How to go to custom command implementation in cypress

What are Custom Commands?

In Cypress, custom commands enable you to encapsulate repetitive test logic, making your test code more concise, readable, and maintainable. You can wrap commonly used code snippets into commands and call them multiple times in your tests.

How to Implement Custom Commands?

To implement custom commands in Cypress, you typically need to define them in the cypress/support/commands.js file using the Cypress.Commands.add() method. This adds the command to the global command set, making it available in all test files.

Example Implementation

Suppose you frequently need to test the user login functionality; you can create a custom command to encapsulate the login logic. Here are the steps and code example for implementing this custom command:

1. Open the cypress/support/commands.js file:

   • This is the standard location for all custom commands.

2. Use Cypress.Commands.add to add a custom command:

   • The first parameter is the command name (e.g., login), and the second parameter is the function to execute when the command is called.

3. Implement the login logic in the command function:

   • You can use cy.get(), cy.type(), cy.click() and other Cypress commands to simulate user input and interaction.

javascript
Cypress.Commands.add('login', (email, password) => {
  cy.visit('/login');  // Visit the login page
  cy.get('input[name="email"]').type(email);  // Enter email
  cy.get('input[name="password"]').type(password);  // Enter password
  cy.get('form').submit();  // Submit the login form
});

How to Call Custom Commands?

In any test file, whenever you need to perform a login operation, you can simply call this custom command:

javascript
describe('User Dashboard', () => {
  it('should display user dashboard after login', () => {
    cy.login('user@example.com', 'password123');  // Use the custom command to log in
    cy.contains('Welcome, User!');  // Verify successful login and welcome message
  });
});

Summary

By doing this, we not only make the test code more concise and focused, but also increase its reusability and maintainability. Whenever the login process changes, you only need to update the logic in the custom command, without modifying the code in each test case. This greatly simplifies test maintenance.