Software Testing

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Software Testing

• By Marcin Starzomski P

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What is Testing ?

• Testing is a process used to help identify the
  correctness, completeness and quality of
  developed computer software. Testing is nothing
  but criticism or comparison, that is comparing
  the actual value with expected one.

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Ssoftware faults and Software failures

• failure - the software does not do what the user
  expects
• faults - error in the correctness of the semantic
  of a computer program

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White box(glass box) Testing

• In white box or "glass box", testing the test
  developer has access to the source code. They
  ensure that components used in the construction
  are functional to some degree.

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Black box Testing

• In black box testing the test engineer only
  accesses the software through the same interfaces
  that the customer or user would.

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Grey (Gray) Box Testing

• The typical grey box tester is permitted to set
  up or manipulate the testing environment. It can
  also be used of testers who know the internal
  workings or algorithm of the software under test
  and can write tests specifically for the
  anticipated results.

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ALFA Testing Phase

• In the first phase of alpha testing, developers
  test the software using white box techniques.
  Additional inspection is then performed using
  black box or grey box techniques.

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BETA Testing Phase

• Versions of the software, known as beta-versions,
  are released to a limited audience outside of the
  company. Testing during the beta phase,
  informally called 'beta testing, is generally
  constrained to black box techniques although a
  core of test engineers are likely to continue
  with white box testing in parallel to the beta
  tests.

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GAMMA Testing Phase

• Cynics have referred to all software releases as
  "gamma testing" since defects are found in almost
  all commercial, commodity and publicly available
  software eventually

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Remember !

• Alpha and beta refer to stages of the software
  before release (and also implicitly on the size
  of the testing community, and the constraints on
  the testing methods), white box, black box, and
  grey box refer to the ways in which the tester
  accesses the target.

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Cycle of testing

• Requirements Analysis Testing should begin in
  the requirements phase of the software life
  cycle(SDLC).
• Design Analysis During the design phase, testers
  work with developers in determining what aspects
  of a design are testable and under what parameter
  those testers work.
• Test Planning Test Strategy
• Test Development Test Scenarios, Test Cases,
  Test Scripts to use in testing software.
• Test Execution Testers execute the software
  based on the plans and tests and report any
  errors found to the development team.
• Test Reporting Once testing is completed,
  testers generate metrics and make final reports
  on their test effort and whether or not the
  software tested is ready for release.
• Retesting the Defects

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System testing

• Most software produced today is modular. System
  testing is a phase of software testing in which
  developers see if there are any communications
  flaws--either not passing information, or passing
  incorrect information--between modules.

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Code Coverage

• Code coverage is inherently a white box testing
  activity.process allows developers and quality
  assurance personnel to look for parts of a system
  that are rarely or never accessed under normal
  conditions (error handling and the like) and
  helps reassure test engineers that the most
  important conditions (function points) have been
  tested.
• process allows developers and quality assurance
  personnel to look for parts of a system that are
  rarely or never accessed under normal conditions
  (error handling and the like) and helps reassure
  test engineers that the most important conditions
  (function points) have been tested.

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Testing Dilema

• Exploratory vs. Scripted
• Manual vs. Automated

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• Thank you ? For paying atention to the end of teh
  presentation !