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Incremental Testing of Object-Oriented Class Structures
14th International Conference on Software Engineering
May 1992, pp. 68-80
Mary Jean Harrold, John D. McGregor, and Kevin Fitzpatrick
Abstract
Although there is much interest in creating libraries of
well-designed, thoroughly-tested classes that can be
confidently reused for many applications, few
class testing techniques have been developed.
In this paper, we present a class testing technique that
exploits the hierarchical nature of the inheritance
relation to test related groups of classes by reusing the
testing information for a parent class
to guide the testing of a subclass.
We initially test base classes having no parents by designing
a test suite that tests each member function individually and
also tests the interactions among member functions.
To design a test suite for a subclass, our algorithm
incrementally updates the
history
of its parent
to reflect both the modified, inherited attributes and the subclass's
newly defined attributes.
Only those new attributes or affected, inherited attributes are
tested
and the parent class's test suites are reused, if
possible, for the testing.
Inherited attributes are retested in their new context in
a subclass by testing their interactions with
the subclass's newly defined
attributes.
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