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"""Define module level fixtures."""
from typing import TYPE_CHECKING
import pytest
from cobra.sampling import ACHRSampler
if TYPE_CHECKING:
from cobra import Model
@pytest.fixture(scope="function")
def achr(model: "Model") -> ACHRSampler:
"""Return ACHRSampler instance for tests."""
sampler = ACHRSampler(model, thinning=1)
assert (sampler.n_warmup > 0) and (sampler.n_warmup <= 2 * len(model.variables))
assert all(sampler.validate(sampler.warmup) == "v")
return sampler
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