JoinCommand and ArenaListCommand somewhat done.

test/mock/bukkit/MockCommand.java

@@ -0,0 +1,19 @@
+package mock.bukkit;
+
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+
+public class MockCommand extends Command
+{
+    public MockCommand(String name)
+    {
+        super(name);
+    }
+
+    @Override
+    public boolean execute(CommandSender arg0, String arg1, String[] arg2)
+    {
+        return false;
+    }
+
+}