Files
localthings/tests/test_subdevices.py
T
Marc Billow 9e85395b44 rename: unit/sub-unit -> subdevice, matching OCF terminology
"Unit"/"sub-unit" from #199's multi-indoor-device support wasn't OCF
idiomatic -- OCF calls each component of a composite device a
"subdevice" (see subdeviceIdList), so rename SubUnit -> Subdevice
throughout: the registry module, coordinator state, BoundEntity's
subdevice field, diagnostics keys (subdevices/subdevices_skipped/
subdevice_probes), entity unique_id prefixes (unit1_/sub_<uuid>_ ->
subdevice1_/subdevice_<uuid>_), device-name fallback labels, golden
fixtures, tests, README, and the adding-device-support skill.

Breaking change to entity unique_ids and diagnostics keys, acceptable
since this hasn't been released yet.
2026-07-29 22:57:11 +00:00

582 lines
24 KiB
Python

"""Tests for registry/subdevices.py -- multi-indoor-subdevice ("composite
device") support, issue #177. See DESIGN-177.md for the two board patterns
(`ARTIK051_DONGLE_FAC_18K`'s indexed siblings, `TP2X_FAC_BORA_21K`'s
UUID-prefixed tree) this module unifies.
"""
from __future__ import annotations
import cbor2
from custom_components.localthings.registry.capability import Capability
from custom_components.localthings.registry.entities import BinarySensorDesc, SensorDesc
from custom_components.localthings.registry.subdevices import (
MAIN, Subdevice, canonical_view, discover_partitioned, enumerate_subdevices,
normalize_seed_batch,
)
_UUID = '6c2dff6d-ee5c-dad1-6a5e-000000000001'
def _indexed(n: str) -> Subdevice:
return Subdevice(kind='indexed', key=n, seed_path=('device', n))
def _prefixed(sub_id: str) -> Subdevice:
return Subdevice(kind='prefixed', key=sub_id, seed_path=(sub_id, 'device', '0'))
# ---------------------------------------------------------------------------
# Subdevice.to_actual / to_canonical / owns / key_prefix
# ---------------------------------------------------------------------------
class TestMainIsIdentity:
def test_to_actual_unchanged(self):
assert MAIN.to_actual('/mode/vs/0') == '/mode/vs/0'
def test_to_canonical_unchanged(self):
assert MAIN.to_canonical('/mode/vs/0') == '/mode/vs/0'
def test_owns_is_always_false(self):
"""MAIN never "owns" a href by this definition -- it gets whatever's
left after every other subdevice's hrefs are excluded (canonical_view)."""
assert MAIN.owns('/mode/vs/0') is False
assert MAIN.owns('/mode/vs/1') is False
def test_key_prefix_is_empty(self):
"""The master's flattened state keys must stay byte-identical
to every device shipped before issue #177 -- see adapter._key."""
assert MAIN.key_prefix == ''
class TestIndexedTransform:
def test_to_actual_rewrites_trailing_zero(self):
subdevice = _indexed('1')
assert subdevice.to_actual('/mode/vs/0') == '/mode/vs/1'
assert subdevice.to_actual('/device/0') == '/device/1'
def test_to_actual_leaves_non_zero_trailing_segment_alone(self):
"""Deliberately not a "replace any trailing digit" rule -- a genuine
multi-instance resource (the fridge's pattern-cap hrefs, e.g.
'/door/vs/1') must not be misread as a subdevice's own href."""
subdevice = _indexed('1')
assert subdevice.to_actual('/door/vs/1') == '/door/vs/1'
def test_to_canonical_round_trips(self):
subdevice = _indexed('1')
assert subdevice.to_canonical(subdevice.to_actual('/mode/vs/0')) == '/mode/vs/0'
def test_to_canonical_rejects_wrong_index(self):
subdevice = _indexed('1')
assert subdevice.to_canonical('/mode/vs/2') is None
def test_to_canonical_rejects_index_zero(self):
"""Index 0 belongs to MAIN, never to an indexed subdevice."""
