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from hypothesis import given, settings, strategies as st
from ctx.engine.protocol import EngineEvent, HostAction, ScopeRef
from ctx.engine.reducer import MAX_ACTIVE_CAPABILITIES, reduce
NOW = "2026-08-01T12:00:00Z"
SCOPE = ScopeRef(
tenant_id="tenant-property",
workspace_id="workspace-property",
repository_id="repository-property",
session_id="session-property",
exposure_id="exposure-property",
host_context_id="host-property",
)
def _event(
kind: str,
revision: int,
event_id: str,
payload: dict[str, object],
) -> EngineEvent:
return EngineEvent(
event_id=event_id,
kind=kind,
scope=SCOPE,
expected_revision=revision,
occurred_at=NOW,
payload=payload,
correlation_id="plan-property",
catalog_snapshot_digest="catalog-property",
host_descriptor_digest="host-property-v1",
engine_version="engine-property-v1",
planner_version="planner-property-v1",
policy_version="policy-property-v1",
semantic_model_digest="semantic-model-property-v1",
semantic_index_digest="semantic-index-property-v1",
work_signature="work-signature-property-v1",
random_seed=19,
)
def _receipt(state, action: HostAction, event_id: str, *, applied: bool):
payload: dict[str, object] = {
"action_id": action.action_id,
"action_kind": action.kind,
"action_content_digest": action.content_digest,
"action_precondition_revision": action.precondition_revision,
}
if applied:
payload["verification"] = {"host_state": action.verification["expected_state"]}
kind = "ActionApplied"
else:
payload["error"] = {"code": "generated-host-failure"}
kind = "ActionFailed"
return reduce(state, _event(kind, state.revision, event_id, payload))
@settings(max_examples=30, deadline=None)
@given(st.integers(min_value=0, max_value=12))
def test_requests_alone_never_activate_or_exceed_the_global_belt(size: int) -> None:
state, _ = reduce(
None,
_event(
"SessionStarted",
0,
"event-start",
{"host_level": "activating"},
),
)
desired = [
{
"capability_id": f"skill:capability-{index}",
"source_digest": f"digest-{index}",
"lease_id": f"lease-{index}",
}
for index in range(size)
]
state, transition = reduce(
state,
_event(
"ReassessmentRequested",
state.revision,
"event-desired",
{
"owner_id": "owner-property",
"desired_capabilities": desired,
},
),
)
assert state.active_capability_ids == frozenset()
assert (
len([action for action in transition.actions if action.kind == "ActivateCapability"])
<= MAX_ACTIVE_CAPABILITIES
)
@settings(max_examples=8, deadline=None)
@given(
child_shares_capability=st.booleans(),
replacement_fails=st.booleans(),
first_terminal_cleanup_fails=st.booleans(),
)
def test_generated_owner_receipt_replacement_and_terminal_interleavings(
child_shares_capability: bool,
replacement_fails: bool,
first_terminal_cleanup_fails: bool,
) -> None:
state, _ = reduce(
None,
_event(
"SessionStarted",
0,
"sequence-start",
{"host_level": "activating"},
),
)
original = [
{
"capability_id": f"skill:sequence-{index}",
"source_digest": f"digest-{index}",
"lease_id": f"lease-parent-{index}",
}
for index in range(5)
]
state, transition = reduce(
state,
_event(
"ReassessmentRequested",
state.revision,
"sequence-original",
{"owner_id": "parent", "desired_capabilities": original},
),
)
counter = 0
for action in transition.actions:
state, _ = _receipt(
state,
action,
f"sequence-initial-receipt-{counter}",
applied=True,
)
counter += 1
assert len(state.active_capability_ids) <= MAX_ACTIVE_CAPABILITIES
if child_shares_capability:
state, _ = reduce(
state,
_event(
"ReassessmentRequested",
state.revision,
"sequence-child",
{
"owner_id": "child",
"desired_capabilities": [
{
**original[1],
"lease_id": "lease-child-shared",
}
],
},
),
)
replacement = [
*original[1:],
{
"capability_id": "skill:sequence-new",
"source_digest": "digest-new",
"lease_id": "lease-new",
},
]
state, transition = reduce(
state,
_event(
"ReassessmentRequested",
state.revision,
"sequence-replacement",
{"owner_id": "parent", "desired_capabilities": replacement},
),
)
removal = next(action for action in transition.actions if action.kind == "DeactivateCapability")
state, transition = _receipt(
state,
removal,
"sequence-old-inactive",
applied=True,
)
addition = next(action for action in transition.actions if action.kind == "ActivateCapability")
state, transition = _receipt(
state,
addition,
"sequence-new-result",
applied=not replacement_fails,
)
if replacement_fails:
rollback = next(
action for action in transition.actions if action.kind == "ActivateCapability"
)
state, _ = _receipt(
state,
rollback,
"sequence-rollback-active",
applied=True,
)
assert len(state.active_capability_ids) <= MAX_ACTIVE_CAPABILITIES
state, transition = reduce(
state,
_event("SessionEnded", state.revision, "sequence-ended", {}),
)
initial_cleanup = next(
action for action in transition.actions if action.kind == "DeactivateCapability"
)
if first_terminal_cleanup_fails:
state, _ = _receipt(
state,
initial_cleanup,
"sequence-cleanup-failed",
applied=False,
)
state, transition = reduce(
state,
_event(
"ReassessmentRequested",
state.revision,
"sequence-cleanup-retry",
{"retry_failed_deactivations": [initial_cleanup.entity_id]},
),
)
cleanup: HostAction | None = next(
action for action in transition.actions if action.kind == "DeactivateCapability"
)
else:
cleanup = initial_cleanup
while cleanup is not None:
state, transition = _receipt(
state,
cleanup,
f"sequence-cleanup-applied-{counter}",
applied=True,
)
counter += 1
assert len(state.active_capability_ids) <= MAX_ACTIVE_CAPABILITIES
cleanup = next(
(action for action in transition.actions if action.kind == "DeactivateCapability"),
None,
)
assert state.active_capability_ids == frozenset()
|