How to mock chrome extension functions in Cypress?

To mock Chrome extension functions in Cypress, you can use Cypress custom commands and the cy.intercept() method to intercept and stub the calls made by the Chrome extension.

Here's a step-by-step guide on how to mock Chrome extension functions in Cypress:

1. Install Cypress: Make sure you have Cypress installed in your project. If not, you can install it using npm or yarn:

   bashCopy code
   npm install cypress --save-dev
   

2. Create a Custom Command: In your Cypress project, create a custom command to mock the Chrome extension function. Create a new file cypress/support/commands.js and define the custom command:

   javascriptCopy code
   // cypress/support/commands.js
   
   Cypress.Commands.add('mockChromeExtension', () => {
     // Stub the extension function using cy.intercept()
     // Replace 'extensionFunctionName' with the actual function name you want to mock
     cy.intercept('GET', 'https://your-extension-api-url.com', (req) => {
       req.reply({ fixture: 'mockedResponse.json' });
     }).as('mockedExtensionCall');
   });
   

3. Use the Custom Command in Your Test: In your Cypress test, use the custom command to mock the Chrome extension function before making the actual call:

   javascriptCopy code
   // cypress/integration/my_test_spec.js
   
   describe('My Test Suite', () => {
     it('should test something', () => {
       // Mock the extension function
       cy.mockChromeExtension();
   
       // Your test code that triggers the Chrome extension function
       // For example:
       cy.visit('https://your-app-url.com');
       cy.get('#myButton').click();
   
       // Assert that the extension function was called
       cy.wait('@mockedExtensionCall').then((interception) => {
         // Your assertions on the intercepted call response
         // For example:
         expect(interception.response.body).to.have.property('data');
       });
     });
   });
   

4. Use the Real Function in Production: To ensure that the actual Chrome extension function is called in the production environment, you can conditionally include the cy.mockChromeExtension() command based on an environment variable or other condition.

By using the cy.intercept() method and custom commands, you can effectively mock the Chrome extension functions in your Cypress tests, enabling you to test your application's behavior without relying on the actual Chrome extension behavior during testing.