Add a testcase

Author: kayoch1n

tests/test_litellm/proxy/common_utils/test_callback_utils.py

@@ -0,0 +1,27 @@
+import sys
+import os
+
+sys.path.insert(
+    0, os.path.abspath("../../..")
+)  # Adds the parent directory to the system path
+
+from litellm.proxy.common_utils.callback_utils import get_remaining_tokens_and_requests_from_request_data
+
+def test_get_remaining_tokens_and_requests_from_request_data():
+    model_group = "openrouter/google/gemini-2.0-flash-001"
+    casedata = {
+        "metadata": {
+            "model_group": model_group,
+            f"litellm-key-remaining-requests-{model_group}": 100,
+            f"litellm-key-remaining-tokens-{model_group}": 200
+        }
+    }
+
+    headers = get_remaining_tokens_and_requests_from_request_data(casedata)
+
+    expected_name = "openrouter-google-gemini-2.0-flash-001"
+    assert headers == {
+        f"x-litellm-key-remaining-requests-{expected_name}": 100,
+        f"x-litellm-key-remaining-tokens-{expected_name}": 200
+    }
+