cypress-map  !cypress version

> Extra Cypress query commands for v12+

- 📺 Watch the videos:
- Cypress v12 Querying Commands Introduction
- Confirm Table Column
- Use cypress-map Queries To Validate A Row In A Table
- How To Check Visibility Of Many Elements
- Pick A Random Menu Link
- Confirm The Same Text In A Couple Of Elements
- Map Input Elements Values
- Iterate Over DOM Elements Using cy.each, jQuery each and map, and cypress-map Plugin Commands
- Confirm Sorted Attributes
- Query Multiple Elements In Order
- Element's Text Becomes Stable
- Cut Cypress Execution In Half By Running Tests In Parallel Using cypress-split And GitHub Actions
- Fix GitHub Actions Node Version Warnings
- Use cy.second and cy.third Commands
- Remove Class From Sampled Elements
- Check Multiple Properties At Once Using cy.difference Query
- cy.difference Command With Predicates
- The Possess Assertion From cypress-map Plugin
- Custom Should Read Assertion From Cypress-map Plugin
- Introducing The cy.elements Query Command From Cypress-map Plugin
- cy.mapChain Custom Command Examples
- 📝 Read the blog posts
- Cypress V12 Is A Big Deal
- Crawl Weather Using Cypress
- Pass Values Between Cypress Tests
- Do Not Use SHA To Compare HTML During E2E Tests
- Cypress Flakiness Examples
- Solve Tough Pagination Cases Using Cypress
- Check Fees And Totals Using Cypress
- Custom Cypress Should Read Assertion
- Check Data Using Page Objects And Higher Order Functions
- 🎓 Covered in my course Cypress Plugins
- Lesson l1: Confirm the attribute of the last item
- Lesson l2: Confirm the extracted list of texts
- Lesson l3: Confirm the last two items in the extracted lis
- Lesson l4: Confirm the list of attributes
- Lesson l5: Confirm the sum of attributes
- Lesson l6: Compare the sum of attributes to the total
- Lesson l7: Debug chained queries using tap
- Lesson l8: Get the raw DOM element at index k
- Lesson l9: Confirm the number of elements with the given attribute
- Lesson l10: Check the parsed attribute value
- Lesson l11: Extract and convert prices
- Lesson l12: Find the element with the smallest attribute value
- Lesson l13: Check each item's text
- Lesson l14: Flexible logging using cy.print command
- Lesson l15: Confirm HTML table values
- Lesson l17: Control the network and confirm the table
- 🎓 Covered in my course Cypress Network Testing Exercises
- Bonus 92: Map each item from the list using Cy commands
- Bonus 100: Check all network responses at once with auto retries
- 🎓 Covered in my course Testing The Swag Store
- Lesson 23: Simplify getting attribute from a list of elements
- Bonus 36: Manipulate data- attributes using cypress-map methods
- Bonus 41: Pick and confirm a random product
- Bonus 42: Add 3 random items to the cart
- Bonus 127: Parse URLSearchParams with retries

Install

Add this package as a dev dependency:

``
$ npm i -D cypress-map


or using Yarn

`js
import 'cypress-map'
`

Alternative: import only the query commands you need:

`js
import 'cypress-map/commands/map'
import 'cypress-map/commands/tap'
// and so on, see the /commands folder
`

API

$3

`js
const double = (n) => n * 2
cy.wrap(100).apply(double).should('equal', 200)
`

It works like cy.then but cy.apply(fn) is a query command. Function fn should be synchronous, pure function that only uses the subject argument and returns new value The function callback fn cannot use any Cypress commands cy.

You can pass additional _left_ arguments to the callback function. Then it puts the subject as _last argument_ before calling the function:

`js
cy.wrap(8).apply(Cypress._.subtract, 4).should('equal', -4)
`

Yields the subject of the same type as the fn return.

$3

Without arguments, cy.applyRight works the same as cy.apply. If you pass arguments, then the subject plus the arguments become the arguments to the callback. The subject is at the _left_ (first) position

`js
cy.wrap(8).applyRight(Cypress._.subtract, 4).should('equal', 4)
// same as
cy.wrap(8)
.apply((subject) => Cypress._.subtract(subject, 4))
.should('equal', 4)
`

$3

Sometimes you have the callback to apply, and you know the first argument(s), and just need to put the subject at the last position. This is where you can partially apply the known arguments to the given callback.

