1 files changed, 42 insertions, 0 deletions
diff --git a/firmware/tests/kernel.c b/firmware/tests/kernel.c
new file mode 100644
index 0000000..c9f84b6
--- /dev/null
+++ b/firmware/tests/kernel.c
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2026 Apidae Systems
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/logging/log.h>
+#include <zephyr/ztest.h>
+
+LOG_MODULE_REGISTER(kernel, LOG_LEVEL_INF);
+
+ZTEST_SUITE(kernel, NULL, NULL, NULL, NULL, NULL);
+
+ZTEST(kernel, test_uptime_advances)
+{
+	int64_t t0 = k_uptime_get();
+
+	k_sleep(K_MSEC(50));
+
+	int64_t t1 = k_uptime_get();
+
+	zassert_true(t1 > t0,
+		     "uptime did not advance: t0=%lld t1=%lld", t0, t1);
+	zassert_true((t1 - t0) >= 40,
+		     "delta %lld ms is implausibly short", (t1 - t0));
+}
+
+ZTEST(kernel, test_log_subsystem_alive)
+{
+	LOG_INF("kernel test ran at uptime=%lld ms", k_uptime_get());
+}
+
+ZTEST(kernel, test_constants_make_sense)
+{
+	zassert_true(CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC > 0,
+		     "SYS_CLOCK_HW_CYCLES_PER_SEC=%d",
+		     CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC);
+	zassert_true(CONFIG_SYS_CLOCK_TICKS_PER_SEC > 0,
+		     "SYS_CLOCK_TICKS_PER_SEC=%d",
+		     CONFIG_SYS_CLOCK_TICKS_PER_SEC);
+}