From 119976ffc18cafc1a1e0992dd565fe4ae464ee6b Mon Sep 17 00:00:00 2001
From: wuzhenghui <wuzhenghui@espressif.com>
Date: Mon, 13 Oct 2025 17:20:04 +0800
Subject: [PATCH] ci(esp_pm): add test case for USJ printing performance during
 wake-up

Add a new test case to verify that USJ printing doesn't block CPU on chip
wake-up from light sleep. The test measures the average time per print
operation and ensures it's below 5000 microseconds.
---
 .../test_apps/esp_pm/main/CMakeLists.txt      |  2 +-
 .../esp_pm/test_apps/esp_pm/main/test_pm.c    | 26 ++++++++++++++++++-
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/components/esp_pm/test_apps/esp_pm/main/CMakeLists.txt b/components/esp_pm/test_apps/esp_pm/main/CMakeLists.txt
index 5cab931963..05bdb49e1b 100644
--- a/components/esp_pm/test_apps/esp_pm/main/CMakeLists.txt
+++ b/components/esp_pm/test_apps/esp_pm/main/CMakeLists.txt
@@ -5,5 +5,5 @@ set(sources "test_app_main.c"
 # the component must be registered as a WHOLE_ARCHIVE
 idf_component_register(SRCS ${sources}
                        INCLUDE_DIRS "."
-                       PRIV_REQUIRES unity esp_pm ulp driver esp_timer
+                       PRIV_REQUIRES unity esp_pm ulp driver esp_timer vfs
                        WHOLE_ARCHIVE)
diff --git a/components/esp_pm/test_apps/esp_pm/main/test_pm.c b/components/esp_pm/test_apps/esp_pm/main/test_pm.c
index 8ce499058e..a0ad699b47 100644
--- a/components/esp_pm/test_apps/esp_pm/main/test_pm.c
+++ b/components/esp_pm/test_apps/esp_pm/main/test_pm.c
@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2022-2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2022-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Unlicense OR CC0-1.0
  */
@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
+#include <unistd.h>
 #include <time.h>
 #include <sys/time.h>
 #include <sys/param.h>
@@ -392,6 +393,29 @@ TEST_CASE("esp_timer with SKIP_UNHANDLED_EVENTS does not wake up CPU from sleep"
     TEST_ESP_OK(esp_timer_delete(periodic_timer));
 }
 
+TEST_CASE("Test USJ printing doesn't block CPU on chip wake-up", "[pm]")
+{
+    light_sleep_enable();
+    fflush(stdout);
+    fsync(fileno(stdout));
+    int64_t printing_time_cost_us = 0, time_end, time_start;
+
+    for (int i = 0; i < 20; ++i)
+    {
+        time_start = esp_timer_get_time();
+        printf("Dummy print %02d\n", i);
+        fflush(stdout);
+        fsync(fileno(stdout));
+        time_end = esp_timer_get_time();
+        printing_time_cost_us += time_end - time_start;
+        vTaskDelay(10);
+    }
+    int32_t avg_cost = (int32_t)(printing_time_cost_us / 20);
+    printf("Average cost per print %ld\n", avg_cost);
+    TEST_ASSERT_LESS_THAN(5000, avg_cost);
+    light_sleep_disable();
+}
+
 #endif // CONFIG_FREERTOS_USE_TICKLESS_IDLE
 
 #endif // CONFIG_PM_ENABLE