What is karma preprocessor?

Preprocessors in Karma allow you to do some work with your files before they get served to the browser. These are configured in the preprocessors block of the configuration file: preprocessors: { ‘**/*.

What is karma code?

Karma is essentially a tool which spawns a web server that executes source code against test code for each of the browsers connected. The results of each test against each browser are examined and displayed via the command line to the developer such that they can see which browsers and tests passed or failed.

What is karma coverage Istanbul reporter?

A karma reporter that uses the latest istanbul 1. x APIs (with full sourcemap support) to report coverage.

How do you generate a karma report?

Karma can generate code coverage using awesome Istanbul. If you want to generate the coverage, you need to configure up to three parts: preprocessor coverage (required) reporter coverage (required)


  1. html (default)
  2. lcov (lcov and html)
  3. lcovonly.
  4. text.
  5. text-summary.
  6. cobertura (xml format supported by Jenkins)
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What is karma configuration file in angular?

Karma is a task runner for our tests. It uses a configuration file in order to set the startup file, the reporters, the testing framework, the browser among other things. The rest of the dependencies are mainly reporters for our tests, tools to use karma and jasmine and browser launchers.

How do I run Karma coverage?

To add karma-coverage definition to the configuration file

  1. Open karma. conf. …
  2. Locate the reporters definition and add coverage to the list of values in the format: reporters: [‘progress’, ‘coverage’] …
  3. Add a preprocessors definition and specify the coverage scope in the format: preprocessors: {‘**/*.js’: [‘coverage’]}


What is karma JS used for?

Karma is a test runner for JavaScript that runs on Node. js. It is very well suited to testing AngularJS or any other JavaScript projects. Using Karma to run tests using one of many popular JavaScript testing suites (Jasmine, Mocha, QUnit, etc.)

What is Istanbul code coverage?

Istanbul is a test coverage tool that works with many different frameworks. It tracks which parts of your code are executed by your unit tests. Thus, you can use Istanbul to view and see coverage gaps, or you can integrate it integrated into your CI pipeline to enforce coverage levels.

How do I use karma coverage in Istanbul reporter?

Babel users should use the istanbul babel plugin to instrument your code and webpack + typescript users should use the coverage-istanbul-loader and then use this karma reporter to do the actual reporting. See the test config for an e2e example of how to combine them.

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What is Karma Jasmine HTML?

Reporter that dynamically shows tests results at debug. You can also run a describe block, or a single test. …

How do I check my karma coverage?

Code coverage enforcementlink

To enable this, open the Karma test platform configuration file, karma. conf. js , and add the check property in the coverageReporter: key. The check property causes the tool to enforce a minimum of 80% code coverage when the unit tests are run in the project.

How do you use a protractor as a beautiful reporter?

Steps to generate Protractor Beautiful Reporter:

  1. Step 1: Open command prompt and type the following code. npm install protractor-beautiful-reporter –save-dev. …
  2. Step 2: Open protractor conf.js file. …
  3. Step 3: Run your Protractor tests with the above config.

How do you generate a code coverage report?

Generate the report

  1. From the main menu, select Run | Generate Coverage Report, or click. in the Coverage tool window. …
  2. In the Generate Coverage Report dialog, specify the directory in which the generated report should be stored, and optionally select the Open generated HTML in browser checkbox. …
  3. Click Save.


What is difference between Jasmine and karma?

We can run Jasmine tests in a browser ourselves by setting up and loading a HTML file, but more commonly we use a command-line tool called Karma. Karma handles the process of creating HTML files, opening browsers and running tests and returning the results of those tests to the command line.

How do I change karma version?

In changing the version manually in package. json you will tell npm to install that version (or higher) but it won’t actually be installed until you run the npm install/update. If you want to install a different package or version from what’s declared in your package.

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How do I install karma?

Open the Terminal and start the karma.conf.js generation wizard by typing one of the following depending on your operating system:

  1. For macOS and Linux: ./node_modules/karma/bin/karma init.
  2. For Windows: npm install -g karma-cli. karma init.


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