Software testing lecture 9

Software Testing
By Fazal Wahab

What is Software Testing?
 Several definitions:
“Testing is the process of establishing confidence that a program or
system does what it is supposed to.” by Hetzel 1973
“Testing is the process of executing a program or system with the
intent of finding errors.” by Myers 1979
“Testing is any activity aimed at evaluating an attribute or capability
of a program or system and determining that it meets its required
results.”
by Hetzel 1983

What is Software Testing?
What is IEEE’s definition?
 One of very important software development phases
 A software process based on well-defined software quality
control and testing standards, testing methods, strategy, test
criteria, and tools.
 Engineers perform all types of software testing activities to
perform a software test process.
 The last quality checking point for software on its production
line

Testing Objectives
 The Major Objectives of Software Testing:
 Uncover as many as errors (or bugs) as possible in a given timeline.
 Demonstrate a given software product matching its requirement
specifications.
 Validate the quality of a software testing using the minimum cost and efforts.
 Generate high quality test cases, perform effective tests, and issue correct
and helpful problem reports.
 Major goals:
 uncover the errors (defects) in the software, including errors in:
- requirements from requirement analysis
- design documented in design specifications
- coding (implementation)
- system resources and system environment
- hardware problems and their interfaces to software

Who does Software Testing?
- Test manager
- manage and control a software test project
- supervise test engineers
- define and specify a test plan
- Software Test Engineers and Testers
- define test cases, write test specifications, run tests
- Independent Test Group
- Development Engineers
- Only perform unit tests and integration tests
- Quality Assurance Group and Engineers
- Perform system testing
- Define software testing standards and quality control process

Software Testing Scope
Software Testing
Process
Software Testing
Management
Configuration
Management
Software Problem
Management
Software Testing
Methods
Software Test
Criteria
Software Testing
Tools
Software Test
Models
Software Testing
Strategies

Software Testing Activities
 Test Planning
Define a software test plan by specifying:
- a test schedule for a test process and its activities, as well as assignments
- test requirements and items
- test strategy and supporting tools
- Test Design and Specification
- Conduct software design based on well-defined test generation methods.
- Specify test cases to achieve a targeted test coverage.
- Test Set up:
- Testing Tools and Environment Set-up
- Test Suite Set-up
- Test Operation and Execution
- Run test cases manually or automatically

Software Testing Activities
 Test Result Analysis and Reporting
Report software testing results and conduct test result analysis
- Problem Reporting
Report program errors using a systematic solution.
- Test Management and Measurement
Manage software testing activities, control testing schedule, measure
testing complexity and cost
- Test Automation
- Define and develop software test tools
- Adopt and use software test tools
- Write software test scripts and facility
- Test Configuration Management
- Manage and maintain different versions of software test suites, test
environment and tools, and documents for various product versions.

Verification and Validation
Software testing is one element of a broader topic that is often referred to as
===> Verification and Validation (V&V)
Verification --> refers to the set of activities that ensure that software correctly
implements a specific function.
Validation -> refers to a different set of activities that ensure that the software
that has been built is traceable to customer requirements.
Boehm [BOE81]:
Verification: “Are we building the product right?”
Validation: “Are we building the right product?”
The definition of V&V encompasses many of SQA activities, including
formal technical reviews, quality and configuration audits
performance monitoring, different types of software testing
feasibility study and simulation

Software Quality Factors
Functionality (exterior quality)
- Correctness, reliability, usability, and integrity
Engineering (interior quality)
- Efficiency, testability, documentation, structure
Adaptability (future qualities)
- Flexibility, reusability, maintainability

Software Testing Principles
• Principle #1: Complete testing is impossible.
• Principle #2: Software testing is not simple.
• Reasons:
• Quality testing requires testers to understand a system/product completely
• Quality testing needs adequate test set, and efficient testing methods
• A very tight schedule and lack of test tools.
• Principle #3: Testing is risk-based.
• Principle #4: Testing must be planned.
• Principle #5: Testing requires independence.
• Principle #6: Quality software testing depends on:
• Good understanding of software products and related domain application
• Cost-effective testing methodology, coverage, test methods, and tools.
• Good engineers with creativity, and solid software testing experience

Software testing lecture 9

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