diff --git a/tests/Makefile.am b/tests/Makefile.am
index 6f573023..dda207f5 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -100,6 +100,7 @@ check_PROGRAMS += \
     test_stun_nat \
     test_reality_fallback \
     test_etcp_padding \
+    test_broadcast_cache \
     test_ll_queue_regressions \
     test_standby \
     test_standby_transport \
@@ -301,6 +302,9 @@ async_regression_ldflags = -Wl,--wrap=u_malloc_impl -Wl,--wrap=u_calloc_impl -Wl
 test_etcp_padding_SOURCES = test_etcp_padding.c
 test_etcp_padding_LDADD = $(LIBUTUN) $(COMMON_LIBS)
 test_etcp_padding_LDFLAGS = -Wl,--wrap=uasync_set_timeout -Wl,--wrap=socket_sendto
+test_broadcast_cache_SOURCES = test_broadcast_cache.c
+test_broadcast_cache_LDADD = $(LIBUTUN) $(COMMON_LIBS)
+test_broadcast_cache_LDFLAGS = -Wl,--wrap=clock_gettime -Wl,--wrap=uasync_set_timeout
 test_uasync_regressions_SOURCES = test_uasync_regressions.c $(async_regression_sources)
 test_uasync_regressions_LDADD = $(COMMON_LIBS)
 test_uasync_regressions_LDFLAGS = $(async_regression_ldflags)
diff --git a/tests/test_broadcast_cache.c b/tests/test_broadcast_cache.c
new file mode 100644
index 00000000..ab9b211b
--- /dev/null
+++ b/tests/test_broadcast_cache.c
@@ -0,0 +1,120 @@
+/* TTL и callbacks broadcast: реальные очереди/таймеры, управляемая шкала времени. */
+#define _GNU_SOURCE
+#include "utun_instance.h"
+#include "topo_group.h"
+#include "broadcast.h"
+#include "../lib/debug_config.h"
+#include "../lib/mem.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#define CHECK(c) do { if (!(c)) { fprintf(stderr, "FAIL %s:%d: %s\n", __func__, __LINE__, #c); exit(1); } } while (0)
+
+/* Вход приёма, используемый ETCP-диспетчером внутри broadcast.c. */
+void broadcast_recv(struct TOPO_GROUP*, struct ETCP_CONN*, const uint8_t*, size_t);
+
+static uint64_t now_us = 1000000;
+static int fail_timer, calls, order[16], order_count;
+
+int __real_clock_gettime(clockid_t id, struct timespec* ts);
+int __wrap_clock_gettime(clockid_t id, struct timespec* ts) {
+    if (id != CLOCK_BOOTTIME) return __real_clock_gettime(id, ts);
+    ts->tv_sec = now_us / 1000000; ts->tv_nsec = now_us % 1000000 * 1000;
+    return 0;
+}
+
+void* __real_uasync_set_timeout(struct UASYNC*, int, void*, timeout_callback_t, const char*);
+void* __wrap_uasync_set_timeout(struct UASYNC* ua, int tb, void* arg, timeout_callback_t cb, const char* name) {
+    if (fail_timer && name && strcmp(name, "broadcast_cleanup_timer") == 0) return NULL;
+    return __real_uasync_set_timeout(ua, tb, arg, cb, name);
+}
+
+static void received(const uint8_t* uuid, const uint8_t* data, uint16_t len, void* arg) {
+    CHECK(uuid && len == 3 && data[0] == 1 && data[1] == 0 && data[2] == 2);
+    CHECK(order_count < (int)(sizeof(order) / sizeof(order[0])));
+    order[order_count++] = (int)(intptr_t)arg;
+    calls++;
+}
+
+static void receive_id(struct TOPO_GROUP* group, uint8_t id) {
+    uint8_t payload[BROADCAST_UUID_SIZE + 2 + 3] = {0};
+    payload[0] = id; payload[BROADCAST_UUID_SIZE] = 3;
+    payload[BROADCAST_UUID_SIZE + 2] = 1; payload[BROADCAST_UUID_SIZE + 4] = 2;
+    order_count = 0;
+    broadcast_recv(group, NULL, payload, sizeof(payload));
+}
+
+static void cleanup_tick(struct UASYNC* ua) {
