Cypress Quarantine

Cypress Quarantine

DeploySentinel Cypress Quarantine (opens in a new tab) is a plugin for Cypress that helps developers quarantine tests dynamically. With this plugin, you can dynamically skip tests that are unstable, flaky, or not ready to run based off an API call made at test time.


To install the Cypress plugin, run:

npm install -D @deploysentinel/cypress-quarantine


Add Support File

In your Cypress project's support file (ex. cypress/support/index.js) add:

// ❗ Must be declared at the top of the file ❗
import "@deploysentinel/cypress-quarantine/support";
import "./commands";

Add Plugin

In your Cypress project's plugin file (ex. cypress.config.ts) add:

import { defineConfig } from 'cypress';
import cyQuarantine from '@deploysentinel/cypress-quarantine/plugin';
export default defineConfig({
  e2e: {
    setupNodeEvents(on, config) {
      cyQuarantine(on, config, {
        // your custom API endpoint that returns which tests to skip per spec file (required)
        apiUrl: 'http://localhost:8000/ci/quarantine-tests',
        meta: {
          testFramework: 'cypress',
          // or any custom static metadata (optional)
        // specify the method that generates unique test id based on titles
        // ex: titles: ['describe A', 'test case B'] -> 'describe A > test case B' (stored in db)
        // default to only test case name (leaf node); 'test case B' in this case
        getTestId: (titles: string[]) => titles.join(' > '),
        topLevelKey: 'xxx', // (optional)
      return config;

How Does it Work ?

When you use the plugin, it will make an POST API request to your server to retrieve quarantined tests for a specific file. The resulting API response should look like

    'describe A > test case B': true,
    'describe A > test case C': false,

The key is a unique test ID derived from getTestId. And the value indicates whether the test case should be skipped (quarantined).

Top Level API Key

In case the API response has top level key attached, for example:

    data: {
        'describe A > test case B': true,
        'describe A > test case C': false,

You can set topLevelKey field in config to data in this case.

Custom Metadata

The API request body includes a few default custom fields by default. You can utilize this information to develop a test quarantine algorithm.

    cypressVesion: string;
    // test environment variables
    envs: Record<string, string>;
    // git information
    commitInfo: {
      authorEmail: string | null;
      authorName: string | null;
      branch: string | null;
      defaultBranch: string | null;
      message: string | null;
      remoteBranch: string | null;
      remoteOrigin: string | null;
      sha: string | null;
      timestamp: number | null;
      metadata: unknown | null;