`js
// the Cypress._.add takes to arguments (a, b)
// we know the first argument a = 5
// so we partially apply it and wait for the subject = b argument
cy.wrap(100).partial(Cypress._.add, 5).should('equal', 105)
// same as
cy.wrap(100)
.apply((subject) => Cypress._.add(5, subject))
.should('equal', 105)
`

$3

If the current subject is an array, or a jQuery object, you can apply the given callback with arguments to the _first_ item or element. The current subject will be the _last_ argument.

`js
// cy.applyToFirst(callback, ...args)
cy.wrap(Cypress.$('

`js
// cy.applyToFirstRight(callback, ...args)
cy.wrap(Cypress.$('

`js
cy.get(selector).invokeFirst('getBoundingClientRect')
// compute the vertical center for example
`

$3

Transforms every object in the given collection by running it through the given callback function. Can also map each object to its property. An object could be an array or a jQuery object.

`js
// map elements by invoking a function
cy.wrap(['10', '20', '30']).map(Number) // [10, 20, 30]
// map elements by a property
cy.get('.matching')
.map('innerText')
.should('deep.equal', ['first', 'third', 'fourth'])
`

You can even map properties of an object by listing callbacks. For example, let's convert the age property from a string to a number for a single object:

`js
cy.wrap({
age: '42',
lucky: true,
})
.map({
age: Number,
})
.should('deep.equal', {
age: 42,
lucky: true,
})
`

If the subject is an array, then mapping will go through each item

`js
const people = [...]
// each item in the "people" array
// has "age" property that we want to convert from a string
// to a number
cy.wrap(people)
.map({
age: parseInt
})
`

You can avoid any conversion to simply pick the list of properties from an object

`js
const person = {
name: 'Joe',
age: 21,
occupation: 'student',
}
cy.wrap(person).map(['name', 'age']).should('deep.equal', {
name: 'Joe',
age: 21,
})
`

You can extract nested paths by using "." in your property path

`js
cy.wrap(people)
.map('name.first')
.should('deep.equal', ['Joe', 'Anna'])
// equivalent to
cy.wrap(people)
.map('name')
.map('first')
.should('deep.equal', ['Joe', 'Anna'])
`

If you want to pick multiple deep properties, the last segment will be the output property name

`js
// each person has nested objects like
// { name: { first: '...', last: '...', }, human: { age: xx, ... } }
cy.wrap(people).map(['name.first', 'human.age'])
// each object will have "first" and "age" properties
`

If the subject is an array of arrays, you can get each element by index

`js
cy.wrap([
[1, 2, 3],
[4, 5, 6],
])
.map(1)
.should('deep.equal', [2, 5])
`

$3

`js
cy.get('#items li')
.find('.price')
.map('innerText')
.mapInvoke('replace', '$', '')
.mapInvoke('trim')
`

$3

`js
cy.get('#items li')
.find('.price')
.map('innerText')
.mapInvoke('replace', '$', '')
.map(parseFloat)
.reduce((max, n) => (n > max ? n : max))
// yields the highest price
`

You can provide the initial accumulator value

`js
cy.wrap([1, 2, 3])
.reduce((sum, n) => sum + n, 10)
.should('equal', 16)
`

See reduce.cy.js

$3

`js
cy.get('#items li')
.find('.price')
.map('innerText')
.tap() // console.log by default
.mapInvoke('replace', '$', '')
.mapInvoke('trim')
// console.info with extra label
.tap(console.info, 'trimmed strings')
`

Notice: if the label is provided, the callback function is called with label and the subject.

$3

A retryable query that calls the given constructor function using the new keyword and the current subject as argument.

`js
cy.wrap('Jan 1, 2019')
// same as "new Date('Jan 1, 2019')"
.make(Date)
.invoke('getFullYear')
.should('equal', 2019)
`

$3

If you want to construct multiple items by mapping over the items in the current subject, use the cy.mapMake(constructorFn) query.

