add test vtx embedding

litellm/proxy/tests/test_vtx_embedding.py

@@ -0,0 +1,21 @@
+import openai
+
+client = openai.OpenAI(api_key="sk-1234", base_url="http://0.0.0.0:4000")
+
+# # request sent to model set on litellm proxy, `litellm --model`
+response = client.embeddings.create(
+    model="multimodalembedding@001",
+    input=[],
+    extra_body={
+        "instances": [
+            {
+                "image": {
+                    "gcsUri": "gs://cloud-samples-data/vertex-ai/llm/prompts/landmark1.png"
+                },
+                "text": "this is a unicorn",
+            },
+        ],
+    },
+)
+
+print(response)