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fix flaky test test_88_random_error by ihrpr · Pull Request #1171 · modelcontextprotocol/python-sdk · GitHub

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fix flaky test test_88_random_error #1171

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Merged
ihrpr merged 2 commits into from
Jul 18, 2025
Conversation 3 Commits 2 Checks 13 Files changed
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fix flaky test test_88_random_error #1171

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82c961d
fix flaky test
ihrpr Jul 18, 2025
eeca507
typos
ihrpr Jul 18, 2025
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19 changes: 5 additions & 14 deletions tests/issues/test_88_random_error.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,8 +28,7 @@ async def test_notification_validation_error(tmp_path: Path):

server = Server(name="test")
request_count = 0
slow_request_started = anyio.Event()
slow_request_complete = anyio.Event()
slow_request_lock = anyio.Event()

@server.list_tools()
async def list_tools() -> list[types.Tool]:
Expand All @@ -52,16 +51,9 @@ async def slow_tool(name: str, arg) -> Sequence[ContentBlock]:
request_count += 1

if name == "slow":
# Signal that slow request has started
slow_request_started.set()
# Long enough to ensure timeout
await anyio.sleep(0.2)
# Signal completion
slow_request_complete.set()
await slow_request_lock.wait() # it should timeout here
return [TextContent(type="text", text=f"slow {request_count}")]
elif name == "fast":
# Fast enough to complete before timeout
await anyio.sleep(0.01)
return [TextContent(type="text", text=f"fast {request_count}")]
return [TextContent(type="text", text=f"unknown {request_count}")]

Expand Down Expand Up @@ -90,16 +82,15 @@ async def client(read_stream, write_stream, scope):
# First call should work (fast operation)
result = await session.call_tool("fast")
assert result.content == [TextContent(type="text", text="fast 1")]
assert not slow_request_complete.is_set()
assert not slow_request_lock.is_set()

# Second call should timeout (slow operation)
with pytest.raises(McpError) as exc_info:
await session.call_tool("slow")
assert "Timed out while waiting" in str(exc_info.value)

# Wait for slow request to complete in the background
with anyio.fail_after(1): # Timeout after 1 second
await slow_request_complete.wait()
# release the slow request not to have hanging process
slow_request_lock.set()

# Third call should work (fast operation),
# proving server is still responsive
Expand Down
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