Lodash Cypress

Lodash is a widely used JavaScript utility library with a vast number of useful functions. Cypress is an end-to-end testing framework for web applications. Lodash and Cypress can be used together to make writing tests easier and more efficient. In this article, we will explore some of the features of Lodash Cypress and how they can improve your testing.

Installation

To use Lodash Cypress, you need to install both Lodash and Cypress. You can install them using the following commands:

npm install lodash
npm install cypress

Once installed, you can include Lodash in your Cypress test files using:

import _ from 'lodash';

Functions

_.get()

The _.get() function allows you to access nested properties of an object. This can be useful when testing complex objects or API responses. For example:

const user = {
  id: 1,
  name: "John",
  address: {
    street: "123 Main St.",
    city: "Anytown, USA"
  }
}

cy.wrap(user).should('have.property', 'id', 1);
cy.wrap(user).should('have.property', 'name', 'John');
cy.wrap(user).should('have.property', 'address').and(address => {
  expect(_.get(address, 'street')).to.equal('123 Main St.');
  expect(_.get(address, 'city')).to.equal('Anytown, USA');
});

_.pick()

The _.pick() function allows you to pick specific properties from an object. This can be useful when testing API responses where you only care about certain properties. For example:

const user = {
  id: 1,
  name: "John",
  email: "john@example.com",
  phone: "555-1212"
}

cy.wrap(user).should('have.property', 'id', 1);
cy.wrap(user).should('have.property', 'name', 'John');
cy.wrap(user).should('not.have.property', 'email');
cy.wrap(user).should('not.have.property', 'phone');

const userWithoutSensitiveData = _.pick(user, ['id', 'name']);
cy.wrap(userWithoutSensitiveData).should('deep.equal', { id: 1, name: 'John' });

_.isEqual()

The _.isEqual() function allows you to compare two objects for equality. This can be useful when testing object transformations. For example:

const transform = (obj) => {
  return {
    id: obj.id,
    name: obj.first_name + ' ' + obj.last_name
  };
}

const user = {
  id: 1,
  first_name: 'John',
  last_name: 'Doe'
}
const expectedUser = {
  id: 1,
  name: 'John Doe'
}

const transformedUser = transform(user);
cy.wrap(transformedUser).should('deep.equal', expectedUser);
cy.wrap(_.isEqual(transformedUser, expectedUser)).should('be.true');

Conclusion

Lodash Cypress provides a powerful set of tools for testing JavaScript applications. The _.get(), _.pick(), and _.isEqual() functions are just a few examples of how Lodash Cypress can simplify your tests and make them more efficient. By combining the power of Lodash with the ease of use of Cypress, you can take your testing to the next level.