Adds value / object / DOM element snapshot testing support to Cypress test runner
Please take a look at a few other Cypress snapshot plugins: cypress-plugin-snapshots, cypress-image-snapshot.
Requires Node version 6 or above.
npm install --save-dev @cypress/snapshotAfter 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
Click on the SNAPSHOT step in the Command Log to see expected and current value printed in the DevTools.
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
})This module provides some configuration options:
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
Set to a string to name your snapshot something other than 'snapshots.js'
Set the configuration options as part of the Cypress config. See https://docs.cypress.io/guides/references/configuration.html
To debug this module run with environment variable DEBUG=@cypress/snapshot
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
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.
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