verilator/test_regress/t/t_assert_basic.v

// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain.
// SPDX-FileCopyrightText: 2007 Wilson Snyder
// SPDX-License-Identifier: CC0-1.0

module t (
    input clk
);

  reg toggle;

  integer cyc;
  initial cyc = 1;
  wire [7:0] cyc_copy = cyc[7:0];

  always @(negedge clk) begin
    AssertionFalse1 : assert (cyc < 100);
    assert (!(cyc == 5) || toggle);
    // FIX cover  {cyc==3 || cyc==4};
    // FIX cover {cyc==9} report "DefaultClock,expect=1";
    // FIX cover  {(cyc==5)->toggle} report "ToggleLogIf,expect=1";
  end

  always @(posedge clk) begin
    if (cyc != 0) begin
      cyc <= cyc + 1;
      toggle <= !cyc[0];
      if (cyc == 7) assert (cyc[0] == cyc[1]);  // bug743
      if (cyc == 9) begin
`ifdef FAILING_ASSERTIONS
        assert (0)
        else $info;
        assert (0)
        else $info("Info message");
        assume (0)
        else $info("Info message from failing assumption");
        assert (0)
        else $info("Info message, cyc=%d", cyc);
        InWarningBlock :
        assert (0)
        else $warning;
        InWarningMBlock :
        assert (0)
        else $warning("Warning.... 1.0=%f 2.0=%f", 1.0, 2.0);
        InErrorBlock :
        assert (0)
        else $error;
        InErrorMBlock :
        assert (0)
        else $error("Error....");
        assert (0)
        else $fatal(1, "Fatal....");
        assert (0)
        else $fatal;
`endif
      end
      if (cyc == 10) begin
        $write("*-* All Finished *-*\n");
        $finish;
      end
    end
  end

endmodule