Data-Driven Testing | Bondar Academy

Lesson Summary

In this lesson, we explore the concept of data-driven testing , which allows you to run the same test multiple times with different data sets, enhancing efficiency and coverage. What is Data-Driven Testing? Data-driven testing involves executing the same test scenario repeatedly but with varying input data. This approach eliminates the need for repetitive test case creation by simply substituting different data for each run. When to Use Data-Driven Testing This method is particularly useful for testing edge cases . For example, in the Conduit application, we can test the sign-up functionality with various username lengths to validate error messages: 2 characters: "Username is too short. Minimum is 3 characters." 3 characters: No error message. 20 characters: No error message. 21 characters: "Username is too long. Maximum is 20 characters." Implementation Steps Create a new file data-driven.cy.js for the test scenario. Define test data as an array of objects, each containing properties like username , expected error message , and a flag for error display. Use a forEach loop to iterate through the test data and execute the test for each data set. Parameterize the test using the data from the current iteration. Example Test Data Structure const testData = [ { username: '12', errorMessage: 'Username is too short.', isDisplayed: true }, { username: '123', errorMessage: '', isDisplayed: false }, { username: '12345678901234567890', errorMessage: '', isDisplayed: false }, { username: '123456789012345678901', errorMessage: 'Username is too long.', isDisplayed: true } ]; Running the Tests After configuring the test, use the command npx cypress open to run the tests. Ensure that each test case is correctly titled by using template literals to include the username in the test name. In summary, data-driven testing is an efficient way to handle multiple test scenarios with varying data inputs, utilizing arrays of objects and iteration techniques to streamline the testing process.