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Very Basics Of Testing


Software testing is a critical element of software quality assurance and represents the ultimate review of specification, design and coding. Testing is the exposure of the system to trial input to see whether it produces correct output.

Testing Phases:

Software testing phases include the following:

Test activities are determined and test data selected.

The test is conducted and test results are compared with the expected results.

There are various types of Testing:

Unit Testing:

Unit testing is essentially for the verification of the code produced during the coding phase and the goal is test the internal logic of the module/program. In the Generic code project, the unit testing is done during coding phase of data entry forms whether the functions are working properly or not. In this phase all the drivers are tested they are rightly connected or not.

Integration Testing:

All the tested modules are combined into sub systems, which are then tested. The goal is to see if the modules are properly integrated, and the emphasis being on the testing interfaces between the modules. In the generic code integration testing is done mainly on table creation module and insertion module.

System Testing:

It is mainly used if the software meets its requirements. The reference document for this process is the requirement document. Acceptance Testing:

It is performed with realistic data of the client to demonstrate that the software is working satisfactorily. In the Generic code project testing is done to check whether the Creation of tables and respected data entry was working successfully or not.

Testing Methods:

Testing is a process of executing a program to find out errors. If testing is conducted successfully, it will uncover all the errors in the software. Any testing can be done basing on two ways:

White Box Testing:

It is a test case design method that uses the control structures of the procedural design to derive test cases. using this testing a software Engineer can derive the following test cases:

Exercise all the logical decisions on either true or false sides. Execute all loops at their boundaries and within their operational boundaries. Exercise the internal data structures to assure their validity.

Black Box Testing:

It is a test case design method used on the functional requirements of the software. It will help a software engineer to derive sets of input conditions that will exercise all the functional requirements of the program. Black Box testing attempts to find errors in the following categories:

Incorrect or missing functions

Interface errors

Errors in data structures

Performance errors

Initialization and termination errors

By black box testing we derive a set of test cases that satisfy the following criteria:

Test cases that reduce by a count that is greater than one, the number of additional test cases that must be designed to achieve reasonable testing.

Test cases that tell us something about the presence or absence of classes of errors rather than errors associated only with a specific test at hand.

Testing can be done in two ways:

Bottom up approach

Top down approach

Bottom up approach:

Testing can be performed starting from smallest and lowest level modules and proceeding one at a time. For each module in bottom up testing a short program executes the module and provides the needed data so that the module is asked to perform the way it will when embedded with in the larger system. When bottom level modules are tested attention turns to those on the next level that use the lower level ones they are tested individually and then linked with the previously examined lower level modules.

Top down approach:

This type of testing starts from upper level modules. Since the detailed activities usually performed in the lower level routines are not provided stubs are written. A stub is a module shell called by upper level module and that when reached properly will return a message to the calling module indicating that proper interaction occurred. No attempt is made to verify the correctness of the lower level module.

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