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zephyr-cp tests: test_web_workflow_hw.py has a failing assertion, a circular xfail reason, and a tautological mDNS check #56

Description

@mikeysklar

Three problems in ports/zephyr-cp/tests/test_web_workflow_hw.py, found while running it against real hardware.

1. test_version_json_mdns_fields_populated fails and has no xfail.

It asserts both fields are non-empty:

assert payload["board_name"] != ""
assert payload["hostname"] != ""

Both are empty on hardware. See #55. This is a hard assertion, so the module fails.

2. The mDNS xfail reason cites that failing test as its own evidence.

test_mdns_hostname_resolves_over_network is marked xfail with the reason:

The responder itself is confirmed correctly configured -- see test_version_json_mdns_fields_populated and the Kconfig comment in boards/siwx917_dk2605a.conf.

That test does not pass, so the justification is circular. The AP-blocks-multicast explanation may still be right, but nothing in the module establishes it.

3. _mdns_query_a cannot fail for the reason the test claims.

if from_ip == BOARD_IP and len(data) > 12:
    return from_ip
...
resolved = _mdns_query_a(hostname)
assert resolved == BOARD_IP

The helper filters on from_ip == BOARD_IP and then returns from_ip, so the assertion is a tautology. The answer section is never parsed. It verifies that the board sent some multicast packet, not that <hostname>.local resolves. Combined with the xfail it can neither pass meaningfully nor fail.

Worth fixing before this module is proposed upstream.

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