tests: finish CPU load phases after a complete real window

tests/test_uasync_load.c

@@ -175,19 +175,23 @@ static void* other_thread(void* arg) {
 }
 
 static void real_phase(struct UASYNC* ua, const char* name, double minimum, double maximum) {
-    uint64_t start = get_time_us(), deadline = start + 1400000, last = snapshot(ua).sample_time_us;
+    uint64_t start = get_time_us(), deadline = start + 3000000;
+    struct uasync_load load = snapshot(ua);
+    uint64_t last = load.sample_time_us;
     uint64_t before_cpu = real_time_ns(CLOCK_THREAD_CPUTIME_ID);
     unsigned int updates = 0;
-    while (get_time_us() < deadline) {
+    // Полное реальное окно новой фазы и минимум десять отсчётов; лишние 400мс не требуются.
+    while ((load.sample_time_us < start + 1000000 || load.window_us < 1000000 || updates < 10) && get_time_us() < deadline) {
         uasync_poll(ua, 1000);
-        uint64_t sample = snapshot(ua).sample_time_us;
-        if (sample != last) { updates++; last = sample; }
+        load = snapshot(ua);
+        if (load.sample_time_us != last) { updates++; last = load.sample_time_us; }
     }
-    struct uasync_load load = snapshot(ua);
     double reference = (double)(real_time_ns(CLOCK_THREAD_CPUTIME_ID) - before_cpu) / (get_time_us() - start) / 10;
-    printf("LIVE %-18s current=%6.2f%% average=%6.2f%% reference=%6.2f%% updates=%u window=%lluus\n",
-           name, load.current_percent, load.average_percent, reference, updates, (unsigned long long)load.window_us);
+    printf("LIVE %-18s current=%6.2f%% average=%6.2f%% reference=%6.2f%% updates=%u window=%lluus elapsed=%lluus\n",
+           name, load.current_percent, load.average_percent, reference, updates,
+           (unsigned long long)load.window_us, (unsigned long long)(get_time_us() - start));
     CHECK(load.valid); CHECK(load.window_us == 1000000);
+    CHECK(load.sample_time_us >= start + 1000000);
     CHECK(load.average_percent >= minimum && load.average_percent <= maximum);
     CHECK(fabs(load.average_percent - reference) < 15);
     CHECK(updates >= 10 && updates <= 16);