How to go to custom commands implementation in Cypress?

Implementing custom commands in Cypress is an excellent way to improve the reusability and maintainability of test code. Custom commands allow us to encapsulate complex or repetitive operations into a single, reusable function. Next, I will explain how to create and use custom commands in Cypress through steps and examples.

Step 1: Define Custom Commands in the commands.js File

Cypress has a commands.js file in the cypress/support directory, which is where all custom commands are defined. Open this file and add new commands by calling the Cypress.Commands.add method. For example, if we want to create a custom command for logging in, we can do the following:

javascript
Cypress.Commands.add('login', (email, password) => {
  cy.get('input[name=email]').type(email);
  cy.get('input[name=password]').type(password);
  cy.get('form').submit();
});

Step 2: Use Custom Commands in Tests

Once the custom command is defined, it can be used in any test file just like built-in commands. For example, using the login command defined above:

javascript
describe('Login Test', () => {
  it('should login successfully', () => {
    cy.visit('/login');
    cy.login('user@example.com', 'password123');
    cy.url().should('include', '/dashboard');
  });
});

Example: Create a Custom Command to Delete a User

Suppose we frequently need to delete users across multiple test cases. We can create a custom command to handle user deletion:

javascript
Cypress.Commands.add('deleteUser', (username) => {
  cy.request({
    method: 'POST',
    url: '/api/delete-user',
    body: { username },
  });
});

Then, use this command in tests:

javascript
describe('User Deletion Test', () => {
  it('should delete user successfully', () => {
    cy.deleteUser('tempUser');
    // Add more assertions to confirm the result of the deletion
  });
});

Summary

By defining custom commands in commands.js and using them in tests, we can simplify test code, enhance readability and maintainability. This approach is particularly useful for test scenarios that require frequent repetition of the same operations.