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In order to run unit tests only once, execute command yarn jest. If you want to run server, which watches for changes in tests, run yarn jest --watch.

Unit tests are used for testing React components, Redux actions, sagas, reducers, selectors. Unit tests are written in the .spec.ts files.

Integration tests are implemented using Cypress framework. In order to run all integration tests, execute command yarn ci:test. If you already have Webpack server running, it's better to execute command yarn cypress open.