diff --git a/tests/test_litellm/llms/vertex_ai/vertex_gemma_models/test_vertex_gemma_transformation.py b/tests/test_litellm/llms/vertex_ai/vertex_gemma_models/test_vertex_gemma_transformation.py
index 9fbeb78712e..bfa86647373 100644
--- a/tests/test_litellm/llms/vertex_ai/vertex_gemma_models/test_vertex_gemma_transformation.py
+++ b/tests/test_litellm/llms/vertex_ai/vertex_gemma_models/test_vertex_gemma_transformation.py
@@ -111,10 +111,13 @@ class TestVertexGemmaCompletion:
             },
         }
         
-        # Mock the async HTTP handler
+        # Mock the async HTTP handler and Vertex authentication
         with patch(
             "litellm.llms.custom_httpx.http_handler.AsyncHTTPHandler"
-        ) as mock_http_handler:
+        ) as mock_http_handler, patch(
+            "litellm.llms.vertex_ai.gemini.vertex_and_google_ai_studio_gemini.VertexLLM._ensure_access_token",
+            return_value=("fake-access-token", "PROJECT_ID")
+        ):
             mock_response = Mock()
             mock_response.status_code = 200
             mock_response.json.return_value = mock_vertex_response
@@ -197,7 +200,10 @@ class TestVertexGemmaCompletion:
         
         with patch(
             "litellm.llms.custom_httpx.http_handler.AsyncHTTPHandler"
-        ) as mock_http_handler:
+        ) as mock_http_handler, patch(
+            "litellm.llms.vertex_ai.gemini.vertex_and_google_ai_studio_gemini.VertexLLM._ensure_access_token",
+            return_value=("fake-access-token", "test-project")
+        ):
             mock_response = Mock()
             mock_response.status_code = 200
             mock_response.json.return_value = invalid_response
@@ -264,7 +270,10 @@ class TestVertexGemmaCompletion:
         
         with patch(
             "litellm.llms.custom_httpx.http_handler.get_async_httpx_client"
-        ) as mock_get_client:
+        ) as mock_get_client, patch(
+            "litellm.llms.vertex_ai.gemini.vertex_and_google_ai_studio_gemini.VertexLLM._ensure_access_token",
+            return_value=("fake-access-token", "PROJECT_ID")
+        ):
             mock_client = Mock()
             mock_response = Mock()
             mock_response.status_code = 200
@@ -354,7 +363,10 @@ class TestVertexGemmaCompletion:
         
         with patch(
             "litellm.llms.custom_httpx.http_handler.get_async_httpx_client"
-        ) as mock_get_client:
+        ) as mock_get_client, patch(
+            "litellm.llms.vertex_ai.gemini.vertex_and_google_ai_studio_gemini.VertexLLM._ensure_access_token",
+            return_value=("fake-access-token", "PROJECT_ID")
+        ):
             mock_client = Mock()
             mock_response = Mock()
             mock_response.status_code = 200