By employing the data-driven testing approach, we can use a single test to verify different sets of test cases or test data by driving the test with input and expected values from an external data source instead of using the hardcoded values every time a test is run. This becomes useful when we have similar tests that consist of the same steps but differ in the input data and expected value or the application state. Here is an example of a set of login test cases with different combinations:
| Description | Test data | Expected output |
| Test valid username and password | A pair of valid usernames and passwords | The user should log into the application with a success message |
| Test invalid username and password | An invalid username and password | The user should be displayed the login error |
| Valid username and invalid password | A valid username and an invalid... |