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Static Testing

1. What is Static Testing?

Static Testing is testing a work product without the work product code being executed.

What can be reviewed?

Any work product can be Examined by Static Testing

  • Project progress: work completed to schedule, etc.
  • SRS, system designs, codes, test plans, test cases

What can be Inspected?

  • Policy, strategy, business plans, marketing or advertising material, contracts
  • System requirements, feasibility studies, acceptance test plans
  • Test plans, test designs, test cases, test results
  • System designs, logical & physical
  • Software code
  • User manuals, procedures, training material

What to Review/ Inspect?

Review Inspect
Informal, formal quick Formal, take more time
Any work product can be reviewed, Compared to inspect, Review has boarder meaning Not all work prodict can be inspected
Not bring as much value as inspect Bring more values
The subject of review is typically documented or not The subject of inspected is typically documented
Method: Individual review, Group review Method: Individual review, Group review

2. Why is Static Testing?

  • Static testing enables the early detection of defects before dynamic testing is performed
  • Defects found early are often much cheaper to remove than defects found later in the lifecycle, especially compared to defects found after the software is deployed and in active use
  • Increasing development productivity
  • Reducing development cost and time
  • Reducing testing cost and time
  • Identifying defects which are not easily found by dynamic testing
  • Detecting and correcting defects more efficiently, and prior to dynamic test execution

The two main types of static testing techniques are:

  1. The manual examination of work products:( i.e REVIEWS)
  2. Tool-driven evaluation of the code or other work products ( i.e STATIC ANALYSIS)

Review process

The review process comprises the following 5 main activities:

  1. Planning
  2. Initiate review
  3. Individual review
  4. Issue communication and analysis
  5. Fixing and reporting

Roles and responsibilities

  • Author: writer or person with chief responsibility for the documents to be reviewed / Inspected
  • Managers: excluded from some types of review, need to plan project time for review / Inspection. Decides on the execution of reviews, allocates time in project schedules and determines if the review objectives have been met.
  • Facilitator (often called moderator): plans the review / Inspection, chooses participants, helps & encourages, conducts/leads the meeting or review, performs follow-up, manages metrics, mediates between various points of view, person whom the success of the review rests.
  • Reviewers leader: with specific technical or business background, specialised fault-finding roles for Inspection, should be chosen to represent different perspectives
  • Scribe / Recorder: documents all the issues, problems and open points that were identified during the meeting

Review Types

Informal review

  • Main purpose: detecting potential defects
  • Not based on a formal (documented) process
  • Review meeting: led by author
  • Performed by: a colleague of the author (buddy check) or by more people
  • Results : may be documented
  • Use of checklists: optional
  • Very commonly used in Agile development (e.g., buddy check, pairing, pair review)

⇒ widely viewed as useful and cheap (but no one can prove it!) A helpful first step for chaotic organisations.

Walkthrough

  • Main purposes: find defects, improve the software product, consider alternative implementations, evaluate
  • conformance to standards and specifications
  • Individual preparation before the review meeting: optional
  • Review meeting: Yes, led by the author of the work product
  • Scribe: mandatory
  • Use of checklists: optional
  • May take the form of: scenarios, dry runs, or simulations
  • Result: Potential defect logs and review reports may be produced
  • May vary in practice from quite informal to very formal

⇒ Author guides the group through a document and his or her thought processes, so all understand the same thing, consensus on changes to make

Technical review

  • Main purposes: gaining consensus, detecting potential defects
  • Reviewers: should be technical peers of the author, and technical experts in the same or other disciplines
  • Individual preparation before the review meeting: is required
  • Review meeting: optional, ideally led by a trained facilitator (typically not the author)
  • Scribe: mandatory, ideally not the author
  • Use of checklists: optional
  • Result: Potential defect logs and review reports are typically produced

⇒ includes peer and technical experts, optional or no management participation. Normally documented, fault-finding. Can be rather subjective.

Inspection

  • Main purposes: detecting potential defects, preventing future similar defects
  • Follows a defined process with formal documented outputs: based on rules and checklists
  • Uses clearly defined roles
  • Individual preparation: is required
  • Review meeting: Yes, is led by a trained facilitator (not the author)
  • Reviewers: are either peers of the author or experts in other disciplines that are relevant to the work
  • product
  • Specified: entry and exit criteria are used
  • Scribe: mandatory
  • Result: Potential defect logs and review report are produced

⇒ Formal individual and group checking, using sources and standards, according to generic and specific rules and checklists, using entry and exit criteria, Leader must be trained & certified, metrics required


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