graphics(
    surface_abs_arg(sqrt(x), (x, -3-3j, 3+3j), n=101))
# Expected:
## Plot object containing:
## [0]: complex cartesian surface: abs(sqrt(x)) for re(x) over (-3.0, 3.0) and im(x) over (-3.0, 3.0)
## [1]: complex cartesian surface: arg(sqrt(x)) for re(x) over (-3.0, 3.0) and im(x) over (-3.0, 3.0)