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50b9deacb0
Comment and docstring changes only, in test files, split out of #12968 so the test-only part can merge first.
67 lines
2.7 KiB
Python
67 lines
2.7 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-only
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# Copyright 2026-present the Unsloth AI Inc. team. All rights reserved.
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"""bitsandbytes must be imported before the conftest cuda spoof; a failed import cannot be recovered."""
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from __future__ import annotations
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import ast
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from pathlib import Path
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CONFTEST = Path(__file__).resolve().parents[1] / "conftest.py"
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def _accelerator_guard_body(tree: ast.Module) -> list[ast.stmt]:
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for node in tree.body:
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if isinstance(node, ast.If) and "_has_real_accelerator" in ast.dump(node.test):
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return node.body
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raise AssertionError("tests/conftest.py has no `if not _has_real_accelerator():` block")
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def _called_names(body: list[ast.stmt]) -> list[str]:
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names = []
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for stmt in body:
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for node in ast.walk(stmt):
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if isinstance(node, ast.Call) and isinstance(node.func, ast.Name):
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names.append(node.func.id)
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return names
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def test_conftest_defines_the_bitsandbytes_preimport():
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tree = ast.parse(CONFTEST.read_text(encoding = "utf-8"))
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defined = {n.name for n in tree.body if isinstance(n, ast.FunctionDef)}
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assert "_preimport_bitsandbytes" in defined, (
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"tests/conftest.py must define _preimport_bitsandbytes(); without it a "
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"bitsandbytes import inside the CUDA spoof window permanently breaks "
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"`import unsloth` for the rest of the process"
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)
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def test_bitsandbytes_is_preimported_before_the_cuda_spoof():
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tree = ast.parse(CONFTEST.read_text(encoding = "utf-8"))
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called = _called_names(_accelerator_guard_body(tree))
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assert "_preimport_bitsandbytes" in called, (
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"_preimport_bitsandbytes() is never called inside the "
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"`if not _has_real_accelerator():` block"
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)
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assert "_preload_device_type" in called, "conftest no longer calls _preload_device_type"
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assert called.index("_preimport_bitsandbytes") < called.index("_preload_device_type"), (
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"_preimport_bitsandbytes() must run BEFORE _preload_device_type(), which is what "
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"patches torch.cuda.is_available; importing bitsandbytes inside that window makes "
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"it take its CUDA backend on a CPU-only torch and poisons sys.modules"
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)
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def test_preimport_swallows_a_genuinely_missing_wheel():
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"""An absent bitsandbytes stays unsloth's own degradation path, not a collection error."""
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tree = ast.parse(CONFTEST.read_text(encoding = "utf-8"))
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fn = next(
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n
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for n in tree.body
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if isinstance(n, ast.FunctionDef) and n.name == "_preimport_bitsandbytes"
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)
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assert any(isinstance(node, ast.Try) for node in ast.walk(fn)), (
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"_preimport_bitsandbytes() must guard its import with try/except so a missing or "
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"broken wheel does not turn into a collection error"
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)
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