Update tb.v - make tests now dump variables

test/tb.v

@@ -7,12 +7,12 @@
 module tb ();
 
   // Dump the signals to a VCD file. You can view it with gtkwave.
-  /*
+
   initial begin
     $dumpfile("tb.vcd");
     $dumpvars(0, tb);
     #1;
-  end*/
+  end
   // Wire up the inputs and outputs:
   reg clk;
   reg rst_n;