server: inject date_string in llama 3.x template + fix date for firefunction v2 (#12802)

* Inject date_string in llama 3.x + fix for functionary v2

https://github.com/ggml-org/llama.cpp/issues/12729

* move/fix detection of functionary v3.1 before llama 3.x, fix & test their non-tool mode

Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>

* generate more tokens in test_completion_with_required_tool_tiny_fast to avoid truncation

---------

Co-authored-by: ochafik <ochafik@google.com>
Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>

tools/server/tests/unit/test_template.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+import pytest
+
+# ensure grandparent path is in sys.path
+from pathlib import Path
+import sys
+
+from unit.test_tool_call import TEST_TOOL
+path = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(path))
+
+import datetime
+from utils import *
+
+server: ServerProcess
+
+TIMEOUT_SERVER_START = 15*60
+
+@pytest.fixture(autouse=True)
+def create_server():
+    global server
+    server = ServerPreset.tinyllama2()
+    server.model_alias = "tinyllama-2"
+    server.server_port = 8081
+    server.n_slots = 1
+
+
+@pytest.mark.parametrize("tools", [None, [], [TEST_TOOL]])
+@pytest.mark.parametrize("template_name,format", [
+    ("meta-llama-Llama-3.3-70B-Instruct",    "%d %b %Y"),
+    ("fireworks-ai-llama-3-firefunction-v2", "%b %d %Y"),
+])
+def test_date_inside_prompt(template_name: str, format: str, tools: list[dict]):
+    global server
+    server.jinja = True
+    server.chat_template_file = f'../../../models/templates/{template_name}.jinja'
+    server.start(timeout_seconds=TIMEOUT_SERVER_START)
+
+    res = server.make_request("POST", "/apply-template", data={
+        "messages": [
+            {"role": "user", "content": "What is today?"},
+        ],
+        "tools": tools,
+    })
+    assert res.status_code == 200
+    prompt = res.body["prompt"]
+
+    today_str = datetime.date.today().strftime(format)
+    assert today_str in prompt, f"Expected today's date ({today_str}) in content ({prompt})"