Fix parallel tool call test for speculative decoding variants (#19370)

Co-authored-by: Alison Shao <alisonshao@Mac.attlocal.net>
Co-authored-by: Alison Shao <alisonshao@MacBook-Pro-D2W773R9CD.local>

python/sglang/test/tool_call_test_runner.py

@@ -77,15 +77,28 @@ ADD_TOOL_STRICT = {
     "function": {**ADD_TOOL["function"], "strict": True},
 }
 
+WEATHER_TOOL_STRICT = {
+    "type": "function",
+    "function": {**WEATHER_TOOL["function"], "strict": True},
+}
 
-def _call(client, model, content, tools=None, tool_choice="required", **kwargs):
+
+def _call(
+    client,
+    model,
+    content,
+    tools=None,
+    tool_choice="required",
+    temperature=0.1,
+    **kwargs,
+):
     """Single-turn tool call request. Defaults to ADD_TOOL_STRICT + required."""
     return client.chat.completions.create(
         model=model,
         messages=[{"role": "user", "content": content}],
         tools=tools or [ADD_TOOL_STRICT],
         tool_choice=tool_choice,
-        temperature=0.1,
+        temperature=temperature,
         **kwargs,
     )
 
@@ -265,8 +278,10 @@ def _test_parallel(client, model):
     response = _call(
         client,
         model,
-        "What is 3+5 and what is the weather in Tokyo?",
+        "Please call both functions: use add to compute 3+5, and use get_weather to check the weather in Tokyo.",
-        tools=[ADD_TOOL, WEATHER_TOOL],
+        tools=[ADD_TOOL_STRICT, WEATHER_TOOL_STRICT],
+        tool_choice="auto",
+        temperature=0,
     )
     tc = response.choices[0].message.tool_calls
     assert tc and len(tc) >= 2, f"expected >= 2 tool calls, got {len(tc) if tc else 0}"
@@ -329,11 +344,11 @@ def run_tool_call_test(
     """Launch server, run enabled test cases, return results."""
     base_url = base_url or DEFAULT_URL_FOR_TEST
 
-    print(f"\n{'='*60}")
+    print(f"\n{'=' * 60}")
     print(f"Running TOOL CALL test for {model.model_path}")
     if model.variant:
         print(f"  Variant: {model.variant}")
-    print(f"{'='*60}\n")
+    print(f"{'=' * 60}\n")
 
     process = None
     try: