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jest-dev-server
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Changelog
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Starts a server before your Jest tests and tears it down after.
jest-puppeteer
works great for running tests in Jest using Puppeteer.
It's also useful for starting a local development server during the tests without letting Jest hang.
This package extracts just the local development server spawning without any ties to Puppeteer.
npm install --save-dev jest-dev-server
jest-dev-server
exports setup
and teardown
functions.
// global-setup.js
const { setup: setupDevServer } = require("jest-dev-server");
module.exports = async function globalSetup() {
globalThis.servers = await setupDevServer({
command: `node config/start.js --port=3000`,
launchTimeout: 50000,
port: 3000,
});
// Your global setup
};
// global-teardown.js
const { teardown: teardownDevServer } = require("jest-dev-server");
module.exports = async function globalTeardown() {
await teardownDevServer(globalThis.servers);
// Your global teardown
};
You can specify several servers using an array of configs:
// global-setup.js
const { setup: setupDevServer } = require("jest-dev-server");
module.exports = async function globalSetup() {
globalThis.servers = await setupDevServer([
{
command: "node server.js",
port: 4444,
},
{
command: "node server2.js",
port: 4445,
},
]);
// Your global setup
};
command
Type: string
, required.
Command to execute to start the port.
Directly passed to spawnd
.
const options = {
command: "npm run start",
};
debug
Type: boolean
, default to false
.
Log server output, useful if server is crashing at start.
const options = {
command: "npm run start",
debug: true,
};
launchTimeout
Type: number
, default to 5000
.
How many milliseconds to wait for the spawned server to be available before giving up.
Defaults to wait-port
's default.
const options = {
command: "npm run start",
launchTimeout: 30000,
};
Following options are linked to spawnd
.
host
Type: string
, if not specified it will used Node.js default port.
Host to wait for activity on before considering the server running.
Must be used in conjunction with port
.
const options = {
command: "npm run start --port 3000",
host: "customhost.com",
port: 3000,
};
path
Type: string
, default to null
.
Path to resource to wait for activity on before considering the server running.
Must be used in conjunction with host
and port
.
const options = {
command: "npm run start --port 3000",
host: "customhost.com",
port: 3000,
path: "thing",
};
protocol
Type: string
, (https
, http
, tcp
, socket
) default to tcp
.
To wait for an HTTP or TCP endpoint before considering the server running, include http
or tcp
as a protocol.
Must be used in conjunction with port
.
const options = {
command: "npm run start --port 3000",
protocol: "http",
port: 3000,
};
port
Type: number
, default to null
.
Port to wait for activity on before considering the server running. If not provided, the server is assumed to immediately be running.
const options = {
command: "npm run start --port 3000",
port: 3000,
};
usedPortAction
Type: string
(ask
, error
, ignore
, kill
) default to ask
.
It defines the action to take if port is already used:
ask
: a prompt is shown to decide if you want to kill the process or noterror
: an errow is thrownignore
: your test are executed, we assume that the server is already startedkill
: the process is automatically killed without a promptconst options = {
command: "npm run start --port 3000",
port: 3000,
usedPortAction: "kill",
};
waitOnScheme
jest-dev-server
use the wait-on
npm package to wait for resources to become available before calling callback.
Type: object
, default to {}
.
delay
: optional initial delay in ms, default 0interval
: optional poll resource interval in ms, default 250mslog
: optional flag which outputs to stdout, remaining resources waited on and when complete or erroredreverse
: optional flag to reverse operation so checks are for resources being NOT available, default falsetimeout
: optional timeout in ms, default Infinity. Aborts with errortcpTimeout
: optional tcp timeout in ms, default 300msverbose
: optional flag which outputs debug output, default falsewindow
: optional stabilization time in ms, default 750ms. Waits this amount of time for file sizes to stabilize or other resource availability to remain unchangedNote: http(s) specific options, see https://github.com/request/request#readme for specific details
const options = {
command: "npm run start --port 3000",
port: 3000,
usedPortAction: "kill",
waitOnScheme: {
delay: 1000,
},
};
port
makes the terminal to ask for root password although the port is valid and accessible then use usePortAction: 'ignore'
.FAQs
Starts a server before your Jest tests and tears it down after.
The npm package jest-dev-server receives a total of 177,054 weekly downloads. As such, jest-dev-server popularity was classified as popular.
We found that jest-dev-server demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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