subdevice = _indexed('1')
assert subdevice.to_canonical('/mode/vs/0') is None
def test_owns(self):
subdevice = _indexed('1')
assert subdevice.owns('/mode/vs/1') is True
assert subdevice.owns('/mode/vs/0') is False
assert subdevice.owns('/mode/vs/2') is False
def test_key_prefix(self):
assert _indexed('1').key_prefix == 'subdevice1_'
assert _indexed('2').key_prefix == 'subdevice2_'
class TestPrefixedTransform:
def test_to_actual_prepends_id(self):
subdevice = _prefixed(_UUID)
assert subdevice.to_actual('/mode/vs/0') == f'/{_UUID}/mode/vs/0'
def test_to_canonical_round_trips(self):
subdevice = _prefixed(_UUID)
assert subdevice.to_canonical(subdevice.to_actual('/mode/vs/0')) == '/mode/vs/0'
def test_to_canonical_rejects_missing_prefix(self):
subdevice = _prefixed(_UUID)
assert subdevice.to_canonical('/mode/vs/0') is None
def test_to_canonical_requires_path_boundary(self):
"""A different, longer id that merely starts with the same
characters must not be mistaken for this one's own href."""
subdevice = _prefixed(_UUID)
assert subdevice.to_canonical(f'/{_UUID}extra/mode/vs/0') is None
def test_owns(self):
subdevice = _prefixed(_UUID)
assert subdevice.owns(f'/{_UUID}/mode/vs/0') is True
assert subdevice.owns('/mode/vs/0') is False
def test_key_prefix_strips_non_alphanumerics(self):
assert _prefixed(_UUID).key_prefix == 'subdevice_6c2dff6dee5cdad16a5e000000000001_'
# ---------------------------------------------------------------------------
# canonical_view
# ---------------------------------------------------------------------------
class TestCanonicalView:
def test_main_with_no_subdevices_is_unchanged(self):
resources = {'/mode/vs/0': {'a': 1}, '/power/vs/0': {'b': 2}}
assert canonical_view(MAIN, resources, []) == resources
def test_main_excludes_subdevice_owned_hrefs(self):
"""A sibling's own /mode/vs/1 must not leak into the master's
canonical /mode/vs/0 view -- otherwise exists_fn/is_legacy_board
checks that scan the whole dict would see two subdevices' state mixed
together under one key."""
resources = {
'/mode/vs/0': {'unit': 'main'},
'/mode/vs/1': {'unit': 'sibling'},
}
sub1 = _indexed('1')
view = canonical_view(MAIN, resources, [sub1])
assert view == {'/mode/vs/0': {'unit': 'main'}}
def test_indexed_view_is_rewritten_to_canonical_hrefs(self):
resources = {
'/mode/vs/0': {'unit': 'main'},
'/mode/vs/1': {'unit': 'sibling'},
'/power/vs/1': {'p': 'On'},
}
sub1 = _indexed('1')
view = canonical_view(sub1, resources, [sub1])
assert view == {
'/mode/vs/0': {'unit': 'sibling'},
'/power/vs/0': {'p': 'On'},
}
def test_prefixed_view_is_rewritten_to_canonical_hrefs(self):
resources = {
f'/{_UUID}/mode/vs/0': {'unit': 'sub'},
'/mode/vs/0': {'unit': 'main'},
}
subdevice = _prefixed(_UUID)
view = canonical_view(subdevice, resources, [subdevice])
assert view == {'/mode/vs/0': {'unit': 'sub'}}
def test_including_main_in_subdevices_is_harmless(self):
"""MAIN.owns() is always False, so passing the full roster
(including MAIN itself) to canonical_view must not change anything."""
resources = {'/mode/vs/0': {'unit': 'main'}, '/mode/vs/1': {'unit': 'sib'}}
sub1 = _indexed('1')
assert (canonical_view(MAIN, resources, [MAIN, sub1])
== canonical_view(MAIN, resources, [sub1]))
# ---------------------------------------------------------------------------
# normalize_seed_batch
# ---------------------------------------------------------------------------
def test_normalize_seed_batch_indexed_is_a_no_op():
subdevice = _indexed('1')
batch = {'/mode/vs/1': {'a': 1}}
assert normalize_seed_batch(subdevice, batch) == batch
def test_normalize_seed_batch_prefixed_adds_missing_prefix():
subdevice = _prefixed(_UUID)
batch = {'/mode/vs/0': {'a': 1}}
assert normalize_seed_batch(subdevice, batch) == {f'/{_UUID}/mode/vs/0': {'a': 1}}
def test_normalize_seed_batch_prefixed_leaves_already_prefixed_alone():
subdevice = _prefixed(_UUID)
batch = {f'/{_UUID}/mode/vs/0': {'a': 1}}
assert normalize_seed_batch(subdevice, batch) == batch
# ---------------------------------------------------------------------------
# enumerate_subdevices
# ---------------------------------------------------------------------------
class _FakeSession:
"""path-tuple -> raw batch list, cbor-encoded on GET -- same shape as
test_identity.py's FakeSession, extended to serve Collection batches
(a CBOR list), not just a bare Property map."""
