Only through the interface of the object
Breaks encapsulation boundaries by allowing the potential for dependency on the internals of another class' internal data/implementation
Black-Box, data-drive, or input/output driven testing
White-Box, glass box, or logic-driven testing
Positive test case
Valid input that the program is designed to process
Negative test case
Invalid or unexpected input that the program is not designed to process
A set of creation and initialization steps useful for a set of different related tests
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