diff --git a/tests/test_router_cooldown_edge_cases.py b/tests/test_router_cooldown_edge_cases.py
new file mode 100644
index 00000000000..20757ffbaa2
--- /dev/null
+++ b/tests/test_router_cooldown_edge_cases.py
@@ -0,0 +1,51 @@
+import pytest
+import time
+from litellm import Router
+
+def test_router_model_list_initialization():
+    model_list = [
+        {
+            "model_name": "gpt-4",
+            "litellm_params": {
+                "model": "azure/gpt-4-east",
+                "api_key": "test-key-1",
+                "api_base": "https://test.azure.com",
+            },
+        },
+        {
+            "model_name": "gpt-4",
+            "litellm_params": {
+                "model": "azure/gpt-4-west",
+                "api_key": "test-key-2",
+                "api_base": "https://test.azure.com",
+            },
+        },
+    ]
+    
+    router = Router(model_list=model_list)
+    assert len(router.model_list) == 2
+    assert router.model_list[0]["model_name"] == "gpt-4"
+    assert router.model_list[1]["model_name"] == "gpt-4"
+
+def test_router_cooldown_time_assignment():
+    router = Router(
+        model_list=[
+            {
+                "model_name": "gpt-3.5-turbo",
+                "litellm_params": {"model": "gpt-3.5-turbo", "api_key": "test-key"},
+            }
+        ],
+        cooldown_time=45,
+    )
+    assert router.cooldown_time == 45
+
+def test_router_get_model_group_names():
+    router = Router(
+        model_list=[
+            {"model_name": "claude-3-haiku", "litellm_params": {"model": "bedrock/claude-3-haiku"}},
+            {"model_name": "claude-3-sonnet", "litellm_params": {"model": "bedrock/claude-3-sonnet"}},
+        ]
+    )
+    model_names = [m["model_name"] for m in router.model_list]
+    assert "claude-3-haiku" in model_names
+    assert "claude-3-sonnet" in model_names
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