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Automated Quality Assurance. Philip Johnson Collaborative Software Development Laboratory Information and Computer Sciences University of Hawaii Honolulu HI 96822. Objectives.

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Automated quality assurance

Automated Quality Assurance

Philip Johnson

Collaborative Software Development Laboratory

Information and Computer Sciences

University of Hawaii

Honolulu HI 96822


Objectives
Objectives

  • Understand motivation for automated quality assurance through static analysis, and how it differs from “manual” quality assurance.

  • Learn about various automated quality assurance tools.

  • Understand the strengths and weaknesses of the Java-based static analysis tools used in this class (Checkstyle, PMD, FindBugs).


Quality assurance
Quality Assurance

  • High level:

    • Does the system satisfy the three prime directives?

  • Low level:

    • Does the system have “good” tests?

    • Does the system conform to coding standards?

    • Does the system contain code known to be defect-prone?

    • Does the system satisfy its requirements?

  • We use a combination of “manual” and “automated” techniques to assess QA at the “high” and “low” levels.


Manual qa
Manual QA

  • Examples of manual QA techniques:

    • Writing unit tests with JUnit

    • Conducting code reviews.

  • Strengths of manual QA:

    • Find defects involving requirements.

    • Low false positive rate.

  • Weaknesses of manual QA:

    • Difficult/expensive approach to low-level implementation defects.

    • Must be redone for all projects.


Automated qa
Automated QA

  • Examples of automated QA:

    • Lint, Checkstyle, PMD, FindBugs, DependencyFinder, Coverity, FxCop

  • Strengths of automated QA:

    • Can find classes of implementation defects that developers may not be skilled enough in the language/environment to detect via testing or inspection!

    • Can be reused on any project.

  • Weaknesses:

    • Potential high false positive rate.

    • Does not find requirements-level defects.




Checkstyle
Checkstyle

  • Checkstyle performs source code analysis.

    • Originally for "coding standard" (formatting)

    • Now includes design-level best practice compliances.

  • Classes of checks:

    • JavaDoc, Naming Conventions, Headers, Size Violations, Imports, WhiteSpace, Modifers, Block Checks, Coding, Class Design, Duplicate Code, Metrics, J2EE.

  • Can be extended with new checks.

  • Use a configuration file to customize what checks your system should comply with.


PMD

  • PMD also performs source code analysis.

    • More 'design' oriented than Checkstyle.

    • Lots of overlap.

  • PMD rulesets:

    • Basic, Braces, Code Size, Clone, Controversial, Coupling, Design, Finalizers, Import, J2EE, JavaBeans, JUnit, Logging, Migrating, Naming, Optimizations, Exceptions, Strings, Security, Unused Code, JSP, JSF.

  • Eventually, can choose one of PMD/Checkstyle.


Findbugs
FindBugs

  • FindBugs analyzes byte codes, not source codes.

  • Example problem: ignored return value:

    • String b = "bob"; b.replace('b', 'p'); if(b.equals("pop")){...}

  • FindBugs defect detectors are quite different in nature from source code analyzers because the system can perform forward and backward data flow.


Qa in this class
QA in this class

  • One goal of this course is to provide you with a set of techniques to build

    • high quality systems

    • as fast as possible

  • To accomplish this, you must learn how to apply the correct mix of automated and manual QA techniques.

    • Don’t write tests (or do reviews) to catch defects that an automated QA tool can find.

    • Don’t believe that automated QS tools can find all of your errors.


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