acls (linux): make tests as they should be

TODO: can this be done without creating a user/group "übel" with uid 666 gid 666?

borg/testsuite/platform.py

@@ -79,24 +79,27 @@ class PlatformLinuxTestCase(BaseTestCase):
         file = tempfile.NamedTemporaryFile()
         self.assert_equal(self.get_acl(file.name), {})
         nothing_special = 'user::rw-\ngroup::r--\nmask::rw-\nother::---\n'.encode('ascii')
+        # TODO: can this be tested without having an existing system user übel with uid 666 gid 666?
         user_entry = 'user:übel:rw-:666'.encode('utf-8')
         user_entry_numeric = 'user:666:rw-:666'.encode('ascii')
         group_entry = 'group:übel:rw-:666'.encode('utf-8')
         group_entry_numeric = 'group:666:rw-:666'.encode('ascii')
         acl = b'\n'.join([nothing_special, user_entry, group_entry])
         self.set_acl(file.name, access=acl, numeric_owner=False)
-        acl_access = self.get_acl(file.name)[b'acl_access']
-        # set_acl did not find the local user/group here, so it fell back to the uid/gid:
-        self.assert_in(user_entry_numeric, acl_access)
-        self.assert_in(group_entry_numeric, acl_access)
+        acl_access = self.get_acl(file.name, numeric_owner=False)[b'acl_access']
+        self.assert_in(user_entry, acl_access)
+        self.assert_in(group_entry, acl_access)
         acl_access_numeric = self.get_acl(file.name, numeric_owner=True)[b'acl_access']
         self.assert_in(user_entry_numeric, acl_access_numeric)
         self.assert_in(group_entry_numeric, acl_access_numeric)
         file2 = tempfile.NamedTemporaryFile()
         self.set_acl(file2.name, access=acl, numeric_owner=True)
-        acl_access = self.get_acl(file2.name)[b'acl_access']
-        self.assert_in(user_entry_numeric, acl_access)
-        self.assert_in(group_entry_numeric, acl_access)
+        acl_access = self.get_acl(file2.name, numeric_owner=False)[b'acl_access']
+        self.assert_in(user_entry, acl_access)
+        self.assert_in(group_entry, acl_access)
+        acl_access_numeric = self.get_acl(file.name, numeric_owner=True)[b'acl_access']
+        self.assert_in(user_entry_numeric, acl_access_numeric)
+        self.assert_in(group_entry_numeric, acl_access_numeric)
 
     def test_utils(self):
         from ..platform_linux import acl_use_local_uid_gid