Error: Cannot find module 'jasmine-core'

I installed the following for testing:

"devDependencies": {
    "jasmine-core": "^2.4.1",
    "karma": "^0.13.22",
    "karma-jasmine": "^0.3.7",
    "karma-phantomjs-launcher": "^1.0.0"
}

After running karma start I get the following error:

Doing a search this is the first question with the same problem: karma start Cannot find module 'jasmine-core'

However I've tried both answers, installed jasmine-core globally and I already did npm install jasmine-core --save-dev :(

My test/index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Jasmine Spec Runner</title>
    <link href="testing.css" rel="stylesheet">
    <script src="../app/assets/js/libs/vendors.min.js"></script>
    <script src="../app/assets/js/bundle.js"></script>
</head>

<body>

    <div>
        <header>
            <h1>Jasmine tests for Dashboard</h1>
        </header>
    </div>

</body>
</html>

My karma.conf.js

// Karma configuration
// Generated on Mon Mar 14 2016 11:56:04 GMT-0500 (CDT)

module.exports = function(config) {
  config.set({

    // base path that will be used to resolve all patterns (eg. files, exclude)
    basePath: '.',


    // frameworks to use
    // available frameworks: https://npmjs.org/browse/keyword/karma-adapter
    frameworks: ['jasmine'],


    // list of files / patterns to load in the browser
    files: [
      'app/assets/js/bundle.js',
      'test/**/*.js'
    ],


    // list of files to exclude
    exclude: [
    ],


    // preprocess matching files before serving them to the browser
    // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
    preprocessors: {
    },


    // test results reporter to use
    // possible values: 'dots', 'progress'
    // available reporters: https://npmjs.org/browse/keyword/karma-reporter
    reporters: ['progress'],


    // web server port
    port: 9876,


    // enable / disable colors in the output (reporters and logs)
    colors: true,


    // level of logging
    // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
    logLevel: config.LOG_INFO,


    // enable / disable watching file and executing tests whenever any file changes
    autoWatch: false,


    // start these browsers
    // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
    browsers: ['PhantomJS'],


    // Continuous Integration mode
    // if true, Karma captures browsers, runs the tests and exits
    singleRun: true,

    // Concurrency level
    // how many browser should be started simultaneous
    concurrency: Infinity
  })
}

Just a guess, but try cleaning the npm cache, removing the node_modules and reinstalling everything from scratch:

$ rm -rf node_modules
$ npm cache clean
$ npm i

$ sudo npm uninstall -g jasmine-core 
$ sudo npm cache clean -f
$ sudo npm i -g jasmine-core

When declaring karma in package.json, then it's installed as a local dependency within the node_modules directory of your project. But running karma start from the console executes your globally installed karma. So there are two versions of Karma (local & global) and both have a dependency to jasmine-core, which needs to get installed.

When getting Cannot find module 'jasmine-core' on karma start, then the globally installed Karma misses "jasmine-core". So make sure you have this also installed globally. Best is to run the following commands:

npm install -g karma
npm install -g jasmine-core
npm install -g karma-jasmine

Afterwards you should be able to run karma start on a directory which has a karma.conf.js file.

You can also use a locally installed Karma. All you need to do is to install it this way:

npm install --save-dev karma 
npm install --save-dev jasmine-core
npm install --save-dev karma-jasmine

If you have done that, then make sure that you also execute it from it's path in node_modules:

./node_modules/karma/bin/karma start

If you start karma on the command line within a local directory, you should install karma-cli globally instead of karma.

Reference

Sibo Donald

Simply navigate to the karma-jasmine directory in the node modules:

cd node_modules/karma-jasmine

and run npm install. jasmine-core is in the devDependecies inside the package.json file. Navigate back to your root and re-run

karma start karma-conf.js

This should eliminate that error.

来源：https://stackoverflow.com/questions/35993875/error-cannot-find-module-jasmine-core

标签

node.js

testing

jasmine

karma-runner

karma-jasmine