1. Intro.toBDD
(BehaviorDrivenDevelopment)

2. WhatisBDD?
“BDDisasecond-generation,outside-in,pull-based,multiple-stakeholder,multiple-scale,
high-automation,agilemethodology.Itdescribesacycleofinteractionswithwell-defined
outputs,resultinginthedeliveryofworking,testedsoftwarethatmatters.”
--DANNORTH
(CREATOROFJBEHAVETESTFRAMEWORKANDMANYBDDCONCEPTS)

3. WhatisBDD?
“BDDisasecond-generation,outside-in,pull-based,multiple-stakeholder,multiple-scale,
high-automation,agilemethodology.Itdescribesacycleofinteractionswithwell-defined
outputs,resultinginthedeliveryofworking,testedsoftwarethatmatters.”
--DANNORTH
(CREATOROFJBEHAVETESTFRAMEWORKANDMANYBDDCONCEPTS)

4. WhatBDDISNOT?
TESTFRAMEWORK
AUTOMATION
CUCUMBER
“GHERKIN”SYNTAX
TheonlywaytoTest

5. WhatBDDISNOT?
TESTFRAMEWORK
AUTOMATION
CUCUMBER
“GHERKIN”SYNTAX
TheonlywaytoTest

6. BEHAVIORDRIVENDEVELOPMENT
BDDisaboutDEVELOPMENT
NotCODING

7. THEDEVELOPMENTPROCESS
1. Customerwantsafeature.
2. Definethefeature.
3. Buildthefeature.
4. TesttheFeature.

8. TAUTOLOGICALDEFINITIONOFBDD
BDDis
Anagileprocess
ForDescribingBEHAVIORS
ThatDRIVEStheway
SoftwareisDEVELOPED.

9. WT?
It’sawaytowriterequirements
Thatcanbeunderstoodbyeveryone (SEEDOMAINDRIVENDESIGN,byERICEVANS-norelation)
AndExecutedDirectly.
IT’sEXECUTABLEDOCUMENTATION.

10. BDD&TDD
BEHAVIORDRIVENDEVELOPMENT
CamefromTESTDRIVENDEVELOPMENT. (SEEEXTREMEPROGRAMMINGEXPLAINEDbyKENTBECK -alsono
relation)
ITREcognizesthat CommunicatingwithNon-ProgrammersisIMPORTANT
ButthatDOCUMENTATIONcanbecomeoutdated

11. WHYDOBDD
(multiplechoiceQuiz)
A. Managementsaysso.
B. Itmakestestingeasier.
C. TocommunicateBETTER.
D. ALLoftheAbove.

12. TWO(main)STYLESOFBDD
CUCUMBER
GIVEN/WHEN/THEN
MOREDETAILED
MOREORGANIZED
MORERIGID
DOCSINDEPENDENTOFCODE
SPEC
DESCRIBE/ITSHOULD
MORECONCISE
LESSSTRUCTURE
MOREFREEFORM
DOCSGENERATEDBYCODE

13. CUCUMBER
(1of3)Feature:[TITLE]
Asa[ROLE]
Iwant[FEATURE]
SOTHAT[BENEFIT]
Focusonthereasonfordevelopingafeature.

14. CUCUMBER
(2of3)SCENARIO:[DESCRIPTION]
GIVEN[INITIALCONTEXT]
WHEN[ACTION]
THEN[EXPECTEDRESULT]
Describeeachscenariowithpreconditions,steps,andexpectedresults.

15. CUCUMBER
(3of3)EXAMPLES:
Provideconcreteexamples.
USER PASSWORD COMMAND MESSAGE
aaron SECRET Openpodbaydoors ACCESSDENIED
dave DAISY Openpodbaydoors I’mSORRYDAVE,I’mafraidIcan’tdothat

16. SPEC(RSPEC,MOCHA)
DESCRIBE([FEATURE])
It([BEHAVIOR])
...implementation
Documentation&implementationlivetogether

17. WHENTOUSECUCUMBER/GHERKIN
Typicallyusedforuserstorieswhereproductownerisinvolved
andshouldwrite,(oratleastapproveof),theSPEC.
Thespecisamechanism forcommunication,notawaytodictatefeatures.

18. WHENTOUSEMOCHA/RSPEC
Typicallyusedfordeveloperorientedtests.
DOcumentationisgeneratedfromcode.
Goodforreportingcoverage,butnotsomuchforcollaboration.
Thespecisusedprimarily forgenerating DOCUMENTATION.

19. THEEND
Thanks.
Aaron.evans@hart.com
https://linkedin.com/in/aaronevans
@fijiaaron