Revert "Delete customer tests"
Revert "Delete customer tests"

This reverts commit 915d88e06994391efb51c9a7fd2cb75759c4aae3.

khchine5/django-shop,rfleschenberg/django-shop,divio/django-shop,rfleschenberg/django-shop,khchine5/django-shop,khchine5/django-shop,awesto/django-shop,nimbis/django-shop,nimbis/django-shop,khchine5/django-shop,rfleschenberg/django-shop,jrief/django-shop,nimbis/django-shop,awesto/django-shop,awesto/django-shop,divio/django-shop,nimbis/django-shop,jrief/django-shop,jrief/django-shop,divio/django-shop,rfleschenberg/django-shop,jrief/django-shop