[tests] Ignore disabled_tests from coverage

Change-Id: I059dd0eec1a0906ca310ed0b9c19be50eafd67c0
---
M tests/__init__.py
1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/tests/__init__.py b/tests/__init__.py
index 1de6877..8f10bc7 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -217,10 +217,9 @@
             'Extra test modules (run after library, before scripts):\n  {}'
             .format(', '.join(extra_test_modules)))
 
-    if disabled_tests:
-        unittest_print(
-            'Skipping tests (to run: python -m unittest ...):\n  {!r}'
-            .format(disabled_tests))
+    if disabled_tests:  # pragma: no cover
+        unittest_print(f'Skipping tests (to run: python -m unittest ...):\n'
+                       f'  {disabled_tests!r}')
 
     modules = (module
                for module in chain(library_test_modules,

