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Testing goes through a series of standard phases, as follows:

• Unit tests are performed to test and validate small portions of the software, independently. They are run by the developer, or automatically after each commit or daily.
• Integration tests are performed to verify the interaction between components and expose defects in the interfaces. They are performed by developers or testers.
• System tests are performed to test the system end-to-end and verify the compliance with the requirements. There are different types of system tests: regression tests, performance tests, stress tests, security tests etc.
• Acceptance tests ensure that the system works in the user environment. There are two sub-phases:
  • Alpha tests are run by the customer at the developer's site.
  • Beta tests are run by the customer at the customer's site.

In addition to the previous ones, smoke tests can be performed to verify that the most crucial functionalities are working. It is usually performed by the tester before the other tests, or in a daily build. Can either be run before integration or system tests.