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Inheritance and Object Class Testing

publish date: 2026/06/17 05:25:30.628987 UTC

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Why does inheritance or generalization make object class testing more complicated?

Inherited methods are hidden and cannot be called directly during testing

Inheritance prevents the use of automated test frameworks like JUnit

An inherited operation may make assumptions about other operations and attributes that may not be valid in all subclasses

Inherited methods are always slower and require performance testing

Correct Answer

An inherited operation may make assumptions about other operations and attributes that may not be valid in all subclasses

Explanation

Inheritance complicates testing because you cannot simply test an operation in the class where it is defined and assume it works in all subclasses. An inherited operation may make assumptions about other operations and attributes that may not be valid in some subclasses. Therefore, inherited operations must be tested everywhere they are used.

Reference

Software Engineering, Ian Sommerville, 10th edition

Quizzes you can take where this question appears

Unit Testing