[IMP] mass_editing: Execute tests at the end for compatibility

This way, if you install the module with mail module for example,
you don't receive an error about a null value in some fields.

mass_editing/tests/test_mass_editing.py

@@ -9,6 +9,8 @@ from odoo.modules import registry
 from odoo.addons.mass_editing.hooks import uninstall_hook
 
 
+@common.at_install(False)
+@common.post_install(True)
 class TestMassEditing(common.TransactionCase):
 
     def setUp(self):