x.js

var test = require("tape")
var testling = require("testling")
var server

test("setup", function (assert) {
    testling.spawn("test/setup.js", function (err, proc) {
        assert.ifError(err)
        server = proc
        assert.end()
    })
})

test("real code", ...)

test("teardown", function (assert) {
    server.close(function (err) {
        assert.ifError(err)
        
        assert.end()
    })
})