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test(daemon): bound idle frontend maintenance probes #2101

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test(daemon): bound idle frontend maintenance probes #2101

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21 changes: 21 additions & 0 deletions tests/test_daemon_frontend.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1359,6 +1359,26 @@ TEST(daemon_frontend_idle_uses_one_maintenance_observer) {
ASSERT_TRUE(fixture_closed);
PASS();
}

/* An idle monitor must not repeatedly perform the expensive presence probe
* while no maintenance request exists. The short window is below the
* production idle cadence, so a second observation indicates a hot poll loop. */
TEST(daemon_frontend_idle_maintenance_probe_is_bounded) {
frontend_maintenance_fixture_t fixture;
ASSERT_TRUE(frontend_maintenance_fixture_start(&fixture, "idle-cadence"));

cbm_daemon_frontend_test_observer_reset(false);
cbm_daemon_maintenance_monitor_t *monitor = cbm_daemon_maintenance_monitor_start(
fixture.manager, NULL, NULL, EXIT_SUCCESS, "idle cadence test");
ASSERT_TRUE(monitor != NULL);
cbm_usleep(100 * 1000U);
uint64_t observations = cbm_daemon_frontend_test_monitor_observations();
ASSERT_TRUE(cbm_daemon_maintenance_monitor_stop(&monitor));
frontend_maintenance_fixture_finish(&fixture);

ASSERT_EQ(observations, 1);
PASS();
}
#endif

#ifndef _WIN32
Expand Down Expand Up @@ -1663,6 +1683,7 @@ SUITE(daemon_frontend) {
RUN_TEST(daemon_frontend_rejects_non_notification_cancellation_shapes);
#if defined(CBM_ENABLE_TEST_SEAMS) && CBM_ENABLE_TEST_SEAMS
RUN_TEST(daemon_frontend_idle_uses_one_maintenance_observer);
RUN_TEST(daemon_frontend_idle_maintenance_probe_is_bounded);
#endif
#ifndef _WIN32
RUN_TEST(daemon_frontend_maintenance_exits_while_stdio_reader_is_blocked);
Expand Down
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