system: add an example showing how to run non-iram ISR when operating Flash

examples/system/flash_suspend/pytest_flash_suspend.py

@@ -0,0 +1,21 @@
+# SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: CC0-1.0
+
+import pytest
+from pytest_embedded.dut import Dut
+
+
+@pytest.mark.esp32c3
+@pytest.mark.flash_suspend
+@pytest.mark.parametrize('config', [
+    'flash_suspend',
+], indirect=True)
+def test_flash_suspend_example(dut: Dut) -> None:
+    dut.expect_exact('found partition')
+    res = dut.expect(r'During Erase, ISR callback function\(in flash\) response time:\s+(\d+(\.\d{1,2})) us')
+    response_time = res.group(1).decode('utf8')
+    assert 0 <= float(response_time) < 40
+
+    res = dut.expect(r'During Erase, ISR callback function\(in iram\) response time:\s+(\d+(\.\d{1,2})) us')
+    response_time = res.group(1).decode('utf8')
+    assert 0 <= float(response_time) < 5