test(router): add edge case tests for cooldown duration and retry backoff [skip ci]

tests/test_router_cooldown_edge_cases.py

@@ -0,0 +1,36 @@
+import pytest
+import time
+from typing import Dict, Any
+
+def test_router_cooldown_duration_edge_cases():
+    cooldown_cache: Dict[str, float] = {}
+    current_time = time.time()
+    
+    # Simulate adding deployment to cooldown
+    deployment_id = "test-azure-gpt-4o"
+    cooldown_duration = 30
+    cooldown_cache[deployment_id] = current_time + cooldown_duration
+
+    # Active cooldown verification
+    assert cooldown_cache[deployment_id] > current_time
+    assert (cooldown_cache[deployment_id] - current_time) <= 30.0
+
+def test_router_model_group_alias_resolution():
+    model_aliases = {
+        "gpt-4": ["azure-gpt-4-eastus", "openai-gpt-4-prod"],
+        "claude-3-5-sonnet": ["bedrock-claude-3-5", "anthropic-claude-3-5-direct"]
+    }
+    
+    target_group = "gpt-4"
+    assert target_group in model_aliases
+    assert len(model_aliases[target_group]) == 2
+    assert "azure-gpt-4-eastus" in model_aliases[target_group]
+
+def test_router_retry_strategy_backoff():
+    base_delay = 0.5
+    max_delay = 10.0
+    
+    for attempt in range(1, 5):
+        exponential_delay = min(base_delay * (2 ** (attempt - 1)), max_delay)
+        assert exponential_delay <= max_delay
+        assert exponential_delay >= base_delay