feature(cdc_teardown): Added iteration test

[roma-jam]

Description

Related

Testing

Added test_app teardown_device for CDC Device Class. The logic of the test:

1. Installs the tinyUSB driver via esp-tinyusb wrapper with 1xCDC class device
2. Awaits device configuration be the Host
3. Awaits the terminal connection
4. Expects the command sequence from the Host
5. Replies with the response sequence to the Host
6. Awaits terminal disconnection
7. Teardowns the tinyUSB driver via esp-tinyusb wrapper
8. Repeats the steps from the step.1 4 times
9. Verify amount of attempts and memory leakage

command sequence[] = ep_size * 0xAA
response sequence[] = ep_size * 0x55

Hint: Values 0xAA and 0x55 were selected to verify the buffer memory integrity, as the 0xAA and 0x55 are the inversion of each other and the data bits in the same position changes from 1 to 0 in every transaction.

ep_size = 64 (S2/S3) and 512 (P4)

Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

[peter-marcisovsky]

Suggested change

	for (int i = 0; i < TEARDOWN_CMD_RPL_SIZE; i++) {
	TEST_ASSERT_EQUAL(TEARDOWN_CMD_KEY, rx_buf[i]);
	}
	TEST_ASSERT_EACH_EQUAL_UINT8(TEARDOWN_CMD_KEY, rx_buf, TEARDOWN_CMD_RPL_SIZE);

You can use EACH_EQUAL macro to compare an array to a single value

[roma-jam]

Thanks for the idea!

[peter-marcisovsky]

Suggested change

	vSemaphoreDelete(wait_command);
	vSemaphoreDelete(wait_command);
	vSemaphoreDelete(wait_terminal);

Delete also the wait_terminal semaphore.

[peter-marcisovsky]

Suggested change

	def test_usb_teardown_device(dut) -> None:
	def test_usb_teardown_device(dut: IdfDut) -> None:

I don't know if you are using some linting extension in VSCode, (I am using Pylint), It will give you some information and corrections about coding style.

This suggestion also comes from Pylint.

[peter-marcisovsky]

Suggested change

	TUSB_PID = 0x4002 # Espressif TinyUSB VID
	TUSB_PID = 0x4002 # Espressif TinyUSB PID

[peter-marcisovsky]

Suggested change

	# Command to send and expected response
	# Command to send an expected response

Or Command to send and expect response

[roma-jam]

@peter-marcisovsky Thanks for the review, I will apply all the notes.
But I don't think that this test is worth adding, as it is quite unstable yet and I don't know the reasons why so.
Also, I didn't solve the problem with your host, when the test just stops after first iteration.
So, lets keep this changes as a draft for a moment and return (*maybe) to them later.