init covergroup

calc_tb.sv

@@ -12,6 +12,10 @@ parameter OP_IDLE = 0, OP_ADD = 1, OP_SUB = 2, OP_MUL = 3, OP_DIV = 4;
 
 CALC_logic calc_dut (clk, rst, calc, A, B, OP, STATE_C, C, valid);
 
+covergroup cg @(posedge clk);
+  c1: coverpoint STATE_C;
+endgroup: cg
+
 initial begin
     clk = 0;
 end