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Mastering Software Testing with JUnit 5 by Boni García

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Integration testing

Integration testing should expose defects in the interfaces, and the interaction between integrated components or modules. There are different strategies for performing integration testing. These strategies describe the order in which units are to be integrated, presuming that the units have been separately tested. Examples of common integration strategies are the following:

  • Top-down integration: This strategy starts with the main unit (module), that is, the root of the procedural tree. Any lower-level module that is called by the main unit should be substituted by a test double. Once testers are convinced that the main unit logic is correct, the stubs are gradually replaced with the actual code. This process is repeated ...

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