Mocha TypeError when running test

What are you trying to achieve?

Run test with : npx codeceptjs run search_test.js

What do you get instead?

Provide console output if related. Use --verbose mode for more details.

TypeError: Cannot set property id of #<Test> which has only a getter
    at /home/gil/dev/heig/amt/OverFlow/e2e/node_modules/codeceptjs/lib/mochaFactory.js:53:46
    at Array.forEach (<anonymous>)
    at Suite.eachTest (/home/gil/dev/heig/amt/OverFlow/e2e/node_modules/mocha/lib/suite.js:438:14)
    at /home/gil/dev/heig/amt/OverFlow/e2e/node_modules/mocha/lib/suite.js:440:11
    at Array.forEach (<anonymous>)
    at Suite.eachTest (/home/gil/dev/heig/amt/OverFlow/e2e/node_modules/mocha/lib/suite.js:439:15)
    at Mocha.mocha.loadFiles (/home/gil/dev/heig/amt/OverFlow/e2e/node_modules/codeceptjs/lib/mochaFactory.js:53:21)
    at Mocha.run (/home/gil/dev/heig/amt/OverFlow/e2e/node_modules/mocha/lib/mocha.js:970:10)
    at /home/gil/dev/heig/amt/OverFlow/e2e/node_modules/codeceptjs/lib/codecept.js:170:15
    at new Promise (<anonymous>)

Cannot set property id of #<Test> which has only a getter

TypeError: 
    at /home/gil/dev/heig/amt/OverFlow/e2e/node_modules/codeceptjs/lib/mochaFactory.js:53:46
    at Array.forEach (<anonymous>)
    at Suite.eachTest (/home/gil/dev/heig/amt/OverFlow/e2e/node_modules/mocha/lib/suite.js:438:14)
    at /home/gil/dev/heig/amt/OverFlow/e2e/node_modules/mocha/lib/suite.js:440:11
    at Array.forEach (<anonymous>)
    at Suite.eachTest (/home/gil/dev/heig/amt/OverFlow/e2e/node_modules/mocha/lib/suite.js:439:15)
    at Mocha.mocha.loadFiles (/home/gil/dev/heig/amt/OverFlow/e2e/node_modules/codeceptjs/lib/mochaFactory.js:53:21)
    at Mocha.run (/home/gil/dev/heig/amt/OverFlow/e2e/node_modules/mocha/lib/mocha.js:970:10)
    at /home/gil/dev/heig/amt/OverFlow/e2e/node_modules/codeceptjs/lib/codecept.js:170:15
    at new Promise (<anonymous>)

Provide test source code if related

Content of search_test.js:

Feature('search');

Scenario('test search title', ({ I }) => {
    I.amOnPage('/')
    I.fillField('s', 'question 2')
    I.click('Search')
    I.see('Question 2')
    I.see('Contenu 2')
    I.dontSee('Question 1')
    I.dontSee('Contenu 1')
    I.dontSee('Question 3')
    I.dontSee('Contenu 3')
});

Scenario('test search author', ({ I }) => {
    I.amOnPage('/')
    I.fillField('s', 'gil')
    I.click('Search')
    I.see('Question 1')
    I.see('Contenu 1')
    I.dontSee('Question 2')
    I.dontSee('Contenu 2')
    I.dontSee('Question 3')
    I.dontSee('Contenu 3')
});

Details

• CodeceptJS version: 3.0.0
• NodeJS Version: 12.18.4
• Operating System: Manjaro Linux
• Using Playwright 1.5.1

Configuration file

const { setHeadlessWhen } = require('@codeceptjs/configure');

// turn on headless mode when running with HEADLESS=true environment variable
// export HEADLESS=true && npx codeceptjs run
setHeadlessWhen(process.env.HEADLESS);

exports.config = {
  tests: './*_test.js',
  output: './output',
  helpers: {
    Playwright: {
      url: 'http://localhost:9080/overflow',
      show: true,
      browser: 'chromium'
    }
  },
  include: {
    I: './steps_file.js'
  },
  bootstrap: null,
  mocha: {},
  name: 'e2e',
  translation: 'fr-FR',
  plugins: {
    pauseOnFail: {},
    retryFailedStep: {
      enabled: true
    },
    tryTo: {
      enabled: true
    },
    screenshotOnFail: {
      enabled: true
    }
  }
}

[lukyth]

I have this same error as well, with the project that I just setup an hour ago. I fixed this by adding mocha to package.json as well, with the version pin to "mocha": "8.1.3",. I think this is more likely an issue from mocha@8.2.0, which was released 3 days ago https://github.com/mochajs/mocha/releases/tag/v8.2.0.

[balsigergil]

Quick fix

Open your package.json and specify explicitly the version 8.1.3 of Mocha :

{
    "name": "codeceptjs-tests",
    "version": "0.1.0",
    "private": true,
    "scripts": {
        "codeceptjs": "codeceptjs run --steps",
        "codeceptjs:headless": "HEADLESS=true codeceptjs run --steps",
        "codeceptjs:ui": "codecept-ui --app"
    },
    "devDependencies": {
        "@codeceptjs/configure": "^0.6.0",
        "@codeceptjs/examples": "^1.2.1",
        "@codeceptjs/ui": "^0.4.1",
        "codeceptjs": "^3.0.0",
        "playwright": "^1.5.1",
        "mocha": "8.1.3"
    }
}

Apparently the bug occurs with the Mocha 8.2.0 update. This should temporarily fix the problem.