fix tests

llms/mlx_lm/server.py

@@ -30,6 +30,13 @@ from .models.cache import make_prompt_cache
 from .utils import generate_step, load
 
 
+def get_system_fingerprint():
+    return (
+        f"{__version__}-{mx.__version__}-{platform.platform()}-"
+        f"{mx.metal.device_info().get('architecture', '')}"
+    )
+
+
 class StopCondition(NamedTuple):
     stop_met: bool
     trim_length: int
@@ -180,9 +187,9 @@ class APIHandler(BaseHTTPRequestHandler):
     def __init__(
         self,
         model_provider: ModelProvider,
-        prompt_cache: PromptCache,
-        system_fingerprint: str,
         *args,
+        prompt_cache: Optional[PromptCache] = None,
+        system_fingerprint: Optional[str] = None,
         **kwargs,
     ):
         """
@@ -190,8 +197,8 @@ class APIHandler(BaseHTTPRequestHandler):
         """
         self.created = int(time.time())
         self.model_provider = model_provider
-        self.prompt_cache = prompt_cache
-        self.system_fingerprint = system_fingerprint
+        self.prompt_cache = prompt_cache or PromptCache()
+        self.system_fingerprint = system_fingerprint or get_system_fingerprint()
         super().__init__(*args, **kwargs)
 
     def _set_cors_headers(self):
@@ -725,14 +732,14 @@ def run(
 ):
     server_address = (host, port)
     prompt_cache = PromptCache()
-    system_fingerprint = (
-        f"{__version__}-{mx.__version__}-{platform.platform()}-"
-        f"{mx.metal.device_info().get('architecture', '')}"
-    )
     httpd = server_class(
         server_address,
         lambda *args, **kwargs: handler_class(
-            model_provider, prompt_cache, system_fingerprint, *args, **kwargs
+            model_provider,
+            prompt_cache=prompt_cache,
+            system_fingerprint=get_system_fingerprint(),
+            *args,
+            **kwargs,
         ),
     )
     warnings.warn(

llms/tests/test_server.py

@@ -14,6 +14,7 @@ class DummyModelProvider:
     def __init__(self):
         HF_MODEL_PATH = "mlx-community/Qwen1.5-0.5B-Chat-4bit"
         self.model, self.tokenizer = load(HF_MODEL_PATH)
+        self.model_key = (HF_MODEL_PATH, None)
 
     def load(self, model, adapter=None):
         assert model in ["default_model", "chat_model"]