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TDD vs BDD Example: How Do They Differ in Real Projects?
Understanding theory is helpful, but a clear tdd vs bdd example makes the difference easier to grasp. Both approaches encourage early testing, yet they operate at different levels and serve different purposes within a project.
Consider a simple feature: <strong data-start=”321″ data-end=”353″>Password reset functionality.
In a TDD approach, a developer would:
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Write a unit test to verify that a valid email triggers a reset token generation.
Run the test and watch it fail.
Implement the minimal logic to make the test pass.
Refactor the code while keeping the test green.
Additional unit tests would check invalid emails, expired tokens, and edge cases. The focus remains on code correctness and structure at a granular level.
In a BDD approach, the same feature would be described behaviorally:
Scenario: Successful password reset request
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Given a registered user
When the user submits a valid email address
Then a reset link should be sent
Scenario: Unregistered email
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Given the email is not in the system
When the user submits the request
Then an appropriate error message should appear
This shows how a tdd vs bdd example highlights scope differences. TDD strengthens internal code quality, while BDD ensures the feature behaves correctly from a user and business standpoint. Many teams blend both to achieve technical precision and shared clarity.
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