add tests for optional tool args

tests/tools/test_tool_types.py

@@ -107,6 +107,25 @@ async def execute(extracted: list[Word]):
     return execute
 
 
+@tool
+def sound_check():
+    async def execute(sound: str, extra: str = "stuff"):
+        """
+        Accepts the extracted nouns and adjectives from a sentence
+
+        Args:
+          sound: The sound to check
+          extra: Optional extra stuff
+
+
+        Returns:
+          The sound that was passed to check.
+        """
+        return f"{sound} ({extra})"
+
+    return execute
+
+
 def check_point(model: str, tool: Tool, function_name: str) -> None:
     task = Task(
         dataset=MemoryDataset(
@@ -173,11 +192,31 @@ def check_list_of_objects(model: str) -> None:
     verify_tool_call(log, "quick:")
 
 
+def check_optional_args(model: str) -> None:
+    task = Task(
+        dataset=MemoryDataset(
+            [
+                Sample(
+                    input="Please call the sound_check tool with single argument 'boo' and report its output."
+                )
+            ]
+        ),
+        solver=[
+            use_tools([sound_check()], tool_choice=ToolFunction("sound_check")),
+            generate(),
+        ],
+    )
+
+    log = eval(task, model=model)[0]
+    verify_tool_call(log, "stuff")
+
+
 def check_tool_types(model: str):
     check_typed_dict(model)
     check_dataclass(model)
     check_list_of_numbers(model)
     check_list_of_objects(model)
+    check_optional_args(model)
 
 
 @skip_if_no_openai