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@cypress/code-coverage

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@cypress/code-coverage

Saves the code coverage collected during Cypress tests

  • 3.13.9
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What is @cypress/code-coverage?

@cypress/code-coverage is a plugin for Cypress that allows you to measure the code coverage of your application while running end-to-end tests. It integrates with popular code coverage libraries like Istanbul to provide detailed reports on which parts of your codebase are being exercised by your tests.

What are @cypress/code-coverage's main functionalities?

Setup Code Coverage

This code snippet shows how to set up the @cypress/code-coverage plugin in your Cypress configuration file. It requires the plugin and initializes it with the Cypress event handlers.

module.exports = (on, config) => {
  require('@cypress/code-coverage/task')(on, config);
  return config;
};

Instrument Application Code

This code demonstrates how to instrument your application code using Istanbul, which is a necessary step for collecting code coverage data. The instrumented code is then used in your application.

const istanbul = require('istanbul-lib-instrument');
const instrumenter = istanbul.createInstrumenter();
const instrumentedCode = instrumenter.instrumentSync(originalCode, filename);

Generate Coverage Reports

This code snippet shows how to generate HTML coverage reports using Istanbul. The coverage data collected during the tests is used to create a coverage map, which is then used to generate the report.

const { createCoverageMap } = require('istanbul-lib-coverage');
const coverageMap = createCoverageMap(global.__coverage__);
const report = require('istanbul-reports').create('html');
const context = require('istanbul-lib-report').createContext({ dir: './coverage' });
report.execute(context);

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Package last updated on 09 Dec 2024

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