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Difference between system, integration and E2E tests


System testing is performed to check the following points:

  • To check whether the software system is made according to the customer needs to be written in Software Requirements Specifications, it meets both functional and non-functional design requirements of the system.
  • When all the modules are combined as a whole, many errors and facts may arise which may not give the expected results? So system testing is performed to find the defects or bugs in all the interfaces as well the whole system.
  • To execute the real-life scenarios on the software. It is done on the staging server which is very much similar to the production server where the software would actually be deployed. The system test cases are made according to the end–to–end-use perspective.

Integration testing is performed to check the following points:

  • To check whether the modules developed by individual developers when combined are according to standards and give the expected results.
  • When modules are combined, sometimes the data travelling between modules has many errors which may not give the expected results. So integration testing is performed to find the defects or bugs in all the interfaces.
  • To check the integration between any third-party tools used

E2E testing is performed to check the following points:

  • Keep a check and perform system flow verification.
  • Increase the test coverage areas of all the subsystems involved with the software system.
  • Detects issues, if any with the subsystems and thus increases the productivity of the whole software system.


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