[IMP] sale: make test at install

Since test cases of sale depends on account common
class test, they are executed post_install.
For some futur dev, we will need to launch them
at install (since stock module change the behavior
of consumable product for delivered quantity computation).

This commit:
- avoid test to use demo data
- reuse common helpers to generate testing
data
- make test suite share common test classes

0 files changed, 0 insertions, 0 deletions