    CallHistoryStore traffic;
+    for (unsigned i = 0; i <= 20; ++i) traffic.transmit({1000 + i * 50, 0, 0, 0, 42, 7, i * 100});
+    traffic.snapshot(2000, snapshot);
+    CHECK(snapshot.tx[0].wire_bytes_per_sec == -1);
+    CHECK(snapshot.tx[20].wire_bytes_per_sec == 2000);
+    traffic.transmit({2050, 0, 0, 0, 43, 8, 900000}); traffic.snapshot(2050, snapshot);
+    CHECK(snapshot.tx[21].wire_bytes_per_sec == -1); // Смена пути не выглядит скачком трафика.
+    traffic.transmit({2100, 0, 0, 0, 43, 8, 900100}); traffic.snapshot(2100, snapshot);
+    CHECK(snapshot.tx[22].wire_bytes_per_sec == 2000);
+    traffic.transmit({2400, 0, 0, 0, 43, 8, 900200}); traffic.snapshot(2400, snapshot);
+    CHECK(snapshot.tx[23].wire_bytes_per_sec == -1); // Пропущенные измерения не интерполируются.
     puts("audio history: time weights, startup exclusion, gaps, overflow bin and ring expiry PASS");
 }