board native_sim: Test sys_reboot and hw_info reporting the reset cause

Add a test of the CONFIG_NATIVE_SIM_REBOOT functionality together
with the hw_info get_reset_cause() logic.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>

Author: aescolar

tests/boards/native_sim/reset_hw_info/CMakeLists.txt

@@ -0,0 +1,9 @@
+# Copyright (c) 2025 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(native_reset_hw_info)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

tests/boards/native_sim/reset_hw_info/prj.conf

@@ -0,0 +1,6 @@
+# Copyright (c) 2025 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_REBOOT=y
+CONFIG_NATIVE_SIM_REBOOT=y
+CONFIG_HWINFO=y

tests/boards/native_sim/reset_hw_info/src/main.c

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdio.h>
+#include <zephyr/drivers/hwinfo.h>
+#include <zephyr/sys/reboot.h>
+#include <nsi_main.h>
+
+int main(void)
+{
+	uint32_t cause;
+	int err;
+
+	err = hwinfo_get_reset_cause(&cause);
+	if (err != 0) {
+		posix_print_error_and_exit("hwinfo_get_reset_cause() failed %i\n", err);
+	}
+
+	if (cause == RESET_POR) {
+		printf("This seems like the first start => Resetting\n");
+		sys_reboot(SYS_REBOOT_WARM);
+	} else if (cause == RESET_SOFTWARE) {
+		printf("Booted after SOFTWARE reset => we are done\n");
+	}
+	nsi_exit(0);
+}

tests/boards/native_sim/reset_hw_info/testcase.yaml

@@ -0,0 +1,16 @@
+tests:
+  boards.native_sim.reset_hw_info:
+    platform_allow:
+      - native_sim
+      - native_sim/native/64
+    integration_platforms:
+      - native_sim
+    harness: console
+    harness_config:
+      type: multi_line
+      ordered: true
+      regex:
+        - "(.*)Booting Zephyr OS build(.*)"
+        - "This seems like the first start => Resetting"
+        - "(.*)Booting Zephyr OS build(.*)"
+        - "Booted after SOFTWARE reset => we are done"