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"""Unit tests for tensor helpers."""
import tvm
from tvm import relay
import pytest


def test_device_copy_via_string():
    x = relay.var("x")
    call = relay.op.device_copy(x, "cuda", "cpu")
    assert isinstance(call, relay.Call)
    assert len(call.args) == 1
    assert call.args[0] == x
    assert call.attrs.src_virtual_device.device_type_int == 2  # ie kDLCUDA
    assert call.attrs.src_virtual_device.virtual_device_id == 0
    assert call.attrs.src_virtual_device.target is None
    assert call.attrs.src_virtual_device.memory_scope == ""
    assert call.attrs.dst_virtual_device.device_type_int == 1  # ie kDLCPU
    assert call.attrs.dst_virtual_device.virtual_device_id == 0
    assert call.attrs.dst_virtual_device.target is None
    assert call.attrs.dst_virtual_device.memory_scope == ""


def test_device_copy_via_device():
    x = relay.var("x")
    call = relay.op.device_copy(x, tvm.device("cuda"), tvm.device("cpu"))
    assert isinstance(call, relay.Call)
    assert len(call.args) == 1
    assert call.args[0] == x
    assert call.attrs.src_virtual_device.device_type_int == 2  # ie kDLCUDA
    assert call.attrs.dst_virtual_device.device_type_int == 1  # ie kDLCPU


if __name__ == "__main__":
    import sys

    sys.exit(pytest.main([__file__] + sys.argv[1:]))