CODEWITHSUNDEEP
javascriptmocha.js
Mahendra S
Mahendra S

Reputation: 4699

How to increase timeout for a single test case in mocha

I'm submitting a network request in a test case, but this sometimes takes longer than 2 seconds (the default timeout).

How do I increase the timeout for a single test case?

Upvotes: 467

Views: 196083

Answers (8)

alditis
alditis

Reputation: 4817

For test navigation on Express:

const request = require('supertest');
const server = require('../bin/www');

describe('navigation', () => {
    it('login page', function(done) {
        this.timeout(4000);
        const timeOut = setTimeout(done, 3500);

        request(server)
            .get('/login')
            .expect(200)
            .then(res => {
                res.text.should.include('Login');
                clearTimeout(timeOut);
                done();
            })
            .catch(err => {
                console.log(this.test.fullTitle(), err);
                clearTimeout(timeOut);
                done(err);
            });
    });
});

In the example the test time is 4000 (4s).

Note: setTimeout(done, 3500) is minor for than done is called within the time of the test but clearTimeout(timeOut) it avoid than used all these time.

Upvotes: 15

Otpidus
Otpidus

Reputation: 519

This worked for me! Couldn't find anything to make it work with before()

describe("When in a long running test", () => {
  it("Should not time out with 2000ms", async () => {
    let service = new SomeService();
    let result = await service.callToLongRunningProcess();
    expect(result).to.be.true;
  }).timeout(10000); // Custom Timeout 
});

Upvotes: 14

user2513697
user2513697

Reputation:

If you are using in NodeJS then you can set timeout in package.json

"test": "mocha --timeout 10000"

then you can run using npm like:

npm test

Upvotes: 59

Dan Kohn
Dan Kohn

Reputation: 34337

Here you go: http://mochajs.org/#test-level

it('accesses the network', function(done){
  this.timeout(500);
  [Put network code here, with done() in the callback]
})

For arrow function use as follows:

it('accesses the network', (done) => {
  [Put network code here, with done() in the callback]
}).timeout(500);

Upvotes: 745

chriskelly
chriskelly

Reputation: 7736

(since I ran into this today)

Be careful when using ES2015 fat arrow syntax:

This will fail :

it('accesses the network', done => {

  this.timeout(500); // will not work

  // *this* binding refers to parent function scope in fat arrow functions!
  // i.e. the *this* object of the describe function

  done();
});

EDIT: Why it fails:

As @atoth mentions in the comments, fat arrow functions do not have their own this binding. Therefore, it's not possible for the it function to bind to this of the callback and provide a timeout function.

Bottom line: Don't use arrow functions for functions that need an increased timeout.

Upvotes: 77

Chris Sparrow
Chris Sparrow

Reputation: 1599

If you wish to use es6 arrow functions you can add a .timeout(ms) to the end of your it definition:

it('should not timeout', (done) => {
    doLongThing().then(() => {
        done();
    });
}).timeout(5000);

At least this works in Typescript.

Upvotes: 159

andrey
andrey

Reputation: 1977

From command line:

mocha -t 100000 test.js

Upvotes: 25

David Souther
David Souther

Reputation: 8184

You might also think about taking a different approach, and replacing the call to the network resource with a stub or mock object. Using Sinon, you can decouple the app from the network service, focusing your development efforts.

Upvotes: 17

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