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Online ordering and inventory system

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par Jean Claude KANYESHYAMBA
INILAK - Bachelor's degree 2012
  

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5.4 Software testing

5.4.1Introduction

The testing phase is the stage that follows the implementation of the program with the aim to verify whether it responds to the existing problem or it does what it has to do.

It also involves the examination of the functionality of program in general to ensure that the software responds to the needs of the users.

This will verify the performance of the program in matters of security and portability. The bottom line is that the software should be delivered, not only working correctly but also satisfying other attributes such as usability and maintainability. The following test methods were used to try to uncover all possible errors and verify that the system fully satisfies its requirements. It is worth mentioning that we have tried to follow the best practices suggested by all software engineering researchers.

5.4.2 Unit testing

We used this method of testing in purpose of taking smallest piece of testable in our application, isolate it from the remainder of the code and determine whether it behaves exactly as we expect.

Each unit is tested separately before integrating them into modules to test the interfaces between modules.

5.4.3 Integration testing

Integration testing is a logical extension of unit testing. In its simplest form, two units that have already been tested are combined into a component and the interface between them is tested. A component, in this sense, refers to an integrated aggregate of more than one unit. In a realistic scenario, many units are combined into components, which are in turn aggregated into even larger parts of the program. The idea is to test combinations of pieces and eventually expand the process to test your modules with those of the groups.

Eventually all the modules making up a process are tested together. Beyond that, if the program is composed of more than one process, they should be tested in pairs rather than all at once.

5.4.4 Validation testing

Test validation is a procedure that demonstrates that a test is job-related and correlates to on the job-performance. There are three main types of validation:

Content validation is a procedure where the content of the job in question is analyzed, matched and compared, (function by function) to the abilities measured by the test. This shows that the test is related to the job.

Concurrent validation is a procedure which tests individuals currently in the position, and the statistically compares the test results, after a certain time, to on-the job performance.

Predictive validation is a procedure which tests individuals when they are hired, and then statistically compares the test results, after a certain time, to on-the job performance.

5.4.5 Black Box testing

Black testing takes an external perspective of the test object to derive test cases. These tests can be functional or non-functional, through usually functional. The test designer selects valid and invalid inputs and determines the correct output. There is no knowledge of the test object's internal structure.

This method of test design is applicable to all levels of software testing: unit, integration, functional testing, system and acceptance. The higher the level, and hence the bigger and more complex the box, the more one is forced to use black box testing to simplify. While this method can uncover unimplemented parts of the specification, one cannot be sure that all existent paths are tested.

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