fix(esp_timer): add target test for long dump lines

components/esp_timer/test_apps/main/test_esp_timer.c

@@ -506,6 +506,7 @@ TEST_CASE("Can dump esp_timer stats", "[esp_timer]")
        overflow the internal string buffer if the
        length calculation is not correct.
     */
+#if CONFIG_IDF_TARGET_LINUX
     const int NUM_TIMERS = 200;
     esp_timer_handle_t timers[NUM_TIMERS];
 
@@ -525,6 +526,57 @@ TEST_CASE("Can dump esp_timer stats", "[esp_timer]")
     for (int i = 0; i < NUM_TIMERS; ++i) {
         TEST_ESP_OK(esp_timer_delete(timers[i]));
     }
+#else
+    enum {
+        INACTIVE_TIMER_COUNT = 64,
+        NUM_TIMERS = 256,
+    };
+    const uint64_t long_period = (1ULL << 56) - 1;
+    const uint64_t long_alarm = (uint64_t)esp_timer_get_time() + 1000000000000ULL;
+    /* Keep large test buffers off the Unity task stack on smaller targets. */
+    static esp_timer_handle_t inactive_timers[INACTIVE_TIMER_COUNT];
+    static char inactive_names[INACTIVE_TIMER_COUNT][30];
+    static esp_timer_handle_t timers[NUM_TIMERS];
+
+    for (size_t i = 0; i < INACTIVE_TIMER_COUNT; ++i) {
+        snprintf(inactive_names[i], sizeof(inactive_names[i]), "test_timer_number_%zu", i);
+        const esp_timer_create_args_t timer_args = {
+            .callback = &empty_cb,
+            .arg = NULL,
+            .name = inactive_names[i],
+        };
+        TEST_ESP_OK(esp_timer_create(&timer_args, &inactive_timers[i]));
+    }
+
+    for (size_t i = 0; i < NUM_TIMERS; ++i) {
+        const esp_timer_create_args_t timer_args = {
+            .callback = &empty_cb,
+            .name = "dump_long_line_timer",
+        };
+        TEST_ESP_OK(esp_timer_create(&timer_args, &timers[i]));
+        TEST_ESP_OK(esp_timer_start_periodic_at(timers[i], long_period, long_alarm + i));
+    }
+
+    static char dump_buf[4096];
+    memset(dump_buf, 0, sizeof(dump_buf));
+    FILE* stream = fmemopen(dump_buf, sizeof(dump_buf) - 1, "w+");
+    TEST_ASSERT_NOT_NULL(stream);
+    TEST_ESP_OK(esp_timer_dump(stream));
+    fflush(stream);
+    fclose(stream);
+    TEST_ASSERT_NOT_NULL(strstr(dump_buf, "Timer stats:"));
+    TEST_ASSERT_NOT_NULL(strstr(dump_buf, "72057594037927935"));
+    TEST_ASSERT_TRUE(heap_caps_check_integrity_all(true));
+
+    for (size_t i = 0; i < NUM_TIMERS; ++i) {
+        TEST_ESP_OK(esp_timer_stop(timers[i]));
+        TEST_ESP_OK(esp_timer_delete(timers[i]));
+    }
+
+    for (size_t i = 0; i < INACTIVE_TIMER_COUNT; ++i) {
+        TEST_ESP_OK(esp_timer_delete(inactive_timers[i]));
+    }
+#endif
 }
 
 typedef struct {