+    now_us += (uint64_t)BROADCAST_CLEANUP_INTERVAL_TB * 100;
+    uasync_poll(ua, 0);
+}
+
+static void test_ttl(struct UASYNC* ua, struct TOPO_GROUP* group) {
+    calls = 0;
+    CHECK(broadcast_init(group) == 0);
+    broadcast_add_cbk(group, received, (void*)(intptr_t)1);
+    receive_id(group, 1); CHECK(calls == 1);
+    receive_id(group, 1); CHECK(calls == 1);
+    cleanup_tick(ua); /* 60с: исходный UUID ещё свежий. */
+    receive_id(group, 1); CHECK(calls == 1);
+    receive_id(group, 2); CHECK(calls == 2);
+    cleanup_tick(ua); /* 120с: равенство TTL ещё не удаляет запись. */
+    receive_id(group, 1); CHECK(calls == 2);
+    receive_id(group, 2); CHECK(calls == 2);
+    cleanup_tick(ua); /* 180с: первый UUID устарел, второму ровно TTL. */
+    receive_id(group, 2); CHECK(calls == 2);
+    receive_id(group, 1); CHECK(calls == 3);
+    cleanup_tick(ua);
+    receive_id(group, 1); CHECK(calls == 3);
+    receive_id(group, 2); CHECK(calls == 4);
+    broadcast_destroy(group); CHECK(!group->broadcast);
+    puts("PASS broadcast TTL: fresh, exact boundary, expired, mixed ages");
+}
+
+static void test_callbacks(struct TOPO_GROUP* group) {
+    calls = 0;
+    CHECK(broadcast_init(group) == 0);
+    CHECK(broadcast_init(group) == -1);
+    broadcast_add_cbk(group, received, (void*)(intptr_t)1);
+    broadcast_add_cbk(group, received, (void*)(intptr_t)2);
+    broadcast_add_cbk(group, received, (void*)(intptr_t)2);
+    receive_id(group, 3);
+    CHECK(calls == 3 && order_count == 3 && order[0] == 2 && order[1] == 2 && order[2] == 1);
+    broadcast_remove_cbk(group, received, (void*)(intptr_t)2);
+    receive_id(group, 4);
+    CHECK(calls == 5 && order_count == 2 && order[0] == 2 && order[1] == 1);
+    broadcast_remove_cbk(group, received, (void*)(intptr_t)2);
+    broadcast_remove_cbk(group, received, (void*)(intptr_t)2);
+    receive_id(group, 5); CHECK(calls == 6 && order_count == 1 && order[0] == 1);
+    const uint8_t data[] = {1, 0, 2};
+    CHECK(broadcast_send(group, data, sizeof(data)) == 0 && calls == 6);
+    CHECK(broadcast_send(group, data, 0) == 0 && calls == 6);
+    CHECK(broadcast_send(group, NULL, 0) == -1);
+    CHECK(broadcast_send(group, data, BROADCAST_MAX_DATA + 1) == -1);
+    broadcast_destroy(group); broadcast_destroy(group);
+    puts("PASS broadcast callbacks: duplicates, order, removal, no local echo");
+}
+
+int main(void) {
+    debug_config_init(); debug_set_level(DEBUG_LEVEL_ERROR);
+    size_t baseline = u_get_allocated_count();
+    struct UASYNC* ua = uasync_create(); CHECK(ua);
+    struct UTUN_INSTANCE inst = {.ua = ua};
+    struct TOPO_GROUP group = {.instance = &inst, .group_id = 42};
+    size_t before = u_get_allocated_count();
+    fail_timer = 1;
+    CHECK(broadcast_init(&group) == -1 && !group.broadcast);
+    CHECK(u_get_allocated_count() == before);
+    fail_timer = 0;
+    test_ttl(ua, &group);
+    test_callbacks(&group);
+    CHECK(broadcast_init(&group) == 0);
+    fail_timer = 1; cleanup_tick(ua);
+    broadcast_destroy(&group);
+    uasync_destroy(ua, 0);
+    CHECK(u_get_allocated_count() == baseline);
+    puts("PASS broadcast timer failures and resource cleanup");
+    return 0;
+}