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    M6-QR-Code Based Testing 2

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    ryan2318722
    The document discusses data flow testing methodologies. It defines data flow testing and defines key terms like definition, use, and definition-use pairs. It also outlines the steps to perform data flow testing and notes that it is a demanding technique but can be useful for reliability.

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    M6-QR-Code Based Testing 2

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    ryan2318722
    11 views11 pages
    The document discusses data flow testing methodologies. It defines data flow testing and defines key terms like definition, use, and definition-use pairs. It also outlines the steps to perform data flow testing and notes that it is a demanding technique but can be useful for reliability.

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    The document discusses data flow testing methodologies. It defines data flow testing and defines key terms like definition, use, and definition-use pairs. It also outlines the steps to perform data flow testing and notes that it is a demanding technique but can be useful for reliability.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    11 views11 pages

    M6-QR-Code Based Testing 2

    Uploaded by

    ryan2318722
    The document discusses data flow testing methodologies. It defines data flow testing and defines key terms like definition, use, and definition-use pairs. It also outlines the steps to perform data flow testing and notes that it is a demanding technique but can be useful for reliability.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
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    Software Testing

    Methodologies
    BITS Pilani Prashant Joshi
    Data Flow Testing

    • Data Flow testing refers to forms of structural testing that


    focus on the point at which variables receive values and
    the point at which these values are used (or referenced)

    • Data Flow testing serves as a “reality check” on path


    testing

    • Data Flow testing provides,


    • a set of basic definitions
    • a unifying structure of test coverage metrics

    2 Software Testing Methodologies


    Define/Reference Anomalies

    • A variable that is defined but never used


    (referenced)
    • A variable that is used but never defined
    • A variable that is defined twice before it is
    used

    • Static Analysis: Finding faults in code


    without executing it

    3 Software Testing Methodologies


    D-U Testing - Definitions

    • Program P has a program graph G(P) and a set of


    program variables V
    • G(P) has single entry and single exit
    • Set of all paths in P is PATHS(P)

    4 Software Testing Methodologies


    Data Flow Testing

    Concept: Use of Data Flow information for design


    of Test Cases
    – Definition-Use Pair (du pair)

    Definition: A definition is a statement that assigns a


    value to a variable
    – v=x+4; a definition of v
    – input(v); read and assign a value to v

    Use: An use is a statement that uses (references)


    a value of a variable
    – z=v+1; use of v
    – if (v>0); use
    – printf(v); use
    – v=v+1;
    5 Software Testing Methodologies
    Steps for Data Flow Testing

    • Identify all data flows (all definition-use) pairs in the


    program
    • Design a set of test cases such that each data flow
    (definition-use pair) is “executed” at least once

    6 Software Testing Methodologies


    Salient Features

    • Very demanding and effort intensive


    • Requires effort to design test cases
    • Best used where reliability requirement is high
    • Capability of detecting good defects

    7 Software Testing Methodologies


    Code Based Testing

    • Statement Testing
    • Branch Testing
    • Multiple Condition Testing
    • Loop Testing
    • Path Testing
    • Modified Path Testing (McCabe Path)
    • Dataflow Testing
    • Transaction Flow Testing

    8 Software Testing Methodologies


    Act of Measurement

    Measurement is the first step that leads to control and


    eventually to improvement. If you can’t measure
    something, you can’t understand it. If you can’t
    understand it, you can’t control it. If you can’t control it,
    you can’t improve it.
    H.James Harrington

    • Measure
    • Understand
    • Control
    • Improve
    9 Software Testing Methodologies
    Millers Test Coverage Metrics
    Metric Description of Coverage
    C0 Every Statement
    C1 Every DD-Path (DD-Path = Decision to Decision Path)
    C1p Every predicate to each outcome
    C2 C1 coverage + loop coverage
    Cd C1 coverage + every dependent pair of DD-paths
    CMCC Multiple Condition Coverage
    Cik Every program path that contains up to k repetitions of a
    loop (usually k=2)
    Cstat “Statistically significant” fraction of paths
    Cinfinity All possible execution paths

    10 Software Testing Methodologies


    Software Testing
    Methodologies
    BITS Pilani Prashant Joshi

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