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cypress-mailosaur

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cypress-mailosaur

Extends Cypress' cy commands that let you integrate email and SMS testing into your continuous integration process.

  • 2.16.0
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Mailosaur Cypress Commands

Test email and SMS messages with Cypress

Using Cypress and Mailosaur together you can:

  • Test email, with unlimited test email addresses
  • Test SMS messages
  • Capture emails with your very own fake SMTP servers

What is Mailosaur?

Mailosaur is a service that lets you automate email testing (e.g. email verification, password resets, etc.) and SMS testing (e.g. one-time passwords).

Mailosaur also provides dummy SMTP servers to test with; allowing you to catch email in staging environments - preventing email being sent to customers by mistake.

How do I test email with Cypress?

Follow these steps to start testing email with Cypress:

Step 1 - Installation

Install the Mailosaur commands via npm or yarn:

npm i -D cypress-mailosaur
# or
yarn add -D cypress-mailosaur

Once downloaded, add the following line to cypress/support/e2e.js (or cypress/support/index.js in older versions of Cypress) to import the commands into your Cypress project:

require('cypress-mailosaur');

Step 2 - API Authentication

Mailosaur commands need your Mailosaur API key to work. You can learn about managing API keys here.

Add API key to cypress.config.js
module.exports = defineConfig({
  env: {
    MAILOSAUR_API_KEY: "your-key-here",
  },

  // ...
});

Alternatively, set API key via a system environment variable

To set the environment variable on your machine, it needs to be prefixed with either CYPRESS_ or cypress_.

export CYPRESS_MAILOSAUR_API_KEY=your-key-here

Step 3 - Write your email test

For this example, we'll navigate to a password reset page, request a new password link (sent via email), and get that email.

Create a new test spec:

touch cypress/e2e/password-reset.cy.js

Now edit the file to something like this:

describe('Password reset', () => {
    const serverId = 'abcd1234'
    const serverDomain = 'abcd1234.mailosaur.net'
    const emailAddress = 'password-reset@' + serverDomain

    it('Makes a Password Reset request', () => {
        cy.visit('https://github.com/password_reset')
        cy.title().should('equal', 'Forgot your password?')
        cy.get('#email_field').type(emailAddress)
    })

    it('Gets Password Reset email from Mailosaur', () => {
        cy.mailosaurGetMessage(serverId, {
            sentTo: emailAddress
        }).then(email => {
            expect(email.subject).to.equal('Reset your password');
            passwordResetLink = email.text.links[0].href;
        })
    })

    it('Follows the link from the email', () => {
        const validPassword = 'delighted cheese jolly cloud'

        cy.visit(passwordResetLink)
        cy.title().should('contain', 'Change your password')
        cy.get('#password').type(validPassword)
        cy.get('#password_confirmation').type(validPassword)
        cy.get('form').submit()
    })
})

Step 4 - Write further test cases

You can test pretty much anything with Mailosaur and Cypress, including:

For more information, check out the full Mailosaur docs for the most up-to-date guides and troubleshooting tips.

How do I test SMS with Cypress?

Mailosaur Team, Premium, and Ultimate customers can perform SMS tests with Cypress, whilst Trial account users can just ask support to enable this feature to try it out!

SMS testing works in just the same way as email testing above. However rather than dealing with email addresses, you search using phone numbers instead. For example:

cy.mailosaurGetMessage(serverId, {
    sentTo: '447555111222'
}).then(sms => {
    expect(sms.text.body).to.equal('Your OTP code is: 123456')
})

Development

Install all development dependencies:

cd test/react-app
npm i
cd ../../
npm i

The test suite requires the following environment variables to be set:

export CYPRESS_MAILOSAUR_API_KEY=your_api_key
export CYPRESS_MAILOSAUR_SERVER=server_id

Run all tests:

npm test

Contacting us

You can get us at support@mailosaur.com

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Package last updated on 30 Sep 2024

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