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import pytest
from mcp.types import TextContent
from fastmcp import FastMCP
from fastmcp.contrib.bulk_tool_caller.bulk_tool_caller import (
BulkToolCaller,
CallToolRequest,
CallToolRequestResult,
)
from fastmcp.tools.tool import Tool
class ToolException(Exception):
"""Custom exception for tool errors."""
pass
async def error_tool(arg1: str) -> dict[str, Any]:
"""A tool that raises an error for testing purposes."""
raise ToolException(f"Error in tool with arg1: {arg1}")
def error_tool_result_factory(arg1: str) -> CallToolRequestResult:
"""Generates the expected error result for error_tool."""
# Mimic the error message format generated by BulkToolCaller when catching ToolException
formatted_error_text = (
"Error calling tool 'error_tool': Error in tool with arg1: " + arg1
)
return CallToolRequestResult(
isError=True,
content=[TextContent(text=formatted_error_text, type="text")],
tool="error_tool",
arguments={"arg1": arg1},
)
async def echo_tool(arg1: str) -> str:
"""A simple tool that echoes arguments or raises an error."""
return arg1
def echo_tool_result_factory(arg1: str) -> CallToolRequestResult:
"""A tool that returns a result based on the input arguments."""
return CallToolRequestResult(
isError=False,
content=[TextContent(text=f"{arg1}", type="text")],
tool="echo_tool",
arguments={"arg1": arg1},
)
async def no_return_tool(arg1: str) -> None:
"""A simple tool that echoes arguments or raises an error."""
def no_return_tool_result_factory(arg1: str) -> CallToolRequestResult:
"""A tool that returns a result based on the input arguments."""
return CallToolRequestResult(
isError=False,
content=[],
tool="no_return_tool",
arguments={"arg1": arg1},
)
@pytest.fixture(scope="module")
def live_server_with_tool() -> FastMCP:
"""Fixture to create a FastMCP server instance with the echo_tool registered."""
server = FastMCP()
server.add_tool(Tool.from_function(echo_tool))
server.add_tool(Tool.from_function(error_tool))
server.add_tool(Tool.from_function(no_return_tool))
return server
@pytest.fixture
def bulk_caller_live(live_server_with_tool: FastMCP) -> BulkToolCaller:
"""Fixture to create a BulkToolCaller instance connected to the live server."""
bulk_tool_caller = BulkToolCaller()
bulk_tool_caller.register_tools(live_server_with_tool)
return bulk_tool_caller
ECHO_TOOL_NAME = "echo_tool"
ERROR_TOOL_NAME = "error_tool"
NO_RETURN_TOOL_NAME = "no_return_tool"
async def test_call_tool_bulk_single_success(bulk_caller_live: BulkToolCaller):
"""Test single successful call via call_tool_bulk using echo_tool."""
tool_arguments = [{"arg1": "value1"}]
expected_result = echo_tool_result_factory(**tool_arguments[0])
results = await bulk_caller_live.call_tool_bulk(ECHO_TOOL_NAME, tool_arguments)
assert len(results) == 1
result = results[0]
assert result == expected_result
async def test_call_tool_bulk_multiple_success(bulk_caller_live: BulkToolCaller):
"""Test multiple successful calls via call_tool_bulk using echo_tool."""
tool_arguments = [{"arg1": "value1"}, {"arg1": "value2"}]
expected_results = [echo_tool_result_factory(**args) for args in tool_arguments]
results = await bulk_caller_live.call_tool_bulk(ECHO_TOOL_NAME, tool_arguments)
assert len(results) == 2
assert results == expected_results
async def test_call_tool_bulk_error_stops(bulk_caller_live: BulkToolCaller):
"""Test call_tool_bulk stops on first error using error_tool."""
tool_arguments = [{"arg1": "error_value"}, {"arg1": "value2"}]
expected_result = error_tool_result_factory(**tool_arguments[0])
results = await bulk_caller_live.call_tool_bulk(
ERROR_TOOL_NAME, tool_arguments, continue_on_error=False
)
assert len(results) == 1
result = results[0]
assert result == expected_result
async def test_call_tool_bulk_error_continues(bulk_caller_live: BulkToolCaller):
"""Test call_tool_bulk continues on error using error_tool and echo_tool."""
tool_arguments = [{"arg1": "error_value"}, {"arg1": "success_value"}]
expected_error_result = error_tool_result_factory(**tool_arguments[0])
expected_success_result = echo_tool_result_factory(**tool_arguments[1])
tool_calls = [
CallToolRequest(tool=ERROR_TOOL_NAME, arguments=tool_arguments[0]),
CallToolRequest(tool=ECHO_TOOL_NAME, arguments=tool_arguments[1]),
]
results = await bulk_caller_live.call_tools_bulk(tool_calls, continue_on_error=True)
assert len(results) == 2
error_result = results[0]
assert error_result == expected_error_result
success_result = results[1]
assert success_result == expected_success_result
async def test_call_tools_bulk_single_success(bulk_caller_live: BulkToolCaller):
"""Test single successful call via call_tools_bulk using echo_tool."""
tool_calls = [CallToolRequest(tool=ECHO_TOOL_NAME, arguments={"arg1": "value1"})]
expected_result = echo_tool_result_factory(**tool_calls[0].arguments)
results = await bulk_caller_live.call_tools_bulk(tool_calls)
assert len(results) == 1
result = results[0]
assert result == expected_result
async def test_call_tools_bulk_multiple_success(bulk_caller_live: BulkToolCaller):
"""Test multiple successful calls via call_tools_bulk with different tools."""
tool_calls = [
CallToolRequest(tool=ECHO_TOOL_NAME, arguments={"arg1": "echo_value"}),
CallToolRequest(
tool=NO_RETURN_TOOL_NAME, arguments={"arg1": "no_return_value"}
),
]
expected_results = [
echo_tool_result_factory(**tool_calls[0].arguments),
no_return_tool_result_factory(**tool_calls[1].arguments),
]
results = await bulk_caller_live.call_tools_bulk(tool_calls)
assert len(results) == 2
assert results == expected_results
async def test_call_tools_bulk_error_stops(bulk_caller_live: BulkToolCaller):
"""Test call_tools_bulk stops on first error using error_tool."""
tool_calls = [
CallToolRequest(tool=ERROR_TOOL_NAME, arguments={"arg1": "error_value"}),
CallToolRequest(tool=ECHO_TOOL_NAME, arguments={"arg1": "skipped_value"}),
]
expected_result = error_tool_result_factory(**tool_calls[0].arguments)
results = await bulk_caller_live.call_tools_bulk(
tool_calls, continue_on_error=False
)
assert len(results) == 1
result = results[0]
assert result == expected_result
async def test_call_tools_bulk_error_continues(bulk_caller_live: BulkToolCaller):
"""Test call_tools_bulk continues on error using error_tool and echo_tool."""
tool_calls = [
CallToolRequest(tool=ERROR_TOOL_NAME, arguments={"arg1": "error_value"}),
CallToolRequest(tool=ECHO_TOOL_NAME, arguments={"arg1": "success_value"}),
]
expected_error_result = error_tool_result_factory(**tool_calls[0].arguments)
expected_success_result = echo_tool_result_factory(**tool_calls[1].arguments)
results = await bulk_caller_live.call_tools_bulk(tool_calls, continue_on_error=True)
assert len(results) == 2
error_result = results[0]
assert error_result == expected_error_result
success_result = results[1]
assert success_result == expected_success_result
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