Functional Testing is a type of Software Testing in which the system is tested against the functional requirements and specifications.
Functional testing is a type of testing that seeks to establish whether each application feature works as per the software requirements. Each function is compared to the corresponding requirement to ascertain whether its output is consistent with the end user’s expectations. The testing is done by providing sample inputs, capturing resulting outputs, and verifying that actual outputs are the same as expected outputs. Some functional testing examples are:
- Can users successfully log in to the application once they provide legitimate credentials?
- Does the payment gateway reject the input and display an error message when a user keys in an invalid credit card number?
- Do inputs to the “Add New Record” screen successfully add and save a new record to the database?Typical steps of Functional TestingA functional testing plan usually follows the below sequence:Identify the testing goalsFunctional testing goals are the features the software is expected to have based on the project requirements. Testing goals include validating that the application works as it was intended to, and that it handles errors and unexpected scenarios gracefully.Create test scenariosDevelop a list of all possible (or at least all the most important) test scenarios for a given feature. Test scenarios describe the different ways the feature will be used. For instance, for a payment module, the test scenarios may include multiple currencies, handling invalid or expired card numbers, and generating a notification on successful transaction completion.
