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test: guard blackjax NUTS tests on blackjax (Python matrix follow-up) #1359

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Merged
Jammy2211 merged 1 commit into from
Jul 11, 2026
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test: guard blackjax NUTS tests on blackjax (Python matrix follow-up) #1359

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16 changes: 8 additions & 8 deletions test_autofit/non_linear/search/mcmc/test_blackjax_nuts.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,12 +8,12 @@
_times_from_positions,
)

# `_times_from_positions` is jax-backed; it needs jax installed to run (jax
# ships via the `[optional]` extras). The NumPy-only Python-version matrix has
# no jax, so skip there rather than fail.
requires_jax = pytest.mark.skipif(
importlib.util.find_spec("jax") is None,
reason="requires jax (installed via the [optional] extras; absent on the NumPy-only matrix env)",
# `_times_from_positions` runs blackjax (which pulls jax); both ship via the
# `[optional]` extras. The Python-version matrix installs autofit without those
# extras, so skip there rather than fail with `No module named 'blackjax'`.
requires_blackjax = pytest.mark.skipif(
importlib.util.find_spec("blackjax") is None,
reason="requires blackjax (installed via the [optional] extras; absent on the matrix env)",
)

pytestmark = pytest.mark.filterwarnings("ignore::FutureWarning")
Expand Down Expand Up @@ -101,7 +101,7 @@ def test__identifier_fields_distinguish_run_shape():
assert (c.num_warmup, c.num_samples, c.num_chains) == (100, 999, 1)


@requires_jax
@requires_blackjax
def test__times_from_positions_clamps_low_ess():
# Construct a degenerate "chain" — every sample is identical → ESS
# collapses; the clamp must keep ``times`` finite and equal to N.
Expand All @@ -118,7 +118,7 @@ def test__times_from_positions_clamps_low_ess():
assert np.all(times <= n_samples + 1e-9)


@requires_jax
@requires_blackjax
def test__times_from_positions_independent_chain():
# Independent draws → ESS ≈ N, so τ ≈ 1.
rng = np.random.default_rng(1)
Expand Down
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