What is meant by system testing?

What is the difference between end-to-end and system testing?

So far I haven't found any articles explaining the differences between end-to-end testing and system testing.

This is a video that explains it: But I couldn't find any official, good article that explains what are the differences between the two types of testing in details. So, my question is: How are they different from each other? Both End to End and System Testing try to test a system under identical test conditions (such as temperature, humidity, noise etc.) End to End testing is done by simulating real world situations with the actual user equipment. For example, suppose a user goes to a website and decides to call someone. The caller's phone has GPS, an Address Book with names of friends, contacts from their address book and more. The application running on their phone is the caller app. The website and phone provider have a call flow between them where a connection is established. Once a call connection is established, the caller has to press a number to start calling the person. Now the phone app on the phone dials out the phone number. The phone company's server confirms that the call has been accepted and then calls the person to start the conversation. These are all End-to-End test scenarios.

System Testing can be done for different operating systems, browsers, databases, email clients, social media applications, apps for phones, tablets, smartwatches, PCs, TVs etc. The objective of System Testing is to simulate real world conditions and also the behavior of the system under those conditions. This approach can be done manually or with the help of automation tools.

Note: End to End Testing can happen in isolation or along with System Testing.

What is the difference between system testing and functional testing?

The two are often confused.

While one is a subset of the other, they are separate types of testing and can both be very valuable to the success of your product, especially in conjunction with the other type(s) of testing that will be included later.

System testing is testing the application as a whole. This would include tests for basic functionality (input-output, security, and general usability), along with the ability to validate and/or ensure that all of the underlying components (middleware, server, database, OS, file system, drivers, etc.) function properly in conjunction with each other.

Functional testing is testing individual components or modules of an application. This would include tests for functionality (input-output), validation (checks values that should be true), and usability (inputs that change the UI).

The system testers (and sometimes the functional tester) focus on testing the whole. A system tester would not think about input-output for the purpose of functional testing, but she may test for system-wide failures when validating inputs or outputs. However, there are times when it is extremely valuable to get feedback from someone with a more narrow understanding of the system. Even if that doesn't result in a fix for a bug, it does mean you aren't wasting as much time focusing on something that is already known. That doesn't mean you shouldn't still go over the existing input-output; it's simply another angle at validating and confirming that what the system is currently capable of. It could also mean that you haven't included every possible way that the user might be able to trigger the bug - and this will definitely lead to a faster fix.

Testing methodologies will take into account the needs of all users, including non-techies. System tests may not include every possible scenario, so they should provide the most bang for the buck with the least amount of pain. Functions should be developed to help guide all parts of the test cycle, starting with unit tests. They will provide a baseline value for system, architecture, and business requirements.

Test plan and script are defined to ensure successful testing. Automated test plan and test scenarios are developed to help drive the design for test coverage.

The following sections will provide additional information on the types of testing and their purposes, and how they interact with each other.

What is the difference between system integration and E2E test?

System integration testing means that you are working on the whole solution. What I mean is you are testing the end to end flow, from login to the dashboard etc.

The E2E testing means that you are only testing the endpoints or the specific UI of the application. And what is the difference between system integration and functional testing? These questions are a bit subjective, but here is my interpretation: System integration testing (SIT) is working on the complete software application. You should have a good understanding of the domain, so you can test how your components and service work together. SIT may include unit, integration and system testing. The term E2E may be misleading, since it implies that you are testing the full stack, but E2E testing in most cases only means the individual steps of the application.

Functional testing is testing the functionality of individual units (eg a controller) as well as the complete application. The difference is that functional testing includes end-to-end testing, while system integration testing does not.