axioms paul gerrard the testing of
TRANSCRIPT
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Paul Gerrard
THE
TESTINGOF
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There is no agreed set of laws.
Is our profession based on weak foundations?
I REPEAT….
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American Heritage Dictionary:
Test: (noun)• A procedure for critical evaluation;• A means of determining the presence,
quality, or truth of something;• A trial.
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Many books on software testing…
And there appear to be 713 of them …
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Testing as a lifecycle activity
Model-based testing
Test-obsessed
Testing as exploration
Business goal-based testing
Agile testing
Test-first, test-driven
Risk-based testing
Testing as learning
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Practices are always
context-sensitive
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“Murder is wrong” is axiomatic.
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ALL the Axioms have been compared with the writings of the folk who
have objected.
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Too many schools push dogma, demand obedience to school
rules and mark people for life. They put up barriers to entry and exit and require members to sing the same school song. No thanks.
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The Axiom
Axioms are one-liners that succinctly state the
principle.
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Testing has no meaning without
stakeholders
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You need a source of knowledge to
select things to test
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Test needs a source of
knowledge to evaluate actual
behaviour
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Your sources of knowledge are
fallible and incomplete
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If you don’t manage scope, you may never
meet stakeholder expectations
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Test design is based on models
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Testing requires a coverage model or models
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The usefulness of the intelligence
produced by test determines the value of testing
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Test execution requires a
known, controlled
environment
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Testing never goes as planned
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The most important tests are those that uncover the
best intelligence, fast
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Run your most important tests first – you may not have time to run them
later
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Repeated tests are inevitable
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Acceptance is always a
compromise
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Testing never finishes; it
stops
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The value of intelligence is
independent of who produces it
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Suggestions?
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TestStrategy
Risks
Goals
ConstraintsHuman resourc
e
EnvironmentTimescales
Process(lack of?)
Contract
Culture
Opportunities
User involvement
Automation
De-Duplicatio
n
Early Testing
Skills
Communication
Axioms
Artefacts
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Design
Coverage
ValueScope
Prioritisation
Fallibility
Event
Oracle
Never-Finished
Good-EnoughEnvironment
Basis
Repeat-Test
Delivery
Sequencing
Stakeholder
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Sequencing
Stakeholder
What tests do the different stakeholders value most?
What information do the different stakeholders want first?
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Much better than generic ‘maturity models’ that
MUST BE context-dependent
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Who are they?What intelligence do they want?
What do they need it for?When do they want it?
In what format?How often?
Etc.
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RiskManagement
Coverage
Stakeholder
Event
NeverFinished
• Managing Uncertainty• Facilitation, influencing and reporting• Expectation management• Crisis management
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The words software, system, technology,
methodology, v-model, entry/exit criteria, risk – do
not appear
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Testers test software, systems, interfaces,
documents, processes, buildings, people etc…
(Should they apply to testing anything? Discuss!)
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• A procedure for critical evaluation
• A means of determining the presence, quality, or truth of something
• A trial.
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RefinementExamples
Applications
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www.gerrardconsulting.com
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Thank-You!
THE
TESTINGOF