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# Copyright (c) 2026 ops-tilelang contributors
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import pytest

from cann_ops_tilelang.config import (
    get_amax_clamp_for_quant,
    reset_runtime_config,
    set_amax_clamp_for_quant,
)


@pytest.fixture(autouse=True)
def reset_quant_config():
    reset_runtime_config()
    yield
    reset_runtime_config()


@pytest.mark.parametrize('fmt', ['e4m3', 'e2m1'])
@pytest.mark.parametrize('value', [float('nan'), float('inf'), -float('inf'), 0.0, -1.0])
def test_quant_clamp_rejects_invalid_values_without_changing_config(fmt, value):
    previous = get_amax_clamp_for_quant(fmt)
    with pytest.raises(ValueError, match='positive'):
        set_amax_clamp_for_quant(fmt, value)
    assert get_amax_clamp_for_quant(fmt) == previous


@pytest.mark.parametrize('fmt', ['e4m3', 'e2m1'])
@pytest.mark.parametrize('value', [1e-8, 1.0, 1e6])
def test_quant_clamp_accepts_positive_finite_values(fmt, value):
    set_amax_clamp_for_quant(fmt, value)
    assert get_amax_clamp_for_quant(fmt) == value


def test_quant_clamp_rejects_unsupported_format():
    with pytest.raises(ValueError, match='Unsupported quantization format'):
        set_amax_clamp_for_quant('unknown', 1.0)