Error: Karma plugin is meant to be used from within Angular CLI and will not work correctly outside of it

[arcovoltaico]

Hi,
I have trying many many configurations unsuccessfully. The one detailed below, throws an error when I am executing karma start.
arma plugin is meant to be used from within Angular CLI and will not work correctly outside of it

My package.json:

  "main": "main.js",
  "private": true,
  "scripts": {
    "postinstall": "npm run postinstall:electron && npx electron-builder install-app-deps",
    "postinstall:web": "node postinstall-web",
    "postinstall:electron": "node postinstall",
    "ng": "ng",
    "start": "npm run postinstall:electron && npm-run-all -p ng:serve electron:serve",
    "build": "npm run postinstall:electron && npm run electron:serve-tsc && ng build",
    "build:dev": "npm run build -- -c dev",
    "build:prod": "npm run build -- -c production",
    "ng:serve": "ng serve",
    "ng:serve:web": "npm run postinstall:web && ng serve -o",
    "electron:serve-tsc": "tsc -p tsconfig-serve.json",
    "electron:serve": "wait-on http-get://localhost:4200/ && npm run electron:serve-tsc && electron . --serve",
    "electron:local": "npm run build:prod && electron .",
    "electron:linux": "npm run build:prod && npx electron-builder build --linux",
    "electron:windows": "npm run build:prod && npx electron-builder build --windows",
    "electron:mac": "npm run build:prod && npx electron-builder build --mac",
    "test": "npm run postinstall:web && ng test",
    "e2e": "npm run postinstall:web && ng e2e"
  },
  "dependencies": {
    "@angular/animations": "^7.1.3",
    "@angular/cdk": "~7.3.7",
    "@angular/material": "^7.3.7",
    "@angular/platform-server": "^7.1.3",
    "angular2-fontawesome": "^5.2.1",
    "class-transformer": "^0.2.3",
    "electron": "^7.1.9",
    "electron-json-storage": "^4.1.6",
    "electron-simple-updater": "^1.5.0",
    "electron-window-state-manager": "^0.3.2",
    "font-awesome": "^4.7.0",
    "hammerjs": "^2.0.8",
    "karma-electron": "^6.3.0",
    "karma-electron-launcher": "^0.2.0",
    "ngx-mat-select-search": "^1.8.0",
    "ngx-webstorage": "^2.0.1",
    "ngx-youtube-player": "^7.1.1",
    "pusher-js": "^5.0.0",
    "reflect-metadata": "^0.1.13",
    "require-context": "^1.1.0",
    "rxjs-compat": "^6.3.3",
    "shelljs": "^0.8.3",
    "tslib": "^1.9.0"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "0.13.0",
    "@angular/cli": "^7.1.3",
    "@angular/common": "^7.1.3",
    "@angular/compiler": "^7.1.3",
    "@angular/compiler-cli": "^7.1.3",
    "@angular/core": "^7.1.3",
    "@angular/forms": "^7.1.3",
    "@angular/http": "^7.1.3",
    "@angular/language-service": "^7.1.3",
    "@angular/platform-browser": "^7.1.3",
    "@angular/platform-browser-dynamic": "^7.1.3",
    "@angular/router": "^7.1.3",
    "@ngx-translate/core": "10.0.1",
    "@ngx-translate/http-loader": "3.0.1",
    "@types/jasmine": "^3.3.8",
    "@types/jasminewd2": "2.0.3",
    "@types/node": "^10.14.13",
    "codelyzer": "^5.0.0",
    "core-js": "^2.6.1",
    "electron-builder": "^21.1.5",
    "electron-reload": "^1.4.1",
    "jasmine-core": "^3.4.0",
    "jasmine-spec-reporter": "^4.2.1",
    "karma": "^4.4.1",
    "karma-chrome-launcher": "^2.2.0",
    "karma-cli": "^2.0.0",
    "karma-coverage-istanbul-reporter": "~2.0.1",
    "karma-jasmine": "~2.0.1",
    "karma-jasmine-html-reporter": "^1.4.0",
    "npm-run-all": "4.1.3",
    "npx": "10.2.0",
    "protractor": "^5.4.1",
    "rxjs": "^6.3.3",
    "rxjs-tslint": "^0.1.6",
    "ts-node": "6.0.3",
    "tslint": "^5.12.0",
    "typescript": "3.1.6",
    "wait-on": "2.1.0",
    "webdriver-manager": "12.0.6",
    "webpack": "^4.27.1",
    "zone.js": "^0.8.26"
  }
}

At project level I have this karma.config.js

module.exports = require('./src/karma.conf.js');
pointing to:

module.exports = function (config) {
  config.set({
    basePath: '',
    frameworks: ['jasmine', '@angular-devkit/build-angular'],
    plugins: [
      require('karma-jasmine'),
      require('karma-electron'),
      require('karma-jasmine-html-reporter'),
      require('karma-coverage-istanbul-reporter'),
      require('@angular-devkit/build-angular/plugins/karma')
    ],
    client:{
      clearContext: false // leave Jasmine Spec Runner output visible in browser
    },
    coverageIstanbulReporter: {
      dir: require('path').join(__dirname, '../coverage'),
      reports: [ 'html', 'lcovonly' ],
      fixWebpackSourcePaths: true
    },
    reporters: ['progress', 'kjhtml'],
    port: 9876,
    colors: true,
    logLevel: config.LOG_INFO,
    autoWatch: true,
    browsers: ['AngularElectron'],
    singleRun: true,
    customLaunchers: {
      AngularElectron: {
        base: 'Electron',
        browserWindowOptions: {
          webPreferences: {
            nodeIntegration: true,
            allowRunningInsecureContent: true
          }
        }
      }
    },
    client: {
      useIframe: false
    }
  });
}; 

[twolfson]

I'm pretty confident this error is coming from @angular-devkit packages in karma.conf (if have doubts, I recommend using grep with the error message)

Based on what it says, it seems like the package wants to use ng test instead of karma start (I'm guessing ng test will wrap karma start):

https://angular.io/cli