[tests] Show site if skipping tests due to missing rights

Change-Id: I2541bdc05e98c2fe8fb563d9486e4797ebcdef79
---
M tests/aspects.py
1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/tests/aspects.py b/tests/aspects.py
index 4c3d1fb..4ae285e 100644
--- a/tests/aspects.py
+++ b/tests/aspects.py
@@ -675,9 +675,9 @@
 
             for right in cls.rights.split(','):
                 if not site.has_right(right):
-                    raise unittest.SkipTest('User "{}" does not have required '
-                                            'user right "{}"'
-                                            .format(site.user(), right))
+                    raise unittest.SkipTest(
+                        f'User "{site.user()}" does not have required user '
+                        f'right "{right}" on site "{site}"')
 
 
 class MetaTestCaseClass(type):

