diff --git a/tests/test_stream_core.c b/tests/test_stream_core.c
index 7ee55e05..bdcc1d62 100644
--- a/tests/test_stream_core.c
+++ b/tests/test_stream_core.c
@@ -6,6 +6,7 @@
 #include "../src/stream/stream_source.h"
 #include "../src/stream/stream_metrics.h"
 #include "../src/stream/stream_load.h"
+#include "../src/stream/stream_optimizer.h"
 #include "../lib/debug_config.h"
 #include "../lib/mem.h"
 #include "test_clock.h"
@@ -381,6 +382,26 @@ static void test_source_timer(void) {
     DEBUG_INFO(DEBUG_CATEGORY_STREAM, "[PASS] source: 100ms timer, immediate full batch, padding, finish and cancellation on destroy");
 }
 
+static void test_probe_schedule(void) {
+    struct stream_probe_schedule schedule = {0};
+    CHECK(stream_probe_schedule_tick(&schedule, 0, 40, 0) == 32 && schedule.cycle == 1);
+    CHECK(stream_probe_schedule_tick(&schedule, 999, 8, 32) == 0);
+    CHECK(stream_probe_schedule_tick(&schedule, 1000, 8, 32) == 1 && schedule.cycle == 1);
+    CHECK(stream_probe_schedule_tick(&schedule, 1001, 7, 32) == 0);
+    for (uint64_t now = 2000; now <= 29000; now += 1000)
+        CHECK(stream_probe_schedule_tick(&schedule, now, 0, 0) == 1 && schedule.cycle == 1);
+    CHECK(stream_probe_schedule_tick(&schedule, 29999, 1, 0) == 0); /* Новая запись не добавляет второй burst. */
+    CHECK(stream_probe_schedule_tick(&schedule, 30000, 1, 0) == 1 && schedule.cycle == 1);
+    CHECK(stream_probe_schedule_tick(&schedule, 31000, 0, 1) == 1 && schedule.cycle == 1); /* Ещё идёт старая проба. */
+    CHECK(stream_probe_schedule_tick(&schedule, 32000, 0, 0) == 1 && schedule.cycle == 2 && schedule.started_ms == 32000);
+    CHECK(stream_probe_schedule_tick(&schedule, 32001, 40, 0) == 0);
+    memset(&schedule, 0, sizeof(schedule));
+    CHECK(stream_probe_schedule_tick(&schedule, 0, 0, 0) == 32);
+    CHECK(stream_probe_schedule_tick(&schedule, 30000, 0, 0) == 1 && schedule.cycle == 2);
+    CHECK(stream_probe_schedule_tick(&schedule, 60000, 0, 0) == 1 && schedule.cycle == 3);
+    DEBUG_INFO(DEBUG_CATEGORY_STREAM, "[PASS] probe schedule: one 32-node burst, 1/s, new peers, 30s minimum and unfinished cycles");
+}
+
 int main(void) {
     debug_config_init();
     debug_set_level(DEBUG_LEVEL_ERROR);
@@ -392,6 +413,7 @@ int main(void) {
     test_signed_blocks(); CHECK(u_get_allocated_count() == allocations);
     test_wire(); CHECK(u_get_allocated_count() == allocations);
     test_load(); CHECK(u_get_allocated_count() == allocations);
+    test_probe_schedule(); CHECK(u_get_allocated_count() == allocations);
     test_fec_and_padding(); CHECK(u_get_allocated_count() == allocations);
     test_ring_and_conflicts(); CHECK(u_get_allocated_count() == allocations);
     test_relative_metrics(); CHECK(u_get_allocated_count() == allocations);