BDD and TDD in Cypress (step by step) with code examples

BDD (Behavior-Driven Development) and TDD (Test-Driven Development) are two different approaches to testing software applications. Here is a step-by-step guide to implement each of them using Cypress, with code examples:

BDD with Cypress:

1. Write user stories to describe the behavior you want to test:

   As a user,
   I want to be able to login to my account,
   So that I can access my personal information.
   

    

2. Translate user stories into scenario tests using Gherkin syntax:

   Feature: Login functionality
     Scenario: User can login to their account
       Given the user is on the login page
       When the user enters their username and password
       And clicks the login button
       Then the user should be redirected to their account page
   

    

3. Implement step definitions using Cypress API and JavaScript:

   import { Given, When, Then } from 'cypress-cucumber-preprocessor/steps';
   
   Given('the user is on the login page', () => {
     cy.visit('/login');
   });
   
   When('the user enters their username and password', () => {
     cy.get('input[name="username"]').type('user123');
     cy.get('input[name="password"]').type('password123');
   });
   
   And('clicks the login button', () => {
     cy.get('button[type="submit"]').click();
   });
   
   Then('the user should be redirected to their account page', () => {
     cy.url().should('include', '/account');
   });
   

    

4. Run the tests and verify that they pass or fail as expected:

   $ npx cypress run
   

    

5. Repeat steps 2-4 until all scenarios are covered.

TDD with Cypress:

1. Write a test for a new feature or behavior:

   describe('Login functionality', () => {
     it('allows user to login to their account', () => {
       cy.visit('/login');
       cy.get('input[name="username"]').type('user123');
       cy.get('input[name="password"]').type('password123');
       cy.get('button[type="submit"]').click();
       cy.url().should('include', '/account');
     });
   });
   

    

2. Run the test and verify that it fails:

   $ npx cypress run
   

    

3. Implement the feature or behavior:

   // implementation of the login feature
   

    

4. Run the test and verify that it passes:

   $ npx cypress run
   

    

5. Repeat steps 1-4 for each new feature or behavior.

Note: The code examples are meant to provide a general idea of how BDD and TDD can be implemented in Cypress. Your actual implementation may vary based on your specific requirements and environment.

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Author : Ghulam Nabi