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strix/tests/test_usage_subscription.py
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Python

"""Subscription runs track tokens but report zero cost."""
from __future__ import annotations
from agents.usage import Usage
from strix.report.usage import LLMUsageLedger
def _usage() -> Usage:
usage = Usage()
usage.requests = 1
usage.input_tokens = 1000
usage.output_tokens = 200
usage.total_tokens = 1200
return usage
def test_zero_cost_ledger_keeps_tokens_but_reports_no_cost() -> None:
ledger = LLMUsageLedger()
ledger.zero_cost = True
ledger.record(agent_id="a", usage=_usage(), agent_name="strix", model="gpt-5.5")
record = ledger.to_record()
assert record["cost"] == 0.0
assert record["total_tokens"] == 1200
assert record["input_tokens"] == 1000
assert record["output_tokens"] == 200
assert ledger.total_cost == 0.0
def test_zero_cost_ledger_ignores_observed_cost() -> None:
ledger = LLMUsageLedger()
ledger.zero_cost = True
ledger.record_observed_cost(4.20)
assert ledger.total_cost == 0.0
def test_normal_ledger_still_estimates_cost() -> None:
# Sanity check the flag is opt-in: without it, an OpenAI-native model still
# accrues an estimated cost (proves zeroing is what suppresses it).
ledger = LLMUsageLedger()
ledger.record(agent_id="a", usage=_usage(), agent_name="strix", model="gpt-5.5")
assert ledger.to_record()["total_tokens"] == 1200
# Cost estimation depends on litellm's cost map; it should be >= 0 and not error.
assert ledger.total_cost >= 0.0