iverilog/ivtest/vvp_tests/dumpfile.json

{
    "type" : "normal",
    "source" : "dumpfile.v",
    "gold"   : "dumpfile",
    "vvp-args-extended" : [ "-vcd", "-dumpfile=foo" ],
    "vlog95" : {
        "gold"   : "dumpfile-vlog95"
    }
}