1 testing methodology. 2 purpose introducing testing methodology for planning and executing software...
TRANSCRIPT
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Testing Testing MethodologyMethodology
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Purpose
Introducing Testing Methodology for planning and executing software tests, the stages and deliverables
within the testing process.
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Content
The difference between SW testing and SW debugging.
Subjects to be tests.Tests LevelsTests ClassesTesting life-cycle.Testing and SW development
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Testing
•Verify match to system specification.•Usually done by external and neutral entity.•Planed and controlled process.
Debugging
•Verify code section validity.
•Done by the developer.
•A random process
The difference between SW Testing & Debugging
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Evolution of Test Objectives
Prevention Control Quality
Detect Find Defects
Demonstration Show it works
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Cost Diagram
x
x
Cost
TimeDesign
Integration
Custom
er
x
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Test Level
Unit or Debug.Module/Sub-System.Integration.System.Acceptance.
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Test Classes
Regression.Side effects.Redundancy.Stress and Load.Recovery.
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BLACK BOX
Input Output
Spec
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WHITE BOX
IF
DOEND
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Testing life-cycle V.S.
Development Life-Cycle
ExecutionExecutionSTRSTR
ExecutionExecutionSTRSTR
STDSTDSTDSTD
TRDTRDTRDTRD
STPSTPSTPSTPTop Level Design
Top Level Design
SW Detail Design
SW Detail Design
Coding and Unit test
Coding and Unit test
Coverage
Tractability
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STRSTRSTRSTR
ExecutionExecutionExecutionExecutionSTDSTDSTDSTD
TRDTRDTRDTRD
STP - Software Test Plan. TRD - Test Requirement
Definition. STD - Software Test Description. Tests Execution or Test Cycles. STR - Software Test Report.
Testing Life-Cycle
STPSTPSTPSTP
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Software Test Plan
A master plan that details the scope of work, timetable, testing requirements and issues to be test.
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Test Requirement Definition
Specify what case should be tested for each defined
topic.
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Software Test Description
Specify executable steps and expected results for each test
case.
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Software Test Report
Summarize the content of each test cycle, test results and set
conclusions about the tested system quality
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Coverage
The linkage between system specifications and testing
specifications
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Tractability
The linkage of tested topics between two of the testing
specifications
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Requirements Definition
Defining system requirements as perceived by the users.
Based on analysis of current situation, market research, etc.
Product: Software Requirement Specification (SRS).
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Unit Testing
Testing of single function/program/screen/feature.
Executed by the programmers.Pre-defined.Results need to be documented.Use of simulators for inputs and
outputs.
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Integration Testing
Testing the functioning of a few modules simultaneously.
Coexistence testing.Testing carried out by
programmers or test analysts.Pre-planned testing.Results to be documented.
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Software Test Plan
Defines structure for the testing project.
Allows the customer to assess project content.
Explains the testing methodology to be used.
Maps system via hierarchical breakdown.
Describes the resources required for the testing.
Defines schedule .
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TRD - Test Requirements Definition
Further break down the system requirements as based on the STP.
Describes what is to be tested for each component and function.
Includes a set of testing requirements in a constant format.
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STD - Software Test Description
Describes how to test the system.Operative description of the testing
process
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System Testing
Testing the application as a whole as per the testing design (STD & TRD).
Various testing types:-functionality -performance
-stress and load -concurrence
Testing is carried out by test engineers.Testing is comprised of a few cycles.Results are documented.The testing process must be managed.
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Acceptance Test (ATP)
Testing carried out by the customer to define if customer’s requirements were met.
Repetition of some of the system tests.Needs to be planned and conducted by
the customer.Many times it is given up or the
responsibility is given to the vendor.
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Installation and Conversion
Packaging the software and installing it in the customer’s production environment.
Conversion of old database to new database.
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Models of Software Systems Development
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V-model
Integration test
Requirements
Top level design
Detail design
Coding
Unit test
System test
ATPInitiation
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RAD model
User Requirement
CODE
Acceptance Test
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Waterfall model
Each phase of the V-model is completed in each effort before moving onto the next phase.
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Each phase of the V-model is completed in each effort before moving onto the next phase.
Gradual Development
Spiral model
This model is used when the final product has not been finally designed.