How do I run Karma coverage in Istanbul reporter?

How do I generate karma coverage 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)

type

  1. html (default)
  2. lcov (lcov and html)
  3. lcovonly.
  4. text.
  5. text-summary.
  6. cobertura (xml format supported by Jenkins)

How do I check karma coverage?

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.

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 I exclude files from Karma coverage?

Another trick can be to use the ! operator to exclude specific paths: preprocessors: { // source files, that you wanna generate coverage for // do not include tests or libraries ‘src/**/! (*spec|*mock).

How do you run code coverage?

Run your test scenario and in the “Test Tools” toolbar, click the icon “Code Coverage Results”.

To analyze Code Coverage on unit tests in Test Explorer:

  1. On the Test menu, choose Analyze Code Coverage.
  2. To see which lines have been run, choose Show Code Coverage Coloring Icon Show Code Coverage Coloring.
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What is karma in unit testing?

Karma is a node-based test tool that allows you to test your JavaScript codes across multiple real browsers. A node-based tool is any tool that needs the Nodejs engine installed for it to run and can be accessed (installed) through the node package manager (npm).

What is branches in karma code coverage?

Branch coverage is a metric that indicates whether all branches in a codebase are exercised by tests. A “branch” is one of the possible execution paths the code can take after a decision statement—e.g., an if statement—gets evaluated. … A different metric can be at 100%, while branch coverage is lower.

How do you install jasmine and karma?

Setting up

  1. Install Jasmine. Terminal / CMD npm install jasmine –save-dev.
  2. Install Karma. Terminal / CMD npm install jasmine-core karma karma-chrome-launcher karma-jasmine karma-jasmine-html-reporter karma-spec-reporter –save-dev.
  3. Install browserfly. …
  4. karma.conf.js.

What is Preprocessors in karma?

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: { ‘**/*. coffee’: [‘coffee’], ‘**/*.

What is karma mocha?

Karma allows testing your code on real browsers and real devices such as phones, tablets. It starts the browsers and runs the tests on them. Mocha is a feature-rich JavaScript test framework running on Node. js and in the browser, making asynchronous testing simple and fun.

What is Istanbul Instrumenter loader?

This is a Webpack loader that uses Istanbul to add code coverage instrumentation to your code. … Coverage Istanbul Loader is based on Istanbul Instrumenter Loader, but uses a newer version of the Istanbul API and has better support for source maps.

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How do I run a single spec file on karma?

Running a Karma Test Case for a Single Spec File / Single module

  1. Add the Spec name in the test. ts file under the src folder. import ‘zone.js/dist/zone-testing’; import { getTestBed } from ‘@angular/core/testing’; import { …
  2. Run ng test –code-coverage. Now Karma and Jasmine will check only Test-Demo. Spec. ts.

How do I run a single test file in karma?

context(‘./’, true, /. spec. ts$/); You should modify it’s RegExp to match the files that you’r willing to test, for example if you want to test a single file named “my.

What is single run in karma?

The property singleRun controls how Karma executes, if set to true , Karma will start, launch configured browsers, run tests and then exit with a code of either 0 or 1 depending on whether or not all tests passed.