Checkstyle fixes for tests

- Fixed some checkstyle errors which seemed easier to fix.

Change-Id: I9dadd2e8f98b560fadcc2b704ac52ff8f8b93913
diff --git a/src/test/java/net/onrc/onos/core/util/ImmutableClassCheckerTest.java b/src/test/java/net/onrc/onos/core/util/ImmutableClassCheckerTest.java
index 151c802..7471a07 100644
--- a/src/test/java/net/onrc/onos/core/util/ImmutableClassCheckerTest.java
+++ b/src/test/java/net/onrc/onos/core/util/ImmutableClassCheckerTest.java
@@ -12,12 +12,14 @@
  * checker.
  */
 public class ImmutableClassCheckerTest {
+    // CHECKSTYLE:OFF test data intentionally not final
     /**
      * Test class for non final class check.
      */
     static class NonFinal {
-        private NonFinal() {}
+        private NonFinal() { }
     }
+    // CHECKSTYLE:ON
 
     /**
      * Check that a non final class correctly produces an error.