@cypress/snapshot

    2.1.7 • Public • Published

    @cypress/snapshot

    Adds value / object / DOM element snapshot testing support to Cypress test runner

    NPM

    Build status semantic-release renovate-app badge

    Note

    Please take a look at a few other Cypress snapshot plugins: cypress-plugin-snapshots, cypress-image-snapshot.

    Install

    Requires Node version 6 or above.

    npm install --save-dev @cypress/snapshot

    Use

    After installing, add the following to your cypress/support/commands.js file

    require('@cypress/snapshot').register()

    This registers a new command to create new snapshot or compare value to old snapshot

    describe('my tests', () => {
      it('works', () => {
        cy.log('first snapshot')
        cy.wrap({ foo: 42 }).snapshot()
        cy.log('second snapshot')
        cy.wrap({ bar: 101 }).snapshot()
      })
    })
     
    describe('focused input field', () => {
      it('is empty and then typed into', () => {
        cy.visit('http://todomvc.com/examples/react/')
        cy
          .focused()
          .snapshot('initial')
          .type('eat healthy breakfast')
          .snapshot('after typing')
      })
    })

    By default, the snapshot object can be found in file snapshots.js. In the above case it would look something like this

    module.exports = {
      "focused input field": {
        "is empty and then typed into": {
          "initial": {
            "tagName": "input",
            "attributes": {
              "class": "new-todo",
              "placeholder": "What needs to be done?",
              "value": ""
            }
          },
          "after typing": {
            "tagName": "input",
            "attributes": {
              "class": "new-todo",
              "placeholder": "What needs to be done?",
              "value": "eat healthy breakfast"
            }
          }
        }
      },
      "my tests": {
        "works": {
          "1": {
            "foo": 42
          },
          "2": {
            "bar": 101
          }
        }
      }
    }

    If you change the site values, the saved snapshot will no longer match, throwing an error

    Snapshot mismatch

    Click on the SNAPSHOT step in the Command Log to see expected and current value printed in the DevTools.

    Options

    You can control snapshot comparison and behavior through a few options.

    cy.get(...).snapshot({
      name: 'human snapshot name', // to use in the snapshot file
      json: false                  // convert DOM elements into JSON
                                   // when storing in the snapshot file
    })

    Configuration

    This module provides some configuration options:

    useRelativeSnapshots

    Set to true in order to store your snapshots for each test run next to the inital test caller rather than at the base working directory.

    Note: requires the readFileMaybe plugin to be configured see https://on.cypress.io/task#Read-a-file-that-might-not-exist

    snapshotFileName

    Set to a string to name your snapshot something other than 'snapshots.js'

    Usage

    Set the configuration options as part of the Cypress config. See https://docs.cypress.io/guides/references/configuration.html

    Debugging

    To debug this module run with environment variable DEBUG=@cypress/snapshot

    Small print

    Author: Gleb Bahmutov <gleb@cypress.io> © Cypress.io 2017

    License: MIT - do anything with the code, but don't blame u if it does not work.

    Support: if you find any problems with this module, email / tweet / open issue on Github

    MIT License

    Copyright (c) 2017 Cypress.io <gleb@cypress.io>

    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

    Install

    npm i @cypress/snapshot

    DownloadsWeekly Downloads

    32,485

    Version

    2.1.7

    License

    MIT

    Unpacked Size

    101 kB

    Total Files

    6

    Last publish

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