Definitions
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Stub
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Minimal implementations of interfaces or base classes
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Spy
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A Spy will record which members were invoked
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Fake
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More complex, a fake may resemble a production implementation
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Mock
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It is usually dynamically created by a mock library and depending in its configuration a mock can behave like a dummy, a stub, or a spy.
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Comments
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All
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They all relate to functions, objects and other types.
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Stub
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Stubbing is a way to provide dummy data/info instead of making the calling to the actual DB
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Fake
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It is for example a function which you create inside the test file to mimic the real function or be a simplified version of the actual function.
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