Integration testing of software testing

1. Concept of integration testing

1. Integration testing is also called assembly testing, joint testing, subsystem testing or component testing.

2. Integration testing is to assemble all modules into subsystems or systems according to the outline design requirements (such as according to the structure diagram) on the basis of unit testing for integration testing.

2. Purpose of integration testing

1. Find out the module interface and the overall architecture problems;

2. Ensure that the components can work together as intended when combined, and ensure that the incremental behavior is correct;

3. The integration test is a gray box test;

1) Verify that the interface conforms to the design;

2) Discover errors in design and requirements.

3. The focus of integration testing

Although some modules can work normally alone, they cannot be guaranteed to work normally when connected. Problems that cannot be reflected in some parts of the program may be exposed globally., which affects the realization of the function.

Therefore, integration tests should consider two questions:

1. Interface between modules (two points to consider)

1) When connecting each module, whether the data passing through the module interface will be lost;

2) Is there any problem with the global data structure and will it be modified abnormally.

2. Integrated functions (three points need to be considered)

1) Can the sub-functions be combined to meet the expected parent function;

2)Whether the function of one module will adversely affect the function of another module;

3) Will the accumulated errors of a single module be amplified to an unacceptable level?

4. Level of integration testing

The development process of a product includes a hierarchical design and gradual refinement process, from the initial product to the smallest unit can be divided into: product -> subsystems --> hardware subsystem, software subsystem -> software module - software program -> unit.

The general unit test is aimed at the smallest unit structure, the system test corresponds to the product level, and all the tests of each layer need to be completed through the integration test.Divide integration tests into 3 levels:

1. Integration test within the module (after the unit test is completed)

2. Intra-subsystem integration test, namely inter-module integration test

3. Inter-subsystem integration test

For more information on testing technology, please pay attention to: Shenzhen Multi-Tester Software and Technical Service Co., Ltd.