tests/test_nanshe/test_box/test_spams_sandbox.py: Fix up some 3D tests.
tests/test_nanshe/test_box/test_spams_sandbox.py: Fix up some 3D tests.

DudLab/nanshe,nanshe-org/nanshe,jakirkham/nanshe,nanshe-org/nanshe,jakirkham/nanshe,DudLab/nanshe