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Explain testing approach from perspective of OO development method. Also explain advantages and disadvantages of using this method... fast​

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Unit testing, system testing, and acceptance testing are all common testing tiers for software. In in-unit testing, tiny "units," or software modules, are typically tested independently with a focus on the code of that module. Higher-order testing, such as acceptance testing, examines the functionality or external behaviour of the system as a whole (or a system's component parts).

The object-oriented paradigm is growing in popularity as information systems become more complex due to its advantages in analysis, design, and coding. Because of issues with testing classes, abstract classes, inheritance, dynamic binding, message passing, polymorphism, concurrency, etc., conventional testing methods cannot be used.

The challenge of testing classes is fundamentally distinct from that of testing functions. a feature (or a process) has an input-output behaviour that is precisely specified, whereas a class lacks such a definition. Using techniques for testing functions, we can test a method of a class, but we cannot test the class as a whole.

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