CODEWITHSUNDEEP
react-nativemocha.jsdetox
Tom Aranda
Tom Aranda

Reputation: 6036

How can I retry failed end to end tests in Detox using Mocha?

I have a flaky end-to-end test that uses Detox and Mocha.

The Mocha test runner allows for multiple retries. I tried using the recommended Mocha syntax:

// auth.spec.js
describe('App authentication', () => {

  this.retries(2);

  it('should have a login screen', async () => {
    await expect(element(by.id('LoginScreenView'))).toBeVisible();
  });

});

However, it appears this is an empty object ({}) and does not have a retries function when running Detox with Mocha as the test runner.

It generates the following error: 

node_modules/.bin/mocha __e2e__ --opts __e2e__/config/mocha.opts --

configuration ios.sim.debug      --grep :android: --invert     --artifacts-location "__e2e__/artifacts/ios.sim.debug.2018-10-17 22-51-12Z" 
/<path>/__e2e__/auth.spec.js:10
  this.retries(2);
       ^

TypeError: this.retries is not a function
    at Suite.describe (/<path>/__e2e__/auth.spec.js:4:8)
    at Object.create (/<path>/node_modules/mocha/lib/interfaces/common.js:112:19)
    at context.describe.context.context (/<path>/node_modules/mocha/lib/interfaces/bdd.js:40:27)
    at Object.<anonymous> (/<path>/__e2e__/auth.spec.js:3:1)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
    at /<path>/node_modules/mocha/lib/mocha.js:250:27
    at Array.forEach (<anonymous>)
    at Mocha.loadFiles (/<path>/node_modules/mocha/lib/mocha.js:247:14)
    at Mocha.run (/<path>/node_modules/mocha/lib/mocha.js:576:10)
    at Object.<anonymous> (/<path>/node_modules/mocha/bin/_mocha:637:18)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Function.Module.runMain (module.js:693:10)
    at startup (bootstrap_node.js:188:16)
    at bootstrap_node.js:609:3
child_process.js:644
    throw err;
    ^

Is there a way to automatically retry failed tests in Detox?

Upvotes: 0

Views: 720

Answers (1)

deerawan
deerawan

Reputation: 8443

this in mocha can't work with arrow function, so must change it into ordinary one

// auth.spec.js
describe('App authentication', function () { // change it

  this.retries(2);

It is not recommended best practice to use in Mocha

Ref: https://mochajs.org/#arrow-functions

Hope it helps

Upvotes: 1

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