Combining Coverage from Cypress and Jest in an Nx Project

2023/07/04

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Coverage is an essential aspect of testing that helps developers determine how much of their codebase is covered by tests. In an Nx project, combining coverage from different testing techniques, such as Cypress (E2E and component tests) and Jest, can provide a comprehensive picture of the tested code. This article by Christian Lüdemann explains how to set up coverage for Jest tests, as well as Cypress component tests, and merge the coverage results into one report.

To enable coverage for Jest tests, simply configure the Jest properties in the project's configuration file. Running nx test will generate the coverage files automatically.

For Cypress component tests, manual configuration is required. A custom webpack configuration using the @jsdevtools/coverage-istanbul-loader loader is needed. The article provides a sample webpack config that can be used with the @angular-builders/custom-webpack:browser builder.

Additionally, the @cypress/code-coverage package is used to generate coverage reports for Cypress tests. By adding a few lines of code to the component and Cypress configuration files, developers can run component tests and generate coverage reports.

By following the steps outlined in this article, developers can combine coverage from Cypress and Jest in an Nx project, providing a comprehensive view of their test coverage.