plot_complex_vector(expr, (z, -5 - 5j, 5 + 5j),
    scalar=False, use_cm=False, normalize=True)
# Expected:
## Plot object containing:
## [0]: 2D vector series: [(re(_x) - im(_y))**2 - (re(_y) + im(_x))**2 + 2, 2*(re(_x) - im(_y))*(re(_y) + im(_x))] over (_x, -5.0, 5.0), (_y, -5.0, 5.0)