Test levels are groups of test activities organized and managed together concerning software at a given level of development, from individual units or components to complete systems.
Component testing, also known as a unit or module testing focuses on components that are separately testable.
Integration testing focuses on interactions between components or systems.
System testing focuses on the behaviour and capabilities of a whole system or product, often considering the end-to-end tasks the system can perform and the non-functional behaviours it exhibits while performing those tasks.
Typically focuses on the behaviour and capabilities of a whole system or product. Common forms of acceptance testing include the following:
User acceptance testing
Operational acceptance testing
Contractual and regulatory acceptance testing
Alpha and beta testing
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