verilator/test_regress/t/t_force_tri.v

// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain.
// SPDX-FileCopyrightText: 2021 Wilson Snyder
// SPDX-License-Identifier: CC0-1.0

// verilog_format: off
`define stop $stop
`define checkh(gotv,expv) do if ((gotv) !== (expv)) begin $write("%%Error: %s:%0d:  got='h%x exp='h%x\n", `__FILE__,`__LINE__, (gotv), (expv)); `stop; end while(0)
// verilog_format: on

module t (
    input clk
);

  integer cyc = 0;

  logic [3:0] bus;

  // Test loop
  always @(posedge clk) begin
    cyc <= cyc + 1;
    if (cyc == 0) begin
      bus <= 4'b0101;
    end
    else if (cyc == 1) begin
      force bus = 4'bzz10;
    end
    else if (cyc == 2) begin
      `checkh(bus, 4'bzz10);
    end
    //
    else if (cyc == 99) begin
      $write("*-* All Finished *-*\n");
      $finish;
    end
  end

endmodule