server : replace behave with pytest (#10416)

* server : replace behave with pytest

* fix test on windows

* misc

* add more tests

* more tests

* styling

* log less, fix embd test

* added all sequential tests

* fix coding style

* fix save slot test

* add parallel completion test

* fix parallel test

* remove feature files

* update test docs

* no cache_prompt for some tests

* add test_cache_vs_nocache_prompt

examples/server/tests/unit/test_lora.py

@@ -0,0 +1,42 @@
+import pytest
+import os
+from utils import *
+
+server = ServerPreset.stories15m_moe()
+
+LORA_FILE_URL = "https://huggingface.co/ggml-org/stories15M_MOE/resolve/main/moe_shakespeare15M.gguf"
+
+@pytest.fixture(scope="module", autouse=True)
+def create_server():
+    global server
+    server = ServerPreset.stories15m_moe()
+    # download lora file if needed
+    file_name = LORA_FILE_URL.split('/').pop()
+    lora_file = f'../../../{file_name}'
+    if not os.path.exists(lora_file):
+        print(f"Downloading {LORA_FILE_URL} to {lora_file}")
+        with open(lora_file, 'wb') as f:
+            f.write(requests.get(LORA_FILE_URL).content)
+        print(f"Done downloading lora file")
+    server.lora_files = [lora_file]
+
+
+@pytest.mark.parametrize("scale,re_content", [
+    # without applying lora, the model should behave like a bedtime story generator
+    (0.0, "(little|girl|three|years|old)+"),
+    # with lora, the model should behave like a Shakespearean text generator
+    (1.0, "(eye|love|glass|sun)+"),
+])
+def test_lora(scale: float, re_content: str):
+    global server
+    server.start()
+    res_lora_control = server.make_request("POST", "/lora-adapters", data=[
+        {"id": 0, "scale": scale}
+    ])
+    assert res_lora_control.status_code == 200
+    res = server.make_request("POST", "/completion", data={
+        "prompt": "Look in thy glass",
+    })
+    assert res.status_code == 200
+    assert match_regex(re_content, res.body["content"])
+