software Testing

1
Software Testing

• Created By Aarif Habeeb
• MCA,SEO SEM Expert, Website Developer
• aarifhabeeb_at_hotmail.com
• http//www.appsys.in

2
Agenda

• Introduction
• Goals of Testing
• Objectives of testing
• Levels of Testing
• Test Types
• VERIFICATION VALIDATION
• The testing process
• Testing phases
• Software Testing Difficulties
• Stages of Testing
• Conclusion
• Reference
• Question
• Contact us

3
Introduction

• What is Software Testing?
• Executing software in a simulated or real
  environment, using inputs selected somehow.

4
Goals of Testing

• Detect faults
• Establish confidence in software
• Evaluate properties of software
• Reliability
• Performance
• Memory Usage
• Security
• Usability

5
Objectives of testing

• To understand testing techniques that are geared
  to discover program faults
• To introduce guidelines for interface testing
• To understand specific approaches to
  object-oriented testing
• To understand the principles of CASE tool support
  for testing
• Executing a program with the intent of finding an
  error.
• To check if the system meets the requirements and
  be executed successfully in the Intended
  environment.
• To check if the system is Fit for purpose.
• To check if the system does what it is expected
  to do.

6
Continue.Objective

• A good test case is one that has a probability of
  finding an as yet undiscovered error.
• A successful test is one that uncovers a yet
  undiscovered error.
• A good test is not redundant.
• A good test should be best of breed.
• A good test should neither be too simple nor too
  complex.

7
Levels of Testing

• Unit Testing
• Integration Testing
• Validation Testing
• Regression Testing
• Alpha Testing
• Beta Testing
• Acceptance Testing

8
Test Types

• Functional tests
• Algorithmic tests
• Positive tests
• Negative tests
• Usability tests
• Boundary tests
• Startup/shutdown tests
• Platform tests
• Load/stress tests

9
VERIFICATION VALIDATION

• Verification - typically involves reviews and
  meeting to evaluate documents, plans, code,
  requirements, and specifications. This can be
  done with checklists, issues lists, walkthroughs,
  and inspection meeting.
• Validation - typically involves actual testing
  and takes place after verifications are
  completed.
• Validation and Verification process continue in
  a cycle till the software becomes defects free.

10
The testing process

• Component testing
• Testing of individual program components
• Usually the responsibility of the component
  developer (except sometimes for critical systems)
• Tests are derived from the developers experience
• Integration testing
• Testing of groups of components integrated to
  create a system or sub-system
• The responsibility of an independent testing team
• Tests are based on a system specification

11
Testing phases
12
Stages of Testing

• Testing in the Small
• Unit Testing
• Feature Testing
• Integration Testing
• Unit Testing
• Tests the smallest individually executable code
  units.
• Usually done by programmers. Test cases might be
• selected based on code, specification, intuition,
  etc.
• Tools
• Test driver/harness
• Code coverage analyzer
• Automatic test case generator

13

• Integration Testing
• Tests interactions between two or more units or
• components. Usually done by programmers.
• Emphasizes interfaces.
• Issues
• In what order are units combined?
• How do you assure the compatibility and
  correctness of externally-supplied components?

14
Software Testing Difficulties

• Most of the software testing literature equates
  test
• case selection to software testing but that is
  just one
• difficult part. Other difficult issues include
• Determining whether or not outputs are correct.
• Comparing resulting internal states to expected
  states.
• Determining whether adequate testing has been
  done.
• Determining what you can say about the software
  when testing is completed.
• Measuring performance characteristics.
• Comparing testing strategies.

15
Stages of Testing

• Testing in the Large
• System Testing
• End-to-End Testing
• Operations Readiness Testing
• Beta Testing
• Load Testing
• Stress Testing
• Performance Testing
• Reliability Testing
• Regression Testing

16
Conclusion
17
Reference

• www.appsys.in
• www.google.com
• www.wiki.com
• www.softwaretesting.com

18
Questions
19
Contact us

• Appsys Informatics Pvt Ltd
• info_at_appsys.in
• aarif_at_appsys.in
• 91-9829160120
• 0141-4020120
• www.appsys.in

20
Thank you