def METHOD_NAME(driver) -> None:
    assert driver.field_target().distance(FieldVector(0, 0, 0)) <= 1e-8
    driver.field_target(FieldVector(r=0.1, theta=0, phi=0))
    assert driver.field_target().distance(
        FieldVector(r=0.1, theta=0, phi=0)
    ) <= 1e-8