tests/python/runtime/test_runtime_device_api.py

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import os
import subprocess
import sys

import tvm
import tvm.testing


def test_check_if_device_exists():
    """kExist can be checked when no devices are present

    This test uses `CUDA_VISIBLE_DEVICES` to disable any CUDA-capable
    GPUs from being accessed by the subprocess.  Within the
    subprocess, the CUDA driver cannot be initialized.  While most
    functionality of CUDADeviceAPI would raise an exception, the
    `kExist` property can still be checked.

    """

    cmd = [
        sys.executable,
        "-c",
        "import tvm; tvm.device('cuda').exist",
    ]
    subprocess.check_call(
        cmd,
        env={
            **os.environ,
            "CUDA_VISIBLE_DEVICES": "",
        },
    )


if __name__ == "__main__":
    tvm.testing.main()