Fix sporadic failure in ThreadRenamingRunnableTest

- Make sure the ThreadNameDeterminer is reset to the default after each test to avoid the side effect between tests

src/test/java/org/jboss/netty/util/ThreadRenamingRunnableTest.java

@@ -15,6 +15,7 @@
  */
 package org.jboss.netty.util;
 
+import org.junit.After;
 import org.junit.AfterClass;
 import org.junit.Test;
 
@@ -26,6 +27,16 @@ import static org.junit.Assert.*;
 
 public class ThreadRenamingRunnableTest {
 
+    @After
+    public void setUp() {
+        ThreadRenamingRunnable.setThreadNameDeterminer(ThreadNameDeterminer.PROPOSED);
+    }
+
+    @Test
+    public void defaultIsProposed() {
+        assertSame(ThreadNameDeterminer.PROPOSED, ThreadRenamingRunnable.getThreadNameDeterminer());
+    }
+
     @Test(expected = NullPointerException.class)
     public void shouldNotAllowNullName() throws Exception {
         new ThreadRenamingRunnable(createMock(Runnable.class), null);