How does code coverage work in angular 7?

The CLI can run unit tests and create code coverage reports. Code coverage reports show you any parts of our code base that may not be properly tested by your unit tests.

To generate a coverage report run the following command in the root of your project.

ng test --code-coverage

When the tests are complete, the command creates a new /coverage folder in the project. Open the index.html file to see a report with your source code and code coverage values.

If you want to create code-coverage reports every time you test, you can set the following option in the CLI configuration file, angular.json:

"test": {
  "options": {
    "codeCoverage": true
  }
}

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