What's "stages of software testing?

The system is tested in stages in accordance with the planned construction and release strategies, from individual units of code used by integrated subsystems releases and the final system. Testing proceeds by various physical levels of the application development cycle. Each completed level is a milestone to plan for the project and each stage is a known level of physical integration and quality. These phases are called the integration test level. Levels ofTesting include the following:

1. Unit Test - Checks the program specifically to the internal logic of the program or module and validate the logic.

2. Integration Test - Checks the correct execution of application components including interfaces. The communication between modules within the sub-system is tested in a controlled and isolated environment within the project. String test is part of the integration test level / phase.

3. String / Integration Testing - is both theDetection and correction of programming / code generation problems. After a series of components or units that operate exclusively or have been tested and communicate with each encoded as a unit, conduct an initial "string" test is performed. This "stringing" the integration of the components or equipment to run as a unit tends to a somewhat informal process of finding a communication or parameter passing problems that can not yet proven to be addressed. Since differentProgrammers may have to work on each component or module, or other analysts to separate action diagrams (for code generation), it is possible to have worked, that problems such as input / output formatting, switch / display setting, or expected state update may not be in all modules. The goal of the recognition of these coding errors before a formal system test is performed. Sufficient data must be created to ensure proper field formatting, to prove accurate parametercorrect over and triggering event occurs. A "sign-off" should only be the sum of connected and integrated assemblies and components shall be given to work as a smooth, seamless and error-free module.

4. System Test - Checks the proper execution of all application components including interfaces to other applications. Both functional and structural types of tests performed to verify that the system is functionally and operationally sound.

5. System Integration Test- Checks the integration of all applications, including interfaces to internal and external organization, with their hardware, software and infrastructure components in a production environment-like environment.

6. User Acceptance Test - Checks that the system meets user requirements as stated. It simulates the user experience and stresses security, documentation and regression tests.

7. Usability testing - verifies whether the application working in productionEnvironment. Usability tests will be performed after or simultaneously with user acceptance testing.

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