In the world of software testing, software testers go through various levels of testing. From unit testing to acceptance, the team has to ensure that all components of the product are tested thoroughly, without any hindrance. Performed after integration testing and before acceptance tests, System testing is one of these levels of software testing, which will be discussed in detail below.
System testing is a method of monitoring and assessing the behaviour of the complete and fully-integrated software product or system, on the basis of pre-decided specifications and functional requirements. It is a solution to the question "whether the complete system functions in accordance to its pre-defined requirements?"
It's comes under black box testing i.e. only external working features of the software are evaluated during this testing. It does not requires any internal knowledge of the coding, programming, design, etc., and is completely based on users-perspective.
A black box testing type, system testing is the first testing technique that carries out the task of testing a software product as a whole. This System testing tests the integrated system and validates whether it meets the specified requirements of the client. Other characteristics of system testing are:
As stated earlier, software testing life cycle consists of various levels of testing, which makes it crucial for us to understand when, in STLC, is system testing is executed by the testers. To help you with this, here are the scenarios when a tester can perform system testing, either manually or with the assistance of testing tools.
Some of the aspects, on which system testing focuses are
Before initiating the process of system testing it is vital for the team to consider all the requirements, which can impact the result of testing or make it more tedious. Therefore, mentioned below are some important prerequisites of system testing, for your reference.
Since the importance of system testing is immense in STLC, it is important that we define its process, to ensure that its procedure is executed accurately without missing any critical detail or step. Process of system testing can vary from project to project or organization, however, there are six common steps that are part of its process and which are defined below:
Like software testing, system testing is also an amalgamation of multifarious testing techniques, which allow the team to validate the overall performance and functionality of the product. Each of these testing techniques are focused on different aspects of the product and cater to various requirements of the client/user. These types of system testing are:
It is used to check desired functioning of the software, after its successful installation, along with, all necessary requirements
A type of black-box testing, that enables to assess and evaluate the proper functioning of the software, according to its pre-defined requirements.
It is achieved by, deliberate failure or crash of the software, to assess its ability of getting recovered, quickly.
It ensures, the ability of software to get compatible and interact with other software or system and their components.
It is done, to examine the response, stability, scalability, reliability and other quality metrics of the software, under different workloads.
Software should be scalable, along with the increase in load, number of concurrent users, data size, etc. This, arises the need of scalability testing, which is conducted to take care of scalability related issues, with the software.
This testing, assess the degree of the software, between two failures, and the time it takes to repair.
It guarantees the original functionality of the software, after each modification in it.
This involves, evaluation of documentation artifacts, prepared before and during the testing phase, in order to assess the testing requirements, covers under documentation testing.
To assess, the security features of the software, so as to ensure, protection, authenticity, confidentiality and integrity of the information and data.
Ensures software's user-friendliness feature and prevents end-users from issues or problems, while using and handling the software product.
System testing is performed by professional or individual testers for various reasons. From evaluating the system to ensuring its compliance with the specified requirements, this type of testing offers great aid to the testing team as well as the other stakeholders of the project. Few of the other reasons for performing this testing are:
Though performed after system testing, people usually assume acceptance testing to be a part of system testing. Therefore, to differentiate them from one another, here is a comparison between the two:
|System Testing||Acceptance Testing|
|1. System testing is a type of end to end and black box testing type.||1. Acceptance testing is a functionality testing type.|
|2. It is performed to ensure that the system meets the specified requirements of the client.||2. It is performed to ensure the compliance of the product with business requirements.|
|3. It is performed after the completion of integration testing.||3. It is performed after the culmination of system testing.|
|4. System testing is performed by independent testers as well as developers.||4. Acceptance testing is performed by testers as well as customers.|
|5. It can be both functional & non-functional testing type.||5. This type of testing is mainly functional testing type.|
Find more differences between these two levels of testing here.
An integral part of software testing life cycle, system testing is performed once the process of software development is completed and the product has gone through unit and integration testing. This testing is not limited to one aspect or component of the product but is used to test the software system as a whole, which makes it an important part of any successful testing cycle and hence should be implemented by testers who want to deliver superior user experience.
To find the differences between system testing & integration testing, click here.