refactor: move all testing to top-level of repo

Closes https://github.com/BerriAI/litellm/issues/486

tests/local_testing/test_spend_calculate_endpoint.py

@@ -0,0 +1,141 @@
+import os
+import sys
+
+import pytest
+from dotenv import load_dotenv
+from fastapi import Request
+from fastapi.routing import APIRoute
+
+import litellm
+from litellm.proxy._types import SpendCalculateRequest
+from litellm.proxy.spend_tracking.spend_management_endpoints import calculate_spend
+from litellm.router import Router
+
+# this file is to test litellm/proxy
+
+sys.path.insert(
+    0, os.path.abspath("../..")
+)  # Adds the parent directory to the system path
+
+
+@pytest.mark.asyncio
+async def test_spend_calc_model_messages():
+    cost_obj = await calculate_spend(
+        request=SpendCalculateRequest(
+            model="gpt-3.5-turbo",
+            messages=[
+                {"role": "user", "content": "What is the capital of France?"},
+            ],
+        )
+    )
+
+    print("calculated cost", cost_obj)
+    cost = cost_obj["cost"]
+    assert cost > 0.0
+
+
+@pytest.mark.asyncio
+async def test_spend_calc_model_on_router_messages():
+    from litellm.proxy.proxy_server import llm_router as init_llm_router
+
+    temp_llm_router = Router(
+        model_list=[
+            {
+                "model_name": "special-llama-model",
+                "litellm_params": {
+                    "model": "groq/llama3-8b-8192",
+                },
+            }
+        ]
+    )
+
+    setattr(litellm.proxy.proxy_server, "llm_router", temp_llm_router)
+
+    cost_obj = await calculate_spend(
+        request=SpendCalculateRequest(
+            model="special-llama-model",
+            messages=[
+                {"role": "user", "content": "What is the capital of France?"},
+            ],
+        )
+    )
+
+    print("calculated cost", cost_obj)
+    _cost = cost_obj["cost"]
+
+    assert _cost > 0.0
+
+    # set router to init value
+    setattr(litellm.proxy.proxy_server, "llm_router", init_llm_router)
+
+
+@pytest.mark.asyncio
+async def test_spend_calc_using_response():
+    cost_obj = await calculate_spend(
+        request=SpendCalculateRequest(
+            completion_response={
+                "id": "chatcmpl-3bc7abcd-f70b-48ab-a16c-dfba0b286c86",
+                "choices": [
+                    {
+                        "finish_reason": "stop",
+                        "index": 0,
+                        "message": {
+                            "content": "Yooo! What's good?",
+                            "role": "assistant",
+                        },
+                    }
+                ],
+                "created": "1677652288",
+                "model": "groq/llama3-8b-8192",
+                "object": "chat.completion",
+                "system_fingerprint": "fp_873a560973",
+                "usage": {
+                    "completion_tokens": 8,
+                    "prompt_tokens": 12,
+                    "total_tokens": 20,
+                },
+            }
+        )
+    )
+
+    print("calculated cost", cost_obj)
+    cost = cost_obj["cost"]
+    assert cost > 0.0
+
+
+@pytest.mark.asyncio
+async def test_spend_calc_model_alias_on_router_messages():
+    from litellm.proxy.proxy_server import llm_router as init_llm_router
+
+    temp_llm_router = Router(
+        model_list=[
+            {
+                "model_name": "gpt-4o",
+                "litellm_params": {
+                    "model": "gpt-4o",
+                },
+            }
+        ],
+        model_group_alias={
+            "gpt4o": "gpt-4o",
+        },
+    )
+
+    setattr(litellm.proxy.proxy_server, "llm_router", temp_llm_router)
+
+    cost_obj = await calculate_spend(
+        request=SpendCalculateRequest(
+            model="gpt4o",
+            messages=[
+                {"role": "user", "content": "What is the capital of France?"},
+            ],
+        )
+    )
+
+    print("calculated cost", cost_obj)
+    _cost = cost_obj["cost"]
+
+    assert _cost > 0.0
+
+    # set router to init value
+    setattr(litellm.proxy.proxy_server, "llm_router", init_llm_router)