Nonparametric test of independence between a pair of spatial objects (random fields, point processes) based on random shifts with torus or variance correction. See Mrkvička et al. (2021) <doi:10.1016/j.spasta.2020.100430>, Dvořák et al. (2022) <doi:10.1111/insr.12503>, Dvořák and Mrkvička (2024) <doi:10.1080/10618600.2024.2357626>.