TypeError: Cannot read property 'passes' of undefined

I’ve installed the latest mocha, mochawesome, cypress etc,but when i run ‘npm test’,No test report was generated. package.json:

{
  "name": "cypresstest",
  "version": "1.0.0",
  "main": "index.js",
  "dependencies": {
    "cypress": "^3.1.5"
  },
  "devDependencies": {
    "mocha": "^6.0.1",
    "mochawesome": "^3.1.1",
    "mochawesome-merge": "^1.0.5",
    "mochawesome-report-generator": "^3.1.5"
  },
  "scripts": {
    "cypress:open": "cypress open",
    "test": "cypress run --reporter mochawesome"
  },
  "author": "",
  "license": "ISC",
  "description": ""
}

exception:

TypeError: Cannot read property 'passes' of undefined
    at Spec.Base.epilogue (/Users/tianyawei/Applications/CypressTest/node_modules/mocha/lib/reporters/base.js:318:25)
    at Object.onceWrapper (events.js:316:30)
    at emitOne (events.js:120:20)
    at Runner.emit (events.js:210:7)
    at Reporter.emit (/Users/tianyawei/Library/Caches/Cypress/3.1.5/Cypress.app/Contents/Resources/app/packages/server/lib/reporter.js:239:55)
    at Object.server.startWebsockets.onMocha (/Users/tianyawei/Library/Caches/Cypress/3.1.5/Cypress.app/Contents/Resources/app/packages/server/lib/project.js:296:22)
    at Socket.<anonymous> (/Users/tianyawei/Library/Caches/Cypress/3.1.5/Cypress.app/Contents/Resources/app/packages/server/lib/socket.js:237:36)
    at emitTwo (events.js:125:13)
    at Socket.emit (events.js:213:7)
    at /Users/tianyawei/Library/Caches/Cypress/3.1.5/Cypress.app/Contents/Resources/app/packages/socket/node_modules/socket.io/lib/socket.js:503:12
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:180:9)

TypeError: Cannot read property 'passes' of undefined
    at Spec.Base.epilogue (/Users/tianyawei/Applications/CypressTest/node_modules/mocha/lib/reporters/base.js:318:25)
    at Object.onceWrapper (events.js:316:30)
    at emitOne (events.js:120:20)
    at Runner.emit (events.js:210:7)
    at Reporter.emit (/Users/tianyawei/Library/Caches/Cypress/3.1.5/Cypress.app/Contents/Resources/app/packages/server/lib/reporter.js:239:55)
    at Object.server.startWebsockets.onMocha (/Users/tianyawei/Library/Caches/Cypress/3.1.5/Cypress.app/Contents/Resources/app/packages/server/lib/project.js:296:22)
    at Socket.<anonymous> (/Users/tianyawei/Library/Caches/Cypress/3.1.5/Cypress.app/Contents/Resources/app/packages/server/lib/socket.js:237:36)
    at emitTwo (events.js:125:13)
    at Socket.emit (events.js:213:7)
    at /Users/tianyawei/Library/Caches/Cypress/3.1.5/Cypress.app/Contents/Resources/app/packages/socket/node_modules/socket.io/lib/socket.js:503:12
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:180:9)

npm ERR! Test failed.  See above for more details.
tianyaweideMacBook-Pro:CypressTest tianyawei$ 

[YOU54F]

Updated instructions

I’ve now updated, tested and released updated modules that fix this with mocha 6, but also retains backwards compatibility with mocha 5 and earlier versions.

https://www.npmjs.com/package/cypress-multi-reporters https://www.npmjs.com/package/mocha-junit-reporters

Example against Mocha 5 Example against Mocha 6

the changes required are minimal

npm i mocha-junit-reporters npm i cypress-multi-reporters

in reporterOpts.json

{
  "reporterEnabled": "mocha-junit-reporters, mochawesome",
  "mochaJunitReportersReporterOptions": {
    "mochaFile": "cypress/reports/junit/test_results[hash].xml",
    "toConsole": false
  },
  "mochawesomeReporterOptions": {
    "reportDir": "cypress/reports/mocha",
    "quiet": true,
    "overwrite": false,
    "html": false,
    "json": true
  }
} 

in cypress.json

{
  ...
  "reporter": "cypress-multi-reporters",
  "reporterOptions": {
    "configFile": "reporterOpts.json"
  }

See https://github.com/YOU54F/cypress-docker-typescript/pull/22/files

Hopefully the PR’s will be merged in the source repo’s soon but for now, enjoy

[stevenvanryckeghem]

Any news on this matter? Meanwhile Cypress 4.0 has been released and they now require Mocha 7.0.1 (https://docs.cypress.io/guides/references/migration-guide.html#Migrating-to-Cypress-4-0)