def __init__(self, table):
self.table = table
def get(self, path, timeout=10.0):
body = self.table.get(tuple(path))
if body is None:
return 0x84, b''
return 0x45, cbor2.dumps(body)
_DEVCOL_REP = {'rt': ['x.com.samsung.devcol', 'oic.wk.col']}
def test_enumerate_indexed_from_oic_res_links():
oic_res = [{'di': 'aaaa', 'links': [
{'href': '/device/0'}, {'href': '/device/1'}, {'href': '/device/2'},
]}]
sess = _FakeSession({
('device', '1'): [_DEVCOL_REP, {'href': '/mode/vs/1', 'rep': {'m': 1}}],
('device', '2'): [_DEVCOL_REP, {'href': '/mode/vs/2', 'rep': {'m': 2}}],
})
subdevices, extra = enumerate_subdevices(sess, {}, oic_res)
assert sorted((u.kind, u.key) for u in subdevices) == [
('indexed', '1'), ('indexed', '2'),
]
assert extra == {'/mode/vs/1': {'m': 1}, '/mode/vs/2': {'m': 2}}
def test_enumerate_indexed_falls_back_to_speculative_probe_when_oic_res_hides_the_tree():
"""A board whose /oic/res doesn't reveal a second logical Device (e.g.
it hides the whole tree, TP2X_FAC_BORA_21K-style) falls back to probing
/device/1 and /device/2 directly -- the same bound the old
identity.py-level probe used."""
sess = _FakeSession({
('device', '1'): [_DEVCOL_REP, {'href': '/mode/vs/1', 'rep': {'m': 1}}],
# /device/2 not in the table -> 4.04 -> not materialized.
})
subdevices, extra = enumerate_subdevices(sess, {}, oic_res_links=[])
assert [(u.kind, u.key) for u in subdevices] == [('indexed', '1')]
assert extra == {'/mode/vs/1': {'m': 1}}
def test_enumerate_indexed_only_materializes_subdevices_with_a_non_empty_batch():
"""Per issue #177's design call: any seed that answers with a non-empty
batch is materialized, but an empty ({}) answer is not -- no separate
"is this subdevice real" gate."""
sess = _FakeSession({}) # neither /device/1 nor /device/2 answers
subdevices, extra = enumerate_subdevices(sess, {}, oic_res_links=[])
assert subdevices == []
assert extra == {}
def test_enumerate_prefixed_from_subdevice_id_list():
resources = {
'/subdevices/vs/0': {'x.com.samsung.da.subdeviceIdList': [_UUID]},
}
sess = _FakeSession({
(_UUID, 'device', '0'): [
_DEVCOL_REP, {'href': '/mode/vs/0', 'rep': {'m': 'cool'}},
],
})
subdevices, extra = enumerate_subdevices(sess, resources, oic_res_links=[])
assert [(u.kind, u.key) for u in subdevices] == [('prefixed', _UUID)]
# Batch echoed the bare (unprefixed) href -- normalized to carry the id.
assert extra == {f'/{_UUID}/mode/vs/0': {'m': 'cool'}}
def test_enumerate_prefixed_tolerates_redacted_string_id_list():
"""subdeviceIdList matches redact.py's 'deviceid' substring rule, and the
real airconditioner_fac_bora_device.json fixture carries the literal
redacted string there -- this must yield zero subdevices, not crash."""
resources = {
'/subdevices/vs/0': {'x.com.samsung.da.subdeviceIdList': 'REDACTED'},
}
subdevices, extra = enumerate_subdevices(_FakeSession({}), resources, oic_res_links=[])
assert subdevices == []
assert extra == {}
def test_enumerate_no_subdevices_resource_at_all():
subdevices, extra = enumerate_subdevices(_FakeSession({}), {}, oic_res_links=[])
assert subdevices == []
assert extra == {}
def test_enumerate_indexed_materializes_candidate_regardless_of_content():
"""enumerate_subdevices itself has no way to tell a real sibling from an
unused slot that merely answers the same shape (HJcom's /device/2) --
that's discover_partitioned's job (see its own tests below). A
same-shaped batch of otherwise-empty reps is still returned as a
candidate here."""
