How to use Cypress route with query strings

In end-to-end testing with Cypress, properly handling routing and query strings is crucial. By doing this, we can ensure that the application functions correctly across various navigation scenarios. Here are several steps and examples on how to use routing and query strings in Cypress:

Step 1: Intercept Network Requests

Cypress allows you to use the cy.intercept() method to intercept network requests. This is useful for controlling and testing routes with query strings.

javascript
// Intercept specific requests before the test starts
cy.intercept('GET', '/api/data?param=value').as('getData');

Step 2: Trigger Routes with Query Strings

You can trigger routes with query strings using the cy.visit() or cy.request() methods.

javascript
// Use cy.visit() to access a page with a query string
cy.visit('/products?type=electronics');

// Or use cy.request() to send a request with a query string
cy.request('/api/data?param=value');

Step 3: Verify Intercepted Requests

Once the route is triggered, you can use the alias set earlier to verify the intercepted request and confirm that the expected query parameters were sent.

javascript
// Confirm that the request was sent correctly with the expected query parameters
cy.wait('@getData').its('request.url').should('include', 'param=value');

Step 4: Assert Responses and Behavior

After triggering the route with query parameters, you can assert that the page behavior and response data meet expectations.

javascript
// Assert response data
cy.wait('@getData').its('response.statusCode').should('eq', 200);
cy.wait('@getData').its('response.body').should('have.property', 'data');

// Assert page elements
cy.get('.product').should('have.length', 10);

Example Scenario

Suppose we have an e-commerce website, and we want to test the product search functionality where users filter products using a query string.

javascript
describe('Product Search Functionality', () => {
  it('should filter products based on the query string', () => {
    // Intercept the API request for product search
cy.intercept('GET', '/api/products?category=electronics').as('fetchElectronics');
    // Visit the product page with a query string
cy.visit('/products?category=electronics');
    // Confirm that the API request sent the correct query parameters
cy.wait('@fetchElectronics').its('request.url').should('include', 'category=electronics');
    // Confirm that the page correctly renders electronic products
cy.get('.product').should('have.length', 5);
  });
});

By doing this, we can ensure that the application correctly responds to different query parameters and can be tested automatically using Cypress's powerful features.