diff --git a/tests/test_litellm/router_utils/test_router_utils_common_utils.py b/tests/test_litellm/router_utils/test_router_utils_common_utils.py
index 8ff1ba45cc..587b6a97b5 100644
--- a/tests/test_litellm/router_utils/test_router_utils_common_utils.py
+++ b/tests/test_litellm/router_utils/test_router_utils_common_utils.py
@@ -3,6 +3,7 @@ from unittest.mock import Mock
 
 import pytest
 
+from litellm import Router
 from litellm.router_utils.common_utils import (
     _deployment_supports_web_search,
     filter_team_based_models,
@@ -340,3 +341,22 @@ class TestFilterWebSearchDeployments:
         result = filter_web_search_deployments(deployment, request_kwargs)
         # Should return the dict unchanged, not filter it
         assert result == deployment
+
+
+def test_invalidate_model_group_info_cache():
+    """Test that _invalidate_model_group_info_cache clears the LRU cache."""
+    router = Router(
+        model_list=[
+            {
+                "model_name": "gpt-4",
+                "litellm_params": {"model": "gpt-4", "api_key": "fake-key"},
+            }
+        ]
+    )
+    # Populate the cache
+    router._cached_get_model_group_info("gpt-4")
+    assert router._cached_get_model_group_info.cache_info().currsize > 0
+
+    # Invalidate and verify cache is cleared
+    router._invalidate_model_group_info_cache()
+    assert router._cached_get_model_group_info.cache_info().currsize == 0