Function test

test/parallel/test-http-response-statuscode.js:10–18

(res, header, code)

let reqNum = 0;

function test(res, header, code) {
  assert.throws(() => {
    res.writeHead(header);
  }, {
    code: 'ERR_HTTP_INVALID_STATUS_CODE',
    name: 'RangeError',
    message: `Invalid status code: ${code}`
  });
}

const server = http.Server(common.mustCall(function(req, res) {
  switch (reqNum) {