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UT (Unit Test) is the unit test in the software testing category. It tests the smallest measurable unit zhi in the program du. The commonly understood unit test is the code test with dao, usually some white box tests are used. Methods to cover related source code, such as a function in C language, a class in Java, this kind of test requires testers to have strong coding ability, currently most companies use development self-test;
IT (System Integration Test) is the integration test in the software testing category. It is based on the unit test, the software units (functional modules) are assembled and tested for modules, subsystems, and systems according to the outline design specification. To check whether each part of the system can meet the corresponding technical indicators and requirements, integration testing needs to focus on the interface between each module;
ST (System Test) refers to the system test in the software test category. It tests the software as a whole, focusing on system elements such as computer hardware, external equipment, third-party software, data and personnel, and environmental factors.
UAT (User Acceptance Test) refers to the acceptance test in the software testing category. It is mainly led by the customer to check whether the software implemented by the software implementer meets the needs of the customer's business side in accordance with the signed contract, technical agreement and requirements specification specification.