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how-to-create-a-cypress-plugin

This plugin serves as an example of how to create a Cypress npm plugin. It features two custom commands: one for comparing aliases and another for styled logging within the Cypress runner log.

You can read the full post on how to create a Cypress npm plugin in my blog entry titled "The Quirky Guide to Crafting and Publishing Your Cypress npm Plugin".

Installation

Install the plugin by running:

npm install how-to-create-a-cypress-plugin --save-dev

Compatibility

This plugin is compatible with Cypress version 12.0.0 and above.

Configuration

No additional configuration is needed to use these commands beyond the standard Cypress setup.

API Reference

The plugin provides the following commands:

  • compareAliases(chainer, alias1, alias2): Compares two aliases using the specified chainer.
  • colorLog(message, hexColor, options): Logs a message in the Cypress runner with the specified color and options.

Usage

Before utilizing the custom commands, import them at the beginning of your Cypress test files.

To load only the assertions commands:

import 'how-to-create-a-cypress-plugin/src/assertions';

To load only the custom log commands:

import 'how-to-create-a-cypress-plugin/src/custom-log';

To load both sets of commands:

import 'how-to-create-a-cypress-plugin';

Remember to use the correct import statement depending on which commands you need for your tests.

Assertions

Use cy.compareAliases() to assert the equality of two aliases:

// Define aliases
cy.get('@aliasOne').as('firstAlias');
cy.get('@aliasTwo').as('secondAlias');

// Compare the aliases
cy.compareAliases('deep.equal', '@firstAlias', '@secondAlias');

Custom Log

Use cy.colorLog() to output styled messages in the Cypress runner:

// Log a message with color
cy.colorLog('Message content', '#FF0000', {
    displayName: "Error",
    data: { detail: 'Error details' }
});

License

This plugin is licensed under the MIT License. See LICENSE for full license text.

Changelog

1.0.1 Fix documentation typos

1.0.0 Initial release