Simplify test case

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1348417 13f79535-47bb-0310-9956-ffa450edef68

src/test/java/org/apache/commons/lang3/builder/ToStringBuilderTest.java

@@ -79,15 +79,9 @@ public class ToStringBuilderTest {
         }
     }
 
-    @Test
+    @Test(expected=IllegalArgumentException.class)
     public void testSetDefaultEx() {
-        try {
-            ToStringBuilder.setDefaultStyle(null);
-
-        } catch (IllegalArgumentException ex) {
-            return;
-        }
-        fail();
+        ToStringBuilder.setDefaultStyle(null);
     }
 
     @Test