[FIX] import in __init__.py
[FIX] test/account_invoice_line.yml: used sale.advance.payment.inv instead of sale.make.invoice to create invoice in test/account_invoice_line.yml
[IMP] Renamed test yml
[IMP] message in yml test
[ADD] assert in yml test
Merge pull request #1 from tafaRU/imp_account_invoice_uos_7

[IMP] account_invoice_uos tests