`js
const dates = ['Jan 1, 2019', 'Feb 2, 2020', 'Mar 3, 2021']
cy.wrap(dates)
.mapMake(Date)
.print()
.mapInvoke('getFullYear')
.should('deep.equal', [2019, 2020, 2021])
`

You can pass additional arguments

`js
.mapMake(constructorFn, 1, 2, 3)
// for each item "x" inside the subject,
// the constructor will be called
// like "new constructorFn(x, 1, 2, 3)
`

$3

A better cy.log: yields the value, intelligently stringifies values using % and string-format notation.

`js
cy.wrap(42)
.print() // "42"
// and yields the value
.should('equal', 42)
// pass formatting string
cy.wrap(42).print('the answer is %d') // "the answer is 42"
cy.wrap({ name: 'Joe' }).print('person %o') // 'person {"name":"Joe"}'
// use {0} with dot notation, supported deep properties
// https://github.com/davidchambers/string-format
cy.wrap({ name: 'Joe' }).print('person name {0.name}') // "person name Joe"
// print the length of an array
cy.wrap(arr).print('array length {0.length}') // "array length ..."
// pass your own function to return formatted string
cy.wrap(arr).print((a) => array with ${a.length} items)
// if you return a non-string, it will attempt to JSON.stringify it
cy.wrap(arr).print((list) => list[2]) // JSON.stringify(arr[2])
`

See print.cy.js for more examples

$3

Finds a single item in the subject. Assumes subject is an array or a jQuery object. Uses Lodash _.find method.

`js
// using predicate function
const isThree = n => n === 3
// predicate function receives every item from the array
cy.wrap([...]).findOne(isThree).should('equal', 3)
// using partial known properties of an object
cy.wrap([...]).findOne({ name: 'Anna' }).should('have.property', 'name', 'Anna')
`

You can find one element from the jQuery subject

`js
// find one element with exact text
cy.get('...')
.findOne((el) => el.innerText === 'Item C')
.should('have.text', 'Item C')
`

Note: if you pass a string predicate, it will be used to find one element with exact inner text match

`js
.findOne(el => el.innerText === 'Item C')
// is the same as
.findOne('Item C')
`

See find-one.cy.js

$3

`js
cy.get('.matching')
.map('innerText')
.primo()
.invoke('toUpperCase')
.should('equal', 'FIRST')
`

See primo.cy.js

$3

Works like cy.its for objects, but gets the property for jQuery objects, which cy.its does not

`js
cy.get('#items li.matching')
.last()
.prop('ariaLabel')
.should('equal', 'four')
`

See prop.cy.js

$3

Changes a single property inside the subject by running it through the given callback function. Useful to do type conversions, for example, let's convert the "age" property to a Number

`js
cy.wrap({ age: '20' })
.update('age', Number)
.should('deep.equal', { age: 20 })
`

$3

Returns a DOM element from jQuery object at position k. Returns an item from array at position k. For negative index, counts the items from the end.

`js
cy.get('#items li').at(-1).its('innerText').should('equal', 'fifth')
`

See at.cy.js

$3

Returns a randomly picked item or element from the current subject

`js
cy.get('#items li').sample().should('have.text', 'four')
`

If you pass a positive number, then it picks multiple elements or items

`js
// yields jQuery object with 3 random items
cy.get('#items li').sample(3).should('have.length', 3)
`

See sample.cy.js

$3

Yields the second element from the current subject. Could be an element or an array item.

`js
cy.get('#items li').second().should('have.text', 'second')
`

See second.cy.js

$3

Yields the third element from the current subject. Could be an element or an array item.

`js
cy.get('#items li').third().should('have.text', 'third')
`

See third.cy.js

$3

Saves current subject in Cypress.env object. Note: Cypress.env object is reset before the spec run, but the changed values are passed from test to test. Thus you can easily pass a value from the first test to the second.

`js
it('saves value in this test', () => {
cy.wrap('hello, world').asEnv('greeting')
})

it('saved value is available in this test', () => {
expect(Cypress.env('greeting'), 'greeting').to.equal('hello, world')
})
`

Do you really want to make the tests dependent on each other?

$3

Often we need to find a list of elements with some sub-parts. The query cy.elements uses the parent selector plus child selectors and returns an array of arrays of strings.