oic_res = [{'di': 'a', 'links': [{'href': '/device/2'}]}]
sess = _FakeSession({
('device', '2'): [_DEVCOL_REP, {'href': '/power/vs/2', 'rep': {}},
{'href': '/configuration/vs/2', 'rep': {'region': '123'}}],
})
subdevices, extra = enumerate_subdevices(sess, {}, oic_res)
assert [(u.kind, u.key) for u in subdevices] == [('indexed', '2')]
assert extra == {'/power/vs/2': {}, '/configuration/vs/2': {'region': '123'}}
def test_enumerate_probe_log_reports_every_attempt():
oic_res = [{'di': 'aaaa', 'links': [{'href': '/device/1'}]}]
sess = _FakeSession({
('device', '1'): [_DEVCOL_REP, {'href': '/mode/vs/1', 'rep': {'m': 1}}],
})
probes: dict[str, bool] = {}
enumerate_subdevices(sess, {}, oic_res, probe_log=probes.__setitem__)
# /multidevice/vs/0 is always probed too (issue #177 follow-up) -- not
# in this session's table, so it reports "checked, nothing there".
assert probes == {'/device/1': True, '/multidevice/vs/0': False}
def test_enumerate_probe_log_reports_empty_answers_too():
"""Distinguishes "checked, nothing there" from "never checked" (the
posture the speculative-probe code this replaced used to document
directly in identity.py)."""
probes: dict[str, bool] = {}
enumerate_subdevices(_FakeSession({}), {}, oic_res_links=[], probe_log=probes.__setitem__)
assert probes == {
'/device/1': False, '/device/2': False, '/multidevice/vs/0': False,
}
def test_enumerate_multidevice_vs_0_is_captured_for_diagnostics_not_a_gate():
"""/multidevice/vs/0 (issue #177 follow-up) is corroborating evidence
only -- captured into the merged resources so diagnostics can report
it, never consulted by the liveness gate itself."""
sess = _FakeSession({
('multidevice', 'vs', '0'): {'x.com.samsung.da.numofsubdevice': '2'},
})
subdevices, extra = enumerate_subdevices(sess, {}, oic_res_links=[])
assert subdevices == [] # no /device/<n> or subdevice id answered
assert extra == {
'/multidevice/vs/0': {'x.com.samsung.da.numofsubdevice': '2'},
}
def test_enumerate_both_patterns_checked_independently():
"""No board needs disambiguation logic -- enumeration just checks both
signals and takes whatever answers."""
resources = {
'/subdevices/vs/0': {'x.com.samsung.da.subdeviceIdList': [_UUID]},
}
oic_res = [{'di': 'a', 'links': [{'href': '/device/1'}]}]
sess = _FakeSession({
(_UUID, 'device', '0'): [_DEVCOL_REP, {'href': '/mode/vs/0', 'rep': {'m': 1}}],
('device', '1'): [_DEVCOL_REP, {'href': '/mode/vs/1', 'rep': {'m': 2}}],
})
subdevices, extra = enumerate_subdevices(sess, resources, oic_res)
assert sorted((u.kind, u.key) for u in subdevices) == [
('indexed', '1'), ('prefixed', _UUID),
]
# ---------------------------------------------------------------------------
# discover_partitioned
# ---------------------------------------------------------------------------
class _FakeRegistry:
def __init__(self, name, capabilities, pattern_capabilities=()):
self.name = name
self.capabilities = capabilities
self.pattern_capabilities = list(pattern_capabilities)
def test_discover_partitioned_binds_main_and_subdevice_separately():
mode_cap = Capability(
href='/mode/vs/0',
entities=(BinarySensorDesc(key='mode', field='m'),),
)
registry = {'/mode/vs/0': [mode_cap]}
reg = _FakeRegistry('airconditioner', registry)
sub1 = _indexed('1')
resources = {
'/mode/vs/0': {'m': 'main'},
'/mode/vs/1': {'m': 'sibling'},
}
def resolve(_resources):
return reg
bound, device_type_name, materialized, skipped = discover_partitioned(
resources, [sub1], resolve, fallback_capabilities={},
)
assert device_type_name == 'airconditioner'
assert materialized == [sub1]
assert skipped == []
by_href = {b.href: b for b in bound}
assert set(by_href) == {'/mode/vs/0', '/mode/vs/1'}
assert by_href['/mode/vs/0'].subdevice == MAIN
assert by_href['/mode/vs/1'].subdevice == sub1
def test_discover_partitioned_main_pass_excludes_subdevice_hrefs_from_unbound():
"""A subdevice's own /mode/vs/1 must not land in the main pass's unbound
list -- otherwise it raises a spurious coverage-gap repair for a href
nothing in the main registry claims literally, even though the *same*
canonical /mode/vs/0 href is properly claimed for both subdevices.
