format update

Change-Id: I06653ed2d87f3778e719bddbffa5c673dd7f4e8d
diff --git a/tests/unit-tests/challenge-credential.t.cpp b/tests/unit-tests/challenge-credential.t.cpp
index 46c5928..aeb7b7e 100644
--- a/tests/unit-tests/challenge-credential.t.cpp
+++ b/tests/unit-tests/challenge-credential.t.cpp
@@ -79,6 +79,6 @@
 
 BOOST_AUTO_TEST_SUITE_END()
 
-}  // namespace tests
-}  // namespace ndncert
-}  // namespace ndn
+} // namespace tests
+} // namespace ndncert
+} // namespace ndn