def test_validate_adjoint_invalid_device(self):
"""Test if a ValueError is raised when an invalid device is provided to
_validate_adjoint_method"""
dev = qml.device("default.gaussian", wires=1)
with pytest.raises(ValueError, match="The default.gaussian device does not"):
QNode._validate_adjoint_method(dev, "tf")
def test_validate_adjoint_finite_shots(self):
"""Test that a UserWarning is raised when device has finite shots"""
dev = qml.device("default.qubit", wires=1, shots=1)
with pytest.warns(
UserWarning, match="Requested adjoint differentiation to be computed with finite shots."
):
QNode._validate_adjoint_method(dev, "autograd")