A registry that binds /mode/vs/0 (so both the main pass and the
subdevice pass over their own canonical views have something to claim
it) makes this unambiguous: if partitioning were broken -- e.g. the
main pass iterating unfiltered `resources` instead of `main_view` --
/mode/vs/1 would show up in `unbound` because nothing in the registry
is keyed on the literal string '/mode/vs/1'. With correct partitioning
the main pass never sees that href at all (canonical_view excludes it),
and the subdevice pass resolves it via its own canonical '/mode/vs/0'."""
cap = Capability(href='/mode/vs/0', entities=(BinarySensorDesc(key='mode', field='m'),))
reg = _FakeRegistry('airconditioner', {'/mode/vs/0': [cap]})
sub1 = _indexed('1')
resources = {
'/mode/vs/0': {'m': 'main'},
'/mode/vs/1': {'m': 'sibling'},
}
unbound = []
discover_partitioned(
resources, [sub1], lambda r: reg, fallback_capabilities={},
log=unbound.append,
)
assert unbound == []
def test_discover_partitioned_subdevice_resolves_its_own_registry():
"""A subdevice reporting its own /information/vs/0 resolves its own
device type (jhkwon19's wall subdevice: TP2X_FAC_BORA_RAC_21K -> RAC ->
airconditioner) independent of the master's."""
main_cap = Capability(href='/mode/vs/0', entities=(BinarySensorDesc(key='m', field='x'),))
sub_cap = Capability(href='/mode/vs/0', entities=(BinarySensorDesc(key='m2', field='x'),))
main_reg = _FakeRegistry('main_type', {'/mode/vs/0': [main_cap]})
sub_reg = _FakeRegistry('sub_type', {'/mode/vs/0': [sub_cap]})
sub1 = _indexed('1')
resources = {'/mode/vs/0': {'x': 1}, '/mode/vs/1': {'x': 2}}
def resolve(view):
# The subdevice's canonical view is exactly {'/mode/vs/0': {'x': 2}}.
return sub_reg if view.get('/mode/vs/0', {}).get('x') == 2 else main_reg
bound, device_type_name, materialized, skipped = discover_partitioned(
resources, [sub1], resolve, fallback_capabilities={},
)
assert device_type_name == 'main_type'
assert materialized == [sub1]
assert skipped == []
keys = {(b.href, b.desc.key) for b in bound}
assert ('/mode/vs/0', 'm') in keys
assert ('/mode/vs/1', 'm2') in keys
def test_discover_partitioned_subdevice_falls_back_to_master_registry():
"""A subdevice that reports no identity of its own resolves through the
master's registry instead of the global fallback -- the master itself
must actually resolve here (it reports /information/vs/0), or there is
no master registry for the fallback to reach for."""
cap = Capability(href='/mode/vs/0', entities=(BinarySensorDesc(key='m', field='x'),))
main_reg = _FakeRegistry('airconditioner', {'/mode/vs/0': [cap]})
sub1 = _indexed('1')
resources = {
'/information/vs/0': {'model': 'main'},
'/mode/vs/0': {'x': 1},
'/mode/vs/1': {'x': 2},
}
def resolve(view):
return main_reg if view.get('/information/vs/0') else None
bound, _, materialized, skipped = discover_partitioned(
resources, [sub1], resolve, fallback_capabilities={},
)
assert materialized == [sub1]
assert skipped == []
hrefs = {b.href for b in bound}
assert '/mode/vs/1' in hrefs
def test_discover_partitioned_no_subdevices_matches_plain_discover():
"""For a device with no subdevices this must be exactly the single
discover() call it replaces -- the hard regression guard the whole
design exists to protect."""
