Difference between system, Integration and E2E test

System, Integration, and E2E (End-to-End) testing are all important parts of software development, but they focus on different levels and aspects of the software.

Here's a breakdown of their key differences:



System Testing:

System testing is actually a series of different tests whose sole purpose is to exercise the full computer based system. It focuses on how well the system meets its functional and non-functional requirements (performance, usability, security). This testing primarily concerned with validating the overall functionality and behaviour of the entire system. It might involve various testing methodologies (functional, performance, usability) and can be time-consuming. Mainly System testing, typically performed towards the later stages of development after all functionalities are implemented.

Integration Testing:

Integration testing is defined as a type of testing where software modules or system are integrated logically and tested as a group. A typical software project consists of multiple software modules, coded by different programmers. It ensures data flows smoothly between different parts of the software. t ensures modules exchange data correctly and function cohesively as a unit. This is generally less complex than system testing as it deals with smaller units. This can be done throughout the development life-cycle, as new modules or features are integrated with existing ones.

E2E Testing:

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. This falls somewhere in between system and integration testing. It simulates real-world user scenarios and workflows, testing how various functionalities and components work together from start to finish to achieve a specific goal.

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