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@mozilla/jest-dev-server
Advanced tools
Starts a server before your Jest tests and tears it down after.
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
,teardown
and getServers
functions.
// global-setup.js
const { setup: setupDevServer } = require('jest-dev-server')
module.exports = async function globalSetup() {
await setupDevServer({
command: `node config/start.js --port=3000`,
launchTimeout: 50000,
port: 3000,
})
// Your global setup
}
It is also possible to specify several servers:
// global-setup.js
const { setup: setupDevServer } = require('jest-dev-server')
module.exports = async function globalSetup() {
await setupDevServer([
{
command: 'node server.js',
port: 4444,
},
{
command: 'node server2.js',
port: 4445,
},
])
// Your global setup
}
// global-setup.js
const { setup: setupDevServer, getServers } = require('jest-dev-server')
module.exports = async function globalSetup() {
await setupDevServer({
command: `node config/start.js --port=3000`,
launchTimeout: 50000,
port: 3000,
})
getServers.then(servers => {
// You can get to the servers and do whatever you want
})
// Your global setup
}
// global-teardown.js
const { teardown: teardownDevServer } = require('jest-dev-server')
module.exports = async function globalTeardown() {
await teardownDevServer()
// Your global teardown
}
command
Type: string
, required.
Command to execute to start the port.
Directly passed to spawnd
.
module.exports = {
command: 'npm run start',
}
debug
Type: boolean
, default to false
.
Log server output, useful if server is crashing at start.
module.exports = {
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.
module.exports = {
command: 'npm run start',
launchTimeout: 30000,
}
Following options are linked to spawnd
.
host
Type: string
, default to localhost
.
Host to wait for activity on before considering the server running.
Must be used in conjunction with port
.
module.exports = {
command: 'npm run start --port 3000',
host: 'customhost.com',
port: 3000,
}
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
.
module.exports = {
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.
module.exports = {
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 promptmodule.exports = {
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
module.exports = {
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'
.MIT
FAQs
Starts a server before your Jest tests and tears it down after.
The npm package @mozilla/jest-dev-server receives a total of 0 weekly downloads. As such, @mozilla/jest-dev-server popularity was classified as not popular.
We found that @mozilla/jest-dev-server demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 6 open source maintainers collaborating on the project.
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