Fixed the TestPurchaseInvoice.test_double_validation and the setupClass to use test accounting data in setupClass instead of the demo data. closes odoo/odoo#89370 X-original-commit: a7546aead36c5d56809fcd9c46b2a552991b5449 Signed-off-by: Steve Van Essche <svs@odoo.com> Signed-off-by: Paolo Gatti (pgi) <pgi@odoo.com>