Given this HTML

`html


• Item A 1


• Item B 2


• Item C 3


• Item D 4

Find all items and the numbers. The parent selector is #tasks li, and inside the parts we want to get are .k and .name (in this order)

`js
cy.elements('#tasks li', '.k', '.name').should('deep.equal', [
['1', 'Item A'],
['2', 'Item B'],
['3', 'Item C'],
['4', 'Item D'],
])
`

$3

Queries the page using multiple selectors and returns the found elements _in the specified_ order, no matter how they are ordered in the document. Retries if any of the selectors are not found.

`js
cy.getInOrder('selector1', 'selector2', 'selector3', ...)
// yields a single jQuery subject with
// elements for selector1
// and selector2,
// and selector3, etc
`

You can also use a single array of selector strings

`js
cy.getInOrder(['h1', 'h2', 'h3'])
`

Supports parent subject

`js
cy.get('...').getInOrder('...', '...')
`

$3

Sometimes you just want to wait until the element is stable. For example, if the element's text content does not change for N milliseconds, then we can consider the element to be text stable.

`js
cy.get('#message').stable('text')
// yields the element
`

Supported types: text, value (for input elements), css, and element (compares the element reference)

You can control the quiet period (milliseconds), and pass the log and the timeout options

`js
// stable for 500ms
// without logging
// with maximum retries duration of 6 seconds
cy.get('#message').stable('text', 500, { log: false, timeout: 6_000 })
`

When checking the CSS property to be stable, provide the name of the property:

`js
// retries until the CSS animation finishes
// and the background color is red
cy.get('#message')
.stable('css', 'background-color', 100)
// yields the element
.should('have.css', 'background-color', 'rgb(255, 0, 0)')
`

See stable.cy.js and stable-css.cy.js

$3

experimental

Retries until the element with the given selector detaches from DOM.

`js
cy.contains('Click to re-render').click()
cy.detaches('#list')
`

Sometimes the detachment can happen right with the action and the cy.detaches(selector) is _too late_. If you know the detachment might have already happened, you need to prepare for it by using an alias stored in the Cypress.env object:

`js
cy.get('#name2').asEnv('name')
cy.contains('Click to remove Joe').click()
cy.detaches('@name')
`

The jQuery object will be stored inside the Cypress.env under the name property.

See detach.cy.js

$3

Computes an object/arrays of the difference with the current subject object/array.

`js
cy.wrap({ name: 'Joe', age: 20 })
.difference({ name: 'Joe', age: 30 })
.should('deep.equal', { age: { actual: 20, expected: 30 } })
`

You can use synchronous predicate functions to validate properties

`js
// confirm the value of the "age" property
// is larger than 15
.difference({ name: 'Joe', age: (n) => n > 15 })
`

Reports missing and extra properties. See difference.cy.js

Note: use have.length to validate the number of items in an array:

`js
// let's check if there are 3 objects in the array
// INSTEAD OF THIS
.difference([Cypress._.object, Cypress._.object, Cypress._.object])
// USE AN ASSERTION
.should('have.length', 3)
`

You can check each item in the array subject using values / predicates from the expected object.

`js
// list of people objects
cy.wrap(people)
.difference({
name: Cypress._.isString,
age: (age) => age > 1 && age < 100,
})
.should('be.empty')
`

$3

📝 to learn more about cy.table command, read the blog post Test HTML Tables Using cy.table Query Command.

Extracts all cells from the current subject table. Yields a 2D array of strings.

`js
cy.get('table').table()
`

You can slice the table to yield just a region .table(x, y, w, h)

!Table

For example, you can get 2 by 2 subregion

`js
cy.get('table')
.table(0, 2, 2, 2)
.should('deep.equal', [
['Cary', '30'],
['Joe', '28'],
])
`

See the spec table.cy.js for more examples.

