What Is The Difference Between System Testing vs End to End Testing?
Both system and end-to-end testing hold very important positions in the Quality Assurance process of software. Testing is that stage in the software development life cycle at which the development that has occurred is verified.
The outcomes of testing are either that the software is working as expected or it will detect some defects and the software will be returned to the development team for correction.
Four Levels of the Testing Process
1. Unit Testing
This testing is done by developers to check a recently coded unit or a module.
2. Integration Testing
Integration testing is done before integrating a unit-tested module with the rest of the program.
3. System Testing
When all the components are integrated and the complete model of the software is created then system testing is done.
4. End to End Testing
This test is done to execute the software from beginning to end, like a user. This software will keep on rotating in this cycle until it passes the testing stage with the detection of any defect. One difference between System testing and End to end testing is the level at which each of these tests is done.
Before knowing ‘how both of these testing methodologies are different from each other?’ we will discuss them in detail.
System Testing in Software Testing
At the system testing stage, the software is completely developed to work as per specifications from the developer’s side and the final product will almost stay the same, though the software may have some bugs or defects.
Till this testing, all the components are integrated to work as one and the task of system testing is to check ‘if all the requirements and features are working in the desired way?’.
- System testing is a type of Black Box testing
- It is not concerned with the code or software design
- Focuses on determining if the system meets predefined needs
- Evaluates ease of interaction with the software
- Compares expected and actual results for given inputs
- Includes functional testing and performance testing
- Performance testing assesses efficiency under different loads and conditions
- Considers security testing to ensure application safety
- Usability testing checks if the application is easy to use
- Concerns about data security are addressed
- Accessibility testing ensures compliance with various protocols for easy user access
The testing will check for everything the stakeholders want to be present on the final product and let the team know about the scope of possible improvement. System testing can be completed using automated tools available in the market like Selenium, Appium.
E2E Testing in Software Testing
End-to-end testing is carried out after the system testing to check the working of the software from its beginning to the end. It tests for the efficiency of the software to accomplish the task that requires it to interact with interfaces available outside the system’s environment.
E2E testing is the overall testing of the software and is carried out with keeping the user experience on focus. The software is executed the way a user will be handling it to perform some task. It ensures that ‘if all the components within and outside the system are working properly with each other to accomplish a task and there is no hurdle in a feature’s path to behave the way it should be?’.
- Software testing involves interaction with databases, networks, hardware, and other applications.
- Identifies weak links in communication between components.
- Collaboration with other applications necessitates repeated actions.
- End-to-end testing is time-consuming and requires effort.
- Thorough testing ensures quality user experience.
- Tester's knowledge about the system impacts testing productivity.
- Automation tools may not suffice due to complexity in writing tests for dependent applications.
Difference Between System Testing And End to End Testing
Below are the differences between system testing and end to end testing:
| System Testing | End to End Testing |
| This testing validates ‘if the software meets all the requirements and the specifications or not?’ and the system works as expected in itself. | This testing not only validates the workflow of the software is in itself but also its subsystems. |
| It tests for the proper working of the functionalities and the features of the software. | It tests the working of the software from its beginning to the end it includes every component of the software. |
| At this level only the functional and non-functional testing is done. | At this level, the communication within the system and with all the interfaces like with the backend and the subsystems is tested. |
| This testing is done after the integration testing. | This testing is done after system testing is over. |
| System testing can be done automatically or manually as per requirement. | Manual E2E testing is preferred over automated testing as it is very complex to write test cases to run automatically for systems that work in integration with multiple systems. |
System Testing and E2E testing help bring bugs to the knowledge of the developer’s team when the basic development of the software is almost done. This is how the Quality Assurance team can get the product ready for deployment.
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