Difference between system, integration and E2E tests

Reference: https://medium.com/@ogedengbe_idowu/difference-between-system-integration-and-e2e-testing-f28bdddf6c70 

System Testing

This is the level of testing that validates the complete and fully integrated software product. The purpose of a system test is to evaluate compliance with its specified requirements and specifications. Usually, the software is only one element of a larger computer-based system. Ultimately, the software is interfaced with other software/hardware systems. System Testing is actually a series of different tests whose sole purpose is to exercise the full computer-based system. System testing seeks to detect defects both within the “inter-assemblages” and also within the system as a whole. The actual result is the behaviour produced or observed when a component or system is tested.

system testing is carried out to achieve the following:

·         Testing the fully integrated applications including external peripherals in order to check how components interact with one another and with the system as a whole.

·         Verify thorough testing of every input in the application to check for desired outputs.

·         Testing of the user’s experience with the application.

Below are some types of system testing performed in the software industry

·         Usability testing — mainly focuses on the user’s ease to use the application, flexibility in handling controls and ability of the system to meet its objectives.

·         Load Testing -is necessary to know that a software solution will perform under real-life loads.

·         Regression Testing – involves testing done to make sure none of the changes made over the course of the development process has caused new bugs. It also makes sure no old bugs appear from the addition of new software modules over time.

·         Recovery testing — is done to demonstrate a software solution is reliable, trustworthy and can successfully recoup from possible crashes.

·         Migration testing- is done to ensure that the software can be moved from older system infrastructures to current system infrastructures without any issues.

·         Functional Testing — Also known as functional completeness testing, it involves trying to detect any possible missing functions. Testers might make a list of additional functionalities that a product could have to improve during functional testing.

·         Hardware/Software Testing — This is when the tester focuses his/her attention on the interactions between the hardware and software during system testing.

Integration Testing

Integration testing is defined as a type of testing where software modules or systems are integrated logically and tested as a group. A typical software project consists of multiple software modules, coded by different programmers. The purpose of this level of testing is to expose defects in the interaction between these software modules when they are integrated. Integration Testing focuses on checking data communication amongst these modules against the requirement of the system specification.

End To End Testing(E2E)

End to end testing (E2E testing) refers to a software testing method that involves testing an application’s workflow from beginning to end. This method basically aims to replicate real user scenarios so that the system can be validated for integration and data integrity.

Essentially, the test goes through every operation the application can perform to test how the application communicates with hardware, network connectivity, external dependencies, databases, and other applications. Usually, E2E testing is executed after functional and system testing is complete.

Software systems nowadays are complex and interconnected with numerous subsystems. If any of the subsystems fails, the whole software system could crash. This is a major risk and can be avoided by end-to-end testing.

 

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