Learn how to streamline your Cypress test suite by adding custom commands that enhance readability and maintainability. Whether you're automating login flows or validating UI elements, these custom commands make your tests more robust.
Enhance Your Cypress Tests with Custom Commands
Cypress is a robust framework for end-to-end testing of web applications, known for its simplicity and powerful capabilities. By adding custom commands with TypeScript, you can enhance your testing suite's readability and maintainability. This guide will walk you through the steps required to integrate custom commands into your Cypress setup.
Prerequisites
Before proceeding, ensure you have set up Cypress in your project. Hereβs a typical folder structure:
cypress
βββ downloads
βββ e2e
βββ fixtures
βββ support
βββ commands.ts
βββ index.d.ts
Step-by-Step Guide
Step 1: Install TypeScript
If you haven't already installed TypeScript, do so by running the following command:
npm install typescript --save-dev
Step 2: Configure TypeScript
Create a tsconfig.json
file at the root of your Cypress folder with the following configuration:
{
"compilerOptions": {
"target": "es5",
"lib": ["es5", "dom"],
"types": ["cypress", "node"]
},
"include": ["**/*.ts"]
}
This configuration ensures TypeScript compiles your code to ES5, includes necessary typings for Cypress and Node.js, and processes all .ts
files.
Step 3: Define Custom Commands
Navigate to /cypress/support/commands.ts
and define your custom commands. For example, let's create a command for user login:
// /cypress/support/commands.ts
Cypress.Commands.add('loginByUi', (email: string, password: string) => {
// Visit login page
cy.visit('http://localhost:3000/');
// Enter email and password
cy.get('input[id="email"]').type(email);
cy.get('input[id="password"]').type(password);
// Click submit button
cy.get('button[type="submit"]').click();
});
Step 4: Declare Custom Command Types
Create a declaration file index.d.ts
inside /cypress/support
to provide TypeScript with type definitions for your custom commands:
// /cypress/support/index.d.ts
declare namespace Cypress {
interface Chainable {
/**
* Custom command to login via UI.
* @example cy.loginByUi('email', 'password')
*/
loginByUi(email: string, password: string): void;
}
}
Step 5: Implement and Use Custom Commands
Once defined, you can use your custom command in Cypress test files (e.g., app.cy.ts
):
// /cypress/integration/app.cy.ts
describe('App component', () => {
it('Should navigate to app component', () => {
// Perform login using custom command
cy.loginByUi(email, password);
// Assert post-login elements
cy.get('img').should('be.visible'); // Check for image logo
cy.contains('p', 'Edit').should('be.visible'); // Check for 'Edit' text
cy.contains('a', 'Learn React').should('be.visible'); // Check for 'Learn React' link
});
});
Conclusion
By following these steps, you can efficiently extend Cypress with custom commands using TypeScript, making your tests more concise and maintainable. This approach enhances the clarity of your test scripts and promotes reusability across your testing scenarios. Start integrating custom commands today to optimize your Cypress testing workflow and ensure robust application testing. Happy testing! π
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