[SE] Software Testing

Program Testing

Testing is intended to show that a program does what it is intended to do and to discover program defects before it is put into use.

When you test software, you execute a program using artificial data.

You check the results of the test run for errors, anomalies or information about the program's non-functional attributes.

Testing is part of a more general verification and validation process, which also includes static validation techniques.

Program testing goals

1. To demonstrate to the developer and the customer that the software meets its requirements.
   • For custom software, this means that there should be at least one test for every requirement in the requirements document.
   • For generic software products, it means that there should be tests for all of the system features, plus combinations of these features, that will be icorporated in the product release.
2. To discover situations in which the behavior of the software is incorrect, undesirable or does not conform to its specification.
   • Validation Testing
     To demonstrate to the

Development Testing

Development testing includes all testing activities that are carried out by the team developing the system.

Testing activities can be categorized based on the level of components being tested.

• Unit testing
• Component testing
• System testing

Unit testing

Unit testing is the process of testing individual components in isolation.
It is a defect testing process.

System Testing

System testing during development involves integrating components to create a version of the system and then testing the integrated system.

The focus in system testing is testing the interactions between components.

System testing checks that components are compatible, interact correctly and transfer the right data at the right time across their interfaces.

System testing tests the emergent behaviour of a system.