Different Levels Or Types of Testing Software: In the Agile software development process, the Developer and testers are work together in an intentioned to deliver a quality product to the customer. Here a Developer developed a product based on the requirement of the customer. Still, the testers are playing an important role because when you plan for a quality product to the consumer, then that application or software should go through the various testing process.
When the application reaches to testers for testing, that time, testers need to test the application with various levels of testing for releasing a quality product. As per the purposes, there are different levels of testing, and in each level of testing, we are conducting a different type of testing.
Levels or Types of Testing Software
Software testing is a process where every unit of the application or software tested. The main goal of those testing is to evaluate what we are meeting the specified needs or not.
Out of those levels or Types of Testing, some of the standards help us to check the behavior and performance of the application. Those levels or Types of Testing are designed to find the missing gaps. There are mainly four testing levels or Types of Testing are there, that are:
Each of these testing levels or Types of Testing has a specific purpose, and each level has added value to the software development life cycle (SDLC Models). Let us see and try to understand each level one by one.
This is the first round of testing where when the application reached to testers. They concentrate on specific units of the application and try to determine whether each unit is fully functional or not. So the main goal is here is to find out that the application functions as designed or not.
During this phase, a unit can refer to a function, individual program, or even a procedure, and special a white-box testing method is used to get the job done. The main benefit of this testing is that this testing is run whenever a small piece of code also changed so that you can easily find out the issues and can be resolved as soon as possible — Thats why this testing is also called as Module Testing or Component Testing.
So in the organization, the Unit testing is always is created by the Developers to perform the unit testing before delivering the application to the software testers. If you want to read more details, then you can read our details article about Unit Testing by following the link.
In this type of testing, all the units are group together and test them as a group. This testing is designed to find the interface defects of the application when we interconnect between different modules or functions.
Because of this type of testing, we can find out how efficiently the units are running together. Keep in mind that no matter how efficiently each unit is running, if they aren’t properly integrated, it will affect the functionality of the software program.
So this type of testing is again subdivided into
- Top-Down Approach
- Bottom-Up Approach
- Sandwich Approach
When we are testing with the approaches, we are taking the help of some of the dummy programs called Stubs and Drivers. These Stub and Driver do not have the complete logic in them; they are developed in such a way that they can pass the data to the called module.
Top-Down Integration Testing
In this approach, the higher modules are integrated and tested firsts, and later, the lower sub-modules are integrated and tested. If the submodules are not creating for integration, then at that time, we are taking the help of stubs, which as used as a temporary module to complete the integration testing.
Bottom-Up Integration Testing
This testing, the integration process started by integrating the lower sub-modules and tested first. Later on, the main modules are trying to integrate. During the integration, If the main module is not available for integrating, then that time, we are taking the help of the driver, which is a temporary module for passing the data between the modules.
Big Bang Integration Testing
In Big Bang Integration Testing, all modules are not integrated like in the top-down approach or bottom approach. Here the integration of different modules will be started only when all modules are available for integration. After all the modules are developed, the integration process is started and tested to verify that all the units are working properly or not.
The main disadvantage of this approach is that the defects are found at the later stage, then that time, it is very much difficult to find out whether the defect comes because of the integration or in some specific unit.
This is the first stage of testing, where we are started the whole application testing. That why this testing also called End to End Testing. During the testing process, we try to verify that the application meets all the requirements or not, and we also see that the application is meeting the quality standards.
This testing is carried out by some individual testers who haven’t played a role in developing the program. In most of the organization, this type of testing is carried out in a production-like environment. System Testing is very important because it verifies that the application meets the technical, functional, and business requirements that were set by the customer.
The testing process is the final Level of testing, and this testing is carried out to confirm whether the system is ready to ready for the 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.
There are different types of Acceptance testing is there, that are alpha testing and Beta Testing.
This testing is carried out by the same organization developer and testers. But some times the client also participates in alpha testing or some third party peoples are also test the application.
This type of testing is carried by some of the limited numbers of the users by releasing a beta version of the application. If the end-users are reported any feedback or defect, then that will be fixed before the release.
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.