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Unit Testing

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In Unit Testing individual components (“units”) of source code are tested in isolation of any other component. As a result the functionality of each individual component can be proven.

Unit Tests are the “foundation” of software testing, as they guarantee that the functionality works as intended - that is: as expressed in the software tests.

Writing code, that is “unit testable” implies that the resulting components “expose their dependencies”. Or vice versa: Code, that has hidden dependencies is not unit-testable in a clean way.

Dependencies in Unit Tests need to be mocked, stubbed, written as test-dummies, etc.

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