it should be abstract since by itself it defines no test

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@23555 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/test/java/hudson/ChannelTestCase.java

@@ -16,7 +16,7 @@ import hudson.remoting.Channel;
  *
  * @author Kohsuke Kawaguchi
  */
-public class ChannelTestCase extends TestCase {
+public abstract class ChannelTestCase extends TestCase {
     /**
      * Two channels that are connected to each other, but shares the same classloader.
      */