tests/python/all-platform-minimal-test/test_validate_runtime_library.py

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"""Post-install checks for a built TVM wheel.

These live in ``tests/python/all-platform-minimal-test`` so the standard suite and
the cibuildwheel ``test-command`` run a single pytest invocation. The assertions
here are wheel-specific things the rest of the suite cannot check -- that LLVM is
enabled (the other LLVM test merely *skips* when LLVM is absent) and that the CUDA
runtime library got bundled -- so each is gated behind a ``TVM_WHEEL_EXPECT_*`` env
var and SKIPS unless that var is set. cibuildwheel sets the vars (see
``CIBW_TEST_ENVIRONMENT`` in ``.github/actions/build-wheel-for-publish``); ordinary
source-build CI (e.g. ``main.yml``) leaves them unset, so these tests skip there and
never fail a non-wheel / non-LLVM / non-CUDA build.
"""

import glob
import os
from pathlib import Path

import pytest

import tvm


def test_llvm_enabled():
    """Every published TVM wheel ships with LLVM enabled. Only assert this when
    validating a wheel (``TVM_WHEEL_EXPECT_LLVM=1``); skip otherwise so source
    builds with LLVM off do not fail."""
    if os.environ.get("TVM_WHEEL_EXPECT_LLVM") != "1":
        pytest.skip("LLVM enablement only asserted during wheel validation")
    assert tvm.runtime.enabled("llvm"), "wheel was not built with LLVM enabled"


def test_cuda_runtime_present():
    """The bundled CUDA runtime library must be present in tvm/lib."""
    if os.environ.get("TVM_WHEEL_EXPECT_CUDA_RUNTIME") != "1":
        pytest.skip("CUDA runtime not expected in this wheel")
    libdir = Path(tvm.__file__).resolve().parent / "lib"
    present = glob.glob(str(libdir / "libtvm_runtime_cuda.*")) or glob.glob(
        str(libdir / "tvm_runtime_cuda.*")
    )
    assert present, "CUDA runtime expected but not bundled in tvm/lib"