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Software Testing and Quality Assurance

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Software Testing and Quality Assurance Lecture 10 - The Testing Perspective (Chapter 2, A Practical Guide to Testing Object-Oriented Software) Lecture Outline Testing ... – PowerPoint PPT presentation

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Title: Software Testing and Quality Assurance


1
Software Testing and Quality Assurance
  • Lecture 10 - The Testing Perspective (Chapter 2,
    A Practical Guide to Testing Object-Oriented
    Software)

2
Lecture Outline
  • Testing perspective
  • Object-Oriented Concepts
  • Object
  • Message
  • Interface

3
Testing Perspective
  • A way of looking at any development product and
    questioning its validity.
  • Person examining work products from this
    perspective utilizes
  • A thorough investigation of the software and
  • All its representations to identify faults.

4
Testing Perspective
  • Requires that a piece of software demonstrate
    that
  • It not only performs according to is
    specification, but
  • Performs only to that specification.

A product is tested to determine that it will do
what it is supposed to do, and it is also tested
to ensure that it does not do what it is not
supposed to do.
5
Testing Perspective
  • Skeptical
  • Wants proof of quality
  • Objective
  • Makes no assumptions
  • Thorough
  • Does not miss important areas
  • Systematic
  • Searches are reproducible

6
Object Oriented Concepts - Testing Perspective
  • OO programming is centered around
  • Object
  • Message
  • Interface
  • Class
  • Inheritance
  • Polymorphism

7
Object Oriented Concepts - Testing Perspective
  • There are wide range of meanings for these
    concepts. For example,
  • Distinction between operations and methods is not
    significant for most programmers.

8
Object Oriented Concepts - Testing Perspective
  • The distinction is significant to tester because
  • the approach to testing an operation, which is
    part of class specification and a way to
    manipulate an object,
  • is somewhat different from testing a method,
    which is a piece of code that implements an
    operation.

9
Object - Testing Perspective
  • An object is an operational entity that
    encapsulates both specific data values and code
    that manipulates those values. For example,
  • The data about a specific bank account and the
    operations needed to manipulate that data form an
    object.

10
Object - Testing Perspective
  • Objects are the direct target of the testing
    process during software development.
  • The life cycle for an object begins when it is
    created, proceeds through a series of status, and
    ends when the object is destroyed.

11
Object - Testing Perspective
  • An object encapsulates and hides information.
  • An object has a state that persists for the life
    of the object.
  • Testers care about
  • Whether the object behaves according to its
    specification.
  • Whether it interacts appropriately with
    collaborating objects in an executing program.

12
Message- Testing Perspective
  • A message is a request that an operation be
    performed by some object.
  • OO is a community of objects that collaborative
    by sending messages to one another.
  • A message has a sender (originating a message).
  • A message has a receiver (receiving the message).

13
Message- Testing Perspective
  • A message may include actual parameters.
  • Some messages result in some form of reply such
    as return value and exception.
  • Testers care about
  • Senders
  • Receivers
  • Parameters

14
Key points
  • Testing perspective a way of looking at any
    development product and questioning its validity.
  • Testing perspective is
  • Skeptical,
  • Objective,
  • Thorough and
  • Systematic.
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