3.5 Application of testing to a range of contexts GapFill

Testing data is an essential part of software development. It makes sure that the  initialfinaltype oftechnical product is useful and error-free. If any errors remain in the software, it could impact the functionality of the end product.

There are three types of test data: extreme,   largeinvalidclosedopen and valid. Extreme data is the value on the   valueboundaryendcomplexity of the data set, e.g. a value that is 20, in a dataset with a range of 10−20. Invalid data represents any values that are out of   datetopicorderrange or incomplete, and thus unacceptable, e.g. a password with no capital letter. Valid data is an acceptable and sensible value   out ofatwithinabove the range and type, e.g. values for a date field in the format dd/mm/yyyy.

There are two types of testing: technical and user testing. Both types need a test plan which should have enough detail for a person to carry out the planned tests.

 UserValidationTechnicalError testing checks whether the functionality of the solution is complete, along with the range of  networkssolutionsdevicesapplications it works on, e.g. calculations used on a spreadsheet.

 ValidationTechnicalUserError testing comprises multiple users using a solution. It can be carried out in the early stage of a creation or when the product is ready to be released, also known as  extremealphabetaerror testing, e.g. HCI functionality.