Tip: you can combine cy.table with cy.map, cy.mapInvoke to get the parts of the table. For example, the same 2x2 part of the table could be extracted with:

`js
cy.get('table')
.table()
.invoke('slice', 2, 4)
.mapInvoke('slice', 0, 2)
.should('deep.equal', [
['Cary', '30'],
['Joe', '28'],
])
`

Tip 2: to get just the headings row, combine .table and .its queries

`js
cy.get('table')
.table(0, 0, 3, 1)
.its(0)
.should('deep.equal', ['Name', 'Age', 'Date (YYYY-MM-DD)'])
`

To get the last row, you could do:

`js
cy.get('table').table().invoke('slice', -1).its(0)
`

To get the first column joined into a single array (instead of array of 1x1 arrays)

`js
cy.get('table')
.table(0, 1, 1) // skip the heading "Name" cell
// combine 1x1 arrays into one array
.invoke('flatMap', Cypress._.identity)
.should('deep.equal', ['Dave', 'Cary', 'Joe', 'Anna'])
`

$3

A query to convert special DOM objects into plain objects. For example, to convert DOMStringMap instance into a plain object compatible with deep.equal assertion we can do

`js
cy.get('article')
.should('have.prop', 'dataset')
.toPlainObject()
.should('deep.equal', {
columns: '3',
indexNumber: '12314',
parent: 'cars',
})
`

By default uses JSON stringify and parse back. If you want to convert using entries and fromEntries, add an argument:

`js
cy.wrap(new URLSearchParams(searchParams)).toPlainObject('entries')
`

$3

In Cypress v12 cy.invoke became a query, which made working with asynchronous methods really unwieldy. The cy.invokeOnce is a return the old way of calling the method and yielding the resolved value.

`js
cy.wrap(app)
// app.fetchName is an asynchronous method
// that returns a Promise
.invokeOnce('fetchName')
.should('equal', 'My App')
`

See the spec invoke-once.cy.js for more examples.

$3

This plugin includes a few useful assertions

$3

Assertion

Checks the exact text match or regular expression for a single element or multiple ones

`js
cy.get('#name').should('read', 'Joe Smith')
cy.get('#ages').should('read', ['20', '35', '15'])

// equivalent to
cy.get('#name').map('innerText').should('deep.equal', ['Joe Smith'])
cy.get('#ages')
.map('innerText')
.should('deep.equal', ['20', '35', '15'])
`

Using with regular expression or a mix of strings and regular expressions

`js
cy.get('#name').should('read', /\sSmith$/)
cy.get('#ages').should('read', [/^\d+$/, '35', '15'])
`

The assertion fails if the number of elements does not match the expected number of strings.

$3

Assertion

Checks if the subject has the given property. Can check the property value. Yields the original subject

`js
// check if the subject has the "name" property
cy.wrap({ name: 'Joe' }).should('possess', 'name')
// yields the { name: 'Joe' } object

// check if the subject has the "name" property with the value "Joe"
cy.wrap({ name: 'Joe' }).should('possess', 'name', 'Joe')
// yields the { name: 'Joe' } object
`

The assertion supports deep object access using the dot notation

`js
cy.wrap({ user: { name: 'Joe' } }).should(
'possess',
'user.name',
'Joe',
)
`

The assertion supports arrays using [ ] or simple dot notation

`js
cy.wrap({ users: [{ name: 'Joe' }, { name: 'Jane' }] })
.should('possess', 'users[0].name', 'Joe') // [] notation
.and('possess', 'users.1.name', 'Jane') // simple dot notation
`

You can also pass a predicate function instead of the value to check the property value against it.

`js
const isDrinkingAge = (years) => years > 21
cy.wrap({ age: 42 }).should('possess', 'age', isDrinkingAge)
// yields the original subject
`

📺 You can watch this assertion explained in the video The Possess Assertion From cypress-map Plugin

$3

Confirms the items in the current subject array are unique (using a Set to check)

`js
cy.wrap([1, 2, 3]).should('be.unique')
cy.wrap([1, 2, 2]).should('not.be.unique')
`

$3

Compares trees of HTML elements allowing for partial matches.