from custom_components.localthings.registry.discovery import discover
cap = Capability(href='/mode/vs/0', entities=(BinarySensorDesc(key='m', field='x'),))
reg = _FakeRegistry('airconditioner', {'/mode/vs/0': [cap]})
resources = {'/mode/vs/0': {'x': 1}}
bound_via_helper, _, materialized, skipped = discover_partitioned(
resources, [], lambda r: reg, fallback_capabilities={},
)
bound_direct = discover(resources, reg.capabilities, reg.pattern_capabilities)
assert bound_via_helper == bound_direct
assert materialized == []
assert skipped == []
# ---------------------------------------------------------------------------
# discover_partitioned's materialization gate: a candidate is only kept if
# it produced at least one *primary* (no entity_category) bound entity whose
# flattened value isn't None. This is what tells HJcom's real /device/1
# sibling apart from the unused /device/2 slot that answers the same shape.
# ---------------------------------------------------------------------------
def test_discover_partitioned_skips_candidate_with_no_live_primary_entity():
"""A candidate whose only populated entity is diagnostic-category
doesn't count -- exactly HJcom's /device/2 shape (an alarm_code
sensor reading something even though the subdevice itself is empty)."""
diag_cap = Capability(
href='/alarms/vs/0',
entities=(SensorDesc(key='alarm_code', field='code', entity_category='diagnostic'),),
)
reg = _FakeRegistry('airconditioner', {'/alarms/vs/0': [diag_cap]})
unit2 = _indexed('2')
resources = {
'/alarms/vs/0': {'code': 'main-alarm'},
'/alarms/vs/2': {'code': 'ErrorCode_OFF'}, # populated, but diagnostic-only
}
bound, _, materialized, skipped = discover_partitioned(
resources, [unit2], lambda r: reg, fallback_capabilities={},
)
assert materialized == []
assert len(skipped) == 1
assert skipped[0].subdevice == unit2
assert skipped[0].hrefs == ('/alarms/vs/2',)
# The candidate contributes nothing at all -- not even its diagnostic
# entity -- once skipped.
assert all(b.subdevice != unit2 for b in bound)
def test_discover_partitioned_materializes_candidate_with_live_primary_entity():
"""A candidate with a populated *primary* (no entity_category) entity
is materialized, even alongside an all-empty diagnostic sibling href --
exactly HJcom's /device/1 shape."""
climate_cap = Capability(
href='/mode/vs/0',
entities=(BinarySensorDesc(key='mode', field='m'),), # no entity_category -> primary
)
diag_cap = Capability(
href='/alarms/vs/0',
entities=(SensorDesc(key='alarm_code', field='code', entity_category='diagnostic'),),
)
reg = _FakeRegistry(
'airconditioner', {'/mode/vs/0': [climate_cap], '/alarms/vs/0': [diag_cap]},
)
sub1 = _indexed('1')
resources = {
'/mode/vs/0': {'m': 'main'},
'/alarms/vs/0': {'code': 'main-alarm'},
'/mode/vs/1': {'m': 'Cool'},
'/alarms/vs/1': {}, # empty -- not what makes this subdevice live
}
bound, _, materialized, skipped = discover_partitioned(
resources, [sub1], lambda r: reg, fallback_capabilities={},
)
assert materialized == [sub1]
assert skipped == []
hrefs = {b.href for b in bound if b.subdevice == sub1}
assert hrefs == {'/mode/vs/1', '/alarms/vs/1'}
def test_discover_partitioned_skipped_candidate_contributes_no_hot_warm_hrefs():
"""A skipped candidate's hrefs must not appear via tier_log either --
'no entities, no hot/warm hrefs' (the skip is total, not just
entity-level)."""
cap = Capability(href='/mode/vs/0', poll_tier='warm',
entities=(SensorDesc(key='alarm_code', field='code',
entity_category='diagnostic'),))
reg = _FakeRegistry('airconditioner', {'/mode/vs/0': [cap]})
unit2 = _indexed('2')
resources = {'/mode/vs/0': {'code': 'x'}, '/mode/vs/2': {'code': 'y'}}
tiers = []
discover_partitioned(
resources, [unit2], lambda r: reg, fallback_capabilities={},
tier_log=lambda href, tier: tiers.append(href),
)
assert '/mode/vs/2' not in tiers