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We aim to keep the code coverage of Electron high. We ask that all pull request not only pass all existing tests, but ideally also add new tests to cover changed code and new scenarios. Ensuring that we capture as many code paths and use cases of Electron as possible ensures that we all ship apps with fewer bugs.

This repository comes with linting rules for both JavaScript and C++ – as well as unit and integration tests. To learn more about Electron's coding style, please see the coding-style document.


To ensure that your changes are in compliance with the Electron coding style, run npm run lint, which will run a variety of linting checks against your changes depending on which areas of the code they touch.

Many of these checks are included as precommit hooks, so it's likely you error would be caught at commit time.

Unit Tests

If you are not using build-tools, ensure that the name you have configured for your local build of Electron is one of Testing, Release, Default, or you have set process.env.ELECTRON_OUT_DIR. Without these set, Electron will fail to perform some pre-testing steps.

To run all unit tests, run npm run test. The unit tests are an Electron app (surprise!) that can be found in the spec folder. Note that it has its own package.json and that its dependencies are therefore not defined in the top-level package.json.

To run only specific tests matching a pattern, run npm run test -- -g=PATTERN, replacing the PATTERN with a regex that matches the tests you would like to run. As an example: If you want to run only IPC tests, you would run npm run test -- -g ipc.

Node.js Smoke Tests

If you've made changes that might affect the way Node.js is embedded into Electron, we have a test runner that runs all of the tests from Node.js, using Electron's custom fork of Node.js.

To run all of the Node.js tests:

$ node script/node-spec-runner.js

To run a single Node.js test:

$ node script/node-spec-runner.js parallel/test-crypto-keygen

where the argument passed to the runner is the path to the test in the Node.js source tree.

Testen auf Windows 10-Geräten

Zusätzliche Schritte um den Unit-Test auszuführen:

  1. Visual Studio 2019 muss installiert sein.

  2. Node-Header müssen für Ihre Konfiguration kompiliert werden.

    ninja -C out\Testing electron:node_headers
  3. Die electron.lib muss als node.lib kopiert werden.

    cd out\Testing mkdir gen\node_headers\Release copy electron.lib gen\node_headers\Release\node.lib

Fehlende Schriften

Some Windows 10 devices do not ship with the Meiryo font installed, which may cause a font fallback test to fail. To install Meiryo:

  1. Drücken Sie die Window-Taste und suchen Sie nach Optionale Funktionen verwalten.
  2. Klicken Sie auf Funktion hinzufügen.
  3. Wählen Sie japanische Zusatzschrift aus und klicken Sie auf installieren.


Some tests which rely on precise pixel measurements may not work correctly on devices with Hi-DPI screen settings due to floating point precision errors. To run these tests correctly, make sure the device is set to 100% scaling.

To configure display scaling:

  1. Drücken Sie die Window-Taste und suchen Sie nach Anzeigeeinstellungen.
  2. Stellen Sie unter Skalieren und Layout sicher, dass das Gerät auf 100% gesetzt ist.