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test_smart_router.py
--------------------
Tests for the SmartRouter.
Run: pytest python/tests/test_smart_router.py -v
"""
import pytest
import asyncio
from unittest.mock import AsyncMock, MagicMock, patch
from smart_router import SmartRouter, Provider
# ── Fixtures ──────────────────────────────────────────────────────────────────
@pytest.fixture(autouse=True)
def fake_api_key(monkeypatch):
monkeypatch.setenv("FAKE_KEY", "test-key")
def make_provider(name, healthy=True, configured=True,
latency=100.0, cost=0.002, errors=0, requests=0):
p = Provider(
name=name,
ping_url=f"https://{name}.example.com/health",
api_key_env="FAKE_KEY",
cost_per_1k_tokens=cost,
big_model=f"{name}-big",
small_model=f"{name}-small",
)
p.healthy = healthy
p.avg_latency_ms = latency
p.error_count = errors
p.request_count = requests
if not configured:
p.api_key_env = "" # makes is_configured False for non-local providers
return p
def make_router(providers=None, strategy="balanced"):
r = SmartRouter(providers=providers, strategy=strategy)
r._initialized = True
return r
# ── Provider.score() ──────────────────────────────────────────────────────────
def test_score_unhealthy_is_inf():
p = make_provider("openai", healthy=False)
assert p.score() == float("inf")
def test_score_unconfigured_is_inf():
p = make_provider("openai", configured=False)
assert p.score() == float("inf")
def test_score_latency_strategy_prefers_faster():
fast = make_provider("fast", latency=50.0, cost=0.01)
slow = make_provider("slow", latency=500.0, cost=0.001)
assert fast.score("latency") < slow.score("latency")
def test_score_cost_strategy_prefers_cheaper():
cheap = make_provider("cheap", latency=500.0, cost=0.0001)
expensive = make_provider("expensive", latency=50.0, cost=0.05)
assert cheap.score("cost") < expensive.score("cost")
def test_score_balanced_strategy_uses_both():
p = make_provider("test", latency=200.0, cost=0.002)
s = p.score("balanced")
assert s > 0
def test_score_error_rate_penalty():
clean = make_provider("clean", errors=0, requests=10)
dirty = make_provider("dirty", errors=8, requests=10)
assert clean.score() < dirty.score()
# ── SmartRouter.is_large_request() ───────────────────────────────────────────
def test_is_large_request_short():
r = make_router()
msgs = [{"role": "user", "content": "Hello!"}]
assert r.is_large_request(msgs) is False
def test_is_large_request_long():
r = make_router()
msgs = [{"role": "user", "content": "x" * 3000}]
assert r.is_large_request(msgs) is True
# ── SmartRouter.select_provider() ────────────────────────────────────────────
def test_select_provider_picks_best_score():
p1 = make_provider("slow", latency=800.0)
p2 = make_provider("fast", latency=50.0)
r = make_router(providers=[p1, p2], strategy="latency")
selected = r.select_provider()
assert selected.name == "fast"
def test_select_provider_skips_unhealthy():
p1 = make_provider("bad", healthy=False)
p2 = make_provider("good", healthy=True)
r = make_router(providers=[p1, p2])
selected = r.select_provider()
assert selected.name == "good"
def test_select_provider_returns_none_when_all_down():
p1 = make_provider("a", healthy=False)
p2 = make_provider("b", healthy=False)
r = make_router(providers=[p1, p2])
assert r.select_provider() is None
# ── SmartRouter.get_model_for_provider() ─────────────────────────────────────
def test_get_model_large_request():
p = make_provider("openai")
r = make_router()
model = r.get_model_for_provider(p, "claude-sonnet")
assert model == "openai-big"
def test_get_model_large_message_overrides_claude_label():
p = make_provider("openai")
r = make_router()
model = r.get_model_for_provider(p, "claude-haiku", is_large_request=True)
assert model == "openai-big"
def test_get_model_small_request():
p = make_provider("openai")
r = make_router()
model = r.get_model_for_provider(p, "claude-haiku")
assert model == "openai-small"
# ── SmartRouter.route() ───────────────────────────────────────────────────────
@pytest.mark.asyncio
async def test_route_returns_best_provider():
p1 = make_provider("expensive", cost=0.05, latency=50.0)
p2 = make_provider("cheap", cost=0.0005, latency=200.0)
r = make_router(providers=[p1, p2], strategy="cost")
result = await r.route([{"role": "user", "content": "Hi"}], "claude-haiku")
assert result["provider"] == "cheap"
@pytest.mark.asyncio
async def test_route_uses_big_model_for_large_message_bodies():
p = make_provider("openai")
r = make_router(providers=[p])
result = await r.route([
{"role": "user", "content": "x" * 3001},
], "claude-haiku")
assert result["model"] == "openai-big"
@pytest.mark.asyncio
async def test_route_raises_when_no_providers():
p = make_provider("a", healthy=False)
r = make_router(providers=[p])
with pytest.raises(RuntimeError, match="no providers available"):
await r.route([{"role": "user", "content": "Hi"}])
@pytest.mark.asyncio
async def test_route_excludes_providers():
p1 = make_provider("openai", latency=50.0)
p2 = make_provider("gemini", latency=200.0)
r = make_router(providers=[p1, p2], strategy="latency")
result = await r.route(
[{"role": "user", "content": "Hi"}],
exclude_providers=["openai"]
)
assert result["provider"] == "gemini"
# ── SmartRouter.record_result() ──────────────────────────────────────────────
@pytest.mark.asyncio
async def test_record_result_updates_latency():
p = make_provider("openai", latency=200.0)
r = make_router(providers=[p])
await r.record_result("openai", success=True, duration_ms=100.0)
assert p.avg_latency_ms < 200.0 # should decrease toward 100
@pytest.mark.asyncio
async def test_record_result_increments_requests():
p = make_provider("openai")
r = make_router(providers=[p])
await r.record_result("openai", success=True, duration_ms=100.0)
assert p.request_count == 1
@pytest.mark.asyncio
async def test_record_result_increments_errors():
p = make_provider("openai")
r = make_router(providers=[p])
await r.record_result("openai", success=False, duration_ms=0)
assert p.error_count == 1
# ── SmartRouter.status() ─────────────────────────────────────────────────────
def test_status_returns_all_providers():
p1 = make_provider("openai")
p2 = make_provider("gemini")
r = make_router(providers=[p1, p2])
status = r.status()
assert len(status) == 2
names = [s["provider"] for s in status]
assert "openai" in names
assert "gemini" in names
def test_status_contains_required_fields():
p = make_provider("openai")
r = make_router(providers=[p])
status = r.status()[0]
for field in ["provider", "healthy", "latency_ms",
"cost_per_1k", "requests", "errors", "score"]:
assert field in status
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