Importance of the Levels Of Testing…
Before releases an application, it undergoes a thorough testing process to ensure that the application is working in the manner in which it was intended.  that need to be completed before releasing the application. To enhance the quality of software testing, The testing process could be abstracted to different levels. There are Five main levels of testing.

1)Unit Testing
2)Module/Component Testing
3)Integration Testing
4)System Testing
5)User Acceptance Testing

1)Unit Testing:
Basically Unit Testing comes under the part of White box testing and it is done by developers.
Unit testing is a method by which individual units of source code together with associated control data are tested to ensure that code meets its design and behaves as intended.

Definition::Unit::A unit is nothing but smallest testable part/program in the source code of an application such as functions/procedures, classes, interfaces etc.

If all these things are working according to the design execution that is called unit testing.One of the biggest benefits of this testing phase is that it can be run every time a piece of code is changed, allowing issues to be resolved as quickly as possible. It’s quite common for software developers to perform unit tests before delivering software to testers for formal testing.

2)Module/Component Testing:
Module testing is also known as component and program testing.
In this level of testing, individual software modules are tested to find defects in the module and verifies the functioning of software Module.It may be done in isolation from rest of the system depending on the development life cycle model chosen for that particular application.

3)Integration Testing:
In this level of testing, individual software modules are combined and tested as a group to make verify integrated system is ready for system testing.It is also come under the White box testing and it is done by tester. But in most of the cases Integration test is done by testing team.

Definition::Integration Testing:: Establishing connection between the Modules and conduct checking
among the relation.

Integration testing allows individuals the opportunity to combine all of the Modules within a program and test them as a group. This testing level is designed to find interface defects between the modules/functions. This is particularly beneficial because it determines how efficiently the Modules are running together. Keep in mind that no matter how efficiently each Module is running, if they aren’t properly integrated, it will affect the functionality of the software program.

In this Integration Testing, we have some approaches to test the application
A)Big Bang Approach :
B)Incremental Approach: which is further divided into following
Top Down Approach
Bottom Up Approach
Sandwich Approach – Combination of Top Down and Bottom Up

4)System Testing:
System testing is conducted on a complete, integrated system to evaluate the system’s compliance with its specified requirements. System testing falls within the scope of black box testing, and as such, should require no knowledge of the inner design of the code or logic.

System testing is most often the final test to verify that the system to be delivered meets the specification and its purpose. It should investigate both functional and non-functional requirements of the testing.

The goal at this level is to evaluate whether the system has complied with all of the outlined requirements and to see that it meets Quality Standards. System testing is undertaken by independent testers who haven’t played a role in developing the program. This testing is performed in an environment that closely mirrors production. System Testing is very important because it verifies that the application meets the technical, functional, and business requirements that were set by the customer.

5)User Acceptance Testing:
The final level, Acceptance testing (or User Acceptance Testing), is conducted to determine whether the system is ready for release. During the Software development life cycle, requirements changes can sometimes be misinterpreted in a fashion that does not meet the intended needs of the users. During this final phase, the user will test the system to find out whether the application meets their business’ needs. Once this process has been completed and the software has passed, the program will then be delivered to production.

Acceptance Testing is a level of the software testing process where a system is tested for acceptability. The purpose of this test is to evaluate the system’s compliance with the business requirements and assess whether it is acceptable for delivery.Acceptance testing is basically done by the user or customer although other stakeholders may be involved as well.


Levels of testing

As you can see, the extensiveness of these tests is just another reason why bringing your software testers in early is important. When a program is more thoroughly tested, a greater number of bugs will be detected; this ultimately results in higher quality software.

Testing early and testing frequently is well worth the effort.By adopting an attitude of constant alertness and scrutiny in all your projects, as well as a systematic approach to testing, the tester can pinpoint any faults in the system sooner, which translates in less time and money wasted later on.

Detecting software errors early is important since it more effort is needed to fix bugs when the system is nearing launch, and — due to the interactive nature of components in the system — one small bug in a particular component hidden deep within layers of code can result in an effect that is magnified several times over on a system-level.

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