one_hot_tb.v

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// Copyright 2007 Altera Corporation. All rights reserved.  
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module one_hot_tb ();

wire [63:0] out;
reg [5:0] in;

one_hot o (.in(in),.out(out));

initial begin 
  in=0;
end

reg [63:0] ref;
always @(*) begin
	ref = 0;
	ref[in] = 1'b1;
end

reg fail = 0;
always begin
  #1000 in = in + 1;
  #10 if (ref !== out) begin
	$display ("Mismatch at time %d",$time);
	fail = 1; 
  end
  if (in == 63) begin
	if (!fail) $display ("PASS");
	$stop();
  end
end

endmodule