`js
cy.get('selector').should(
'look',


`js
cy.get('#items')
.should('look', '

• second

`js
// the DIV might have lots of other classes, but we are interested in the class "error" only
cy.get('#field').should('look', '

Here are a few examples to clarify the different between the cy.invoke, cy.map, and cy.mapInvoke query commands, see diff.cy.js

`js
const list = ['apples', 'plums', 'bananas']

// cy.invoke
cy.wrap(list)
// calls ".sort()" on the list
.invoke('sort')
.should('deep.equal', ['apples', 'bananas', 'plums'])

// cy.mapInvoke
cy.wrap(list)
// calls ".toUpperCase()" on every string in the list
.mapInvoke('toUpperCase')
.should('deep.equal', ['APPLES', 'PLUMS', 'BANANAS'])

// cy.map
const reverse = (s) => s.split('').reverse().join('')
cy.wrap(list)
// reverses each string in the list
.map(reverse)
.should('deep.equal', ['selppa', 'smulp', 'sananab'])
// grabs the "length" property from each string
.map('length')
.should('deep.equal', [6, 5, 7])
`

Misc

$3

I have added another useful command (not a query!) to this package. It allows you to process items in the array subject one by one via synchronous, asynchronous, or cy command functions. This is because the common solution to fetch items using cy.each, for example does not work:

`js
// fetch the users from a list of ids
// 🚨 DOES NOT WORK
cy.get(ids).each(id => cy.request('/users/' + id)).then(users => ...)
// Nope, the yielded "users" result is ... still the "ids" subject
// ✅ CORRECT SOLUTION
cy.get(ids).mapChain(id => cy.request('/users/' + id)).then(users => ...)
`

One example could be checking new usernames by entering each string, then getting back the message text.

`ts
const usernames = ['u1', 'very-long-username-12345', 'admin']
cy.wrap(usernames, { log: false })
// check each username and yield the error message text
.mapChain((username: string) => {
cy.get('input#username').clear().type(username)
return cy.get('#result').should('be.visible').invoke('text')
})
.should('deep.equal', [
'Username is too short',
'Username is too long',
'Username is reserved',
])
`

cy.mapChain also can operate on each element

`ts
cy.get('button')
.should('have.length.above', 3)
.mapChain((btn: HTMLButtonElement) => {
cy.wrap(btn, { log: false }).click()
cy.get('#result')
.should('be.visible')
.invoke('text')
.apply(Number)
.should('be.within', 0, 10)
})
// we get all the yielded numbers in a single array
.should('be.an', 'array')
`

cy.mapChain passes the item and the 0-based index to the callback

`js
.mapChain((item, k) => ...)
`

You can use a predicate function to stop iteration early

`js
cy.wrap([1, 2, 3, 4, 5])
.mapChain(
(x) => x * 2,
// the predicate function with its arguments object
// item: the current item
// index: the zero-based item index
// result: the value yielded by the chain function
({ item, index, result }) => result >= 6,
)
.should('deep.equal', [2, 4, 6]) // stops after producing 6
`

See 📺 cy.mapChain Custom Command Examples.

$3

This is a command that runs for N milliseconds (the default command timeout, or custom) and checks if the given selector is NOT found on the page. Useful to confirm that an error widget does not flash unexpectedly on the page, for example.

`js
// check for default period of time
// and if an element with class "error" is found, fail immediately
cy.never('.error')
// specify custom timeout for checking
cy.never('.error', { timeout: 2_000 })
// stop checking once there is the finished message
cy.never('.error', { stopSelector: '#message:contains("Finished")' })
`

You can use jQuery selectors.

Types

This package includes TypeScript command definitions for its custom commands in the file commands/index.d.ts. To use it from your JavaScript specs:

`js
///
`

If you are using TypeScript, include this module in your types list

`json
{
"compilerOptions": {
"types": ["cypress", "cypress-map"]
}
}
`

The build process

The source code is in the src/commands folder. The build command produces ES5 code that goes into the commands folder (should not be checked into the source code control). The package.json in its NPM distribution includes commands plus the types from src/commands/index.d.ts file.

See also

- cypress-should-really has similar functional helpers for constructing the should(callback) function on the fly.

Note: this module does not have filter` method because Cypress API has query commands cy.filter and cy.invoke that you can use to filter elements in a jQuery object or items in an array. See the examples in the filter.cy.js spec. 📺 See video Filter Elements And Items With Retries.

Small print

Author: Gleb Bahmutov <gleb.bahmutov@gmail.com> © 2022

- @bahmutov
- glebbahmutov.com
- blog
- videos
- presentations
- cypress.tips
- Cypress Tips & Tricks Newsletter
- my Cypress courses

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

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