Q: Ti sao con g bng qua ng? qun ti sao lp trnh vin li vit chng
trnh? A: tho mn yu cu ca khch hng.
Q: Chng trnh cn c test, test lm g? A: kim tra xem m do lp trnh
vin to ra c li hay khng.
Q: Lp trnh vin cc bc ch c ci quanh co. Sao khng kim tra thng
xem chng trnh c tho mn nhu cu ca khch hng hay khng? A: , ci gi l
BDD!
3. Phng php pht trin phn mm
thanh ton project, qui trnh lun gm 5 phn: phn tch yu cu, thit
k, vit chng trnh, kim tra, bo tr
Khng nht thit phi theo ng th t + 1 phn c th i qua nhiu ln
Ty cch sp xp cc phn m cho ra phng php pht trin phn mm khc nhau
( cng l i b, nhng sp xp th t bc i theo kiu on D th thnh ra Bt
B?)
4. Waterfall
L phng php pht trin phn mm c truyn, h sch (sch lc default, khng
ngh ra cch g khc th s dng sch ny)
L cch nh tng lc kiu con nh giu, dn hng ngang m cn qut ton b
chin trng
www.relativitycorp.com 5. Agile
L cch nh du kch, tit kim tng vin n, tnh ton tng cn lng thc
Thanh ton tng phn nh ca chin trng
Thanh ton 1 ln cha tha mn yu cu th lp li ->vng xon c
Vng xon c ca Mc: s vt hin tng pht trin theo hnh xon c, n mt lc
no s quay li hnh thc c nhng cp cao hn
6. google: xon c Mc
Dn nhu sau thi gian hin gan v bao t cho ru Ty, bia lon th nay
tm v ru nu, ru ngm, ru dn tc (tc k, b ci, chui ht...)
Gi m n b nhng dm, g quay, vt lut, c hp th tm thng qu. Tr v chi
li d chin bt, ung da, g n my, c ko nng, c lc nng trui
i du lch th chn ch Vng Tu Lt gi ch khoi v qu tt a bt c, hun
chut ng, tm sng hay hi tri cy
7. Agile www.woods-info.co.jp 8. Agile www.rallydev.com 9.
Waterfall VS Agile
Cn ang tranh lun: project ln ( th no l ln?) nn dng waterfall,
nh nn dng agile?
Watefall: bn cht l tnh, kh p ng thay i yu cu ca khch (C project
no m khch khng i ? Project cng ln th cng k hp ng sao cho khng cho
khch i min ph!), ly tht ngi
Agile: v bn cht ng nn khch thch th chiu, ch cn dng team nh nhng
gm tinh binh (senior developer) c responsetiveness (phn ng vi phn
hi t khch) cao
10. Waterfall VS Agile behaviour-driven.org 11. Li ch ca
Agile
Early Return on Investment: thy thnh qu ca project ngay do c vi
ngy li c small release, gim thiu c risk v nu c g sai st th sa c
sm
Increased Control: o c ngay mc hiu qu ca cng vic, thy tin trin
chm th chuyn hng ngay
Responsiveness to Change: team c trang b l thuyt v cng c i ph
vi thay i
12. Agile v offshore
Agile cung cp nhiu mo (practices)
Mo kh dng cho offshore: khch v lp trnh vin ngi chung phng ( gii
quyt phn no bng BSE)
Mo dng c: TDD/BDD, dng nhm nh tinh binh, small automated
integrated release...
13. Agile v test
Test t ng l yu t sng cn ca agile, trong vng xon c lun phi c
test!
L do: c th t tin sa m chng trnh, m bo sau khi thay i nu pht
sinh bug th pht hin v sa c ngay, phi c test t ng!
14. TDD, BDD l g? Cng sn Cuba Trung Quc Vit Nam ... Agile TDD
(Test Driven Development) BDD (Behavior Driven Development) ... tng
(tp hp rt nhiu mo vt) Thc hin c th (thc hin tp hp con cc mo vt) 15.
TDD = BDD
Mt cch cht ch: 2 ci l 1
L design hn l test, test ch l h qu (hiu lm thng gp: TDD = BDD =
test first)
Design process
Requirements Capturing
Behavior Specification
Regression Test Suite
16. TDD = BDD
(1) i vi tng phn ca chng trnh, thay v bp ci coding chi tit
ngay, to khung trc (v d: ch vit tn hm, thn hm b trng)
(2) Vit test cho khung ny mt cch kh y xong
(3) Ri mi p dn dn m vo khung sao cho pass ln lt tt c test
->(1) v (2) c tc dng phn tch yu cu v thit k chng trnh
17. TDD VS BDD
Mt cch thiu cht ch:
BDD = functional test = interface/specification test = li tt c
yu cu ca khch ra th nghim
TDD = unit test = implementation test = li tt c method ca tt c
class (= unit) ra th nghim
Unit test Functional test 18. TDD VS BDD
BDD l cch din t d hiu hn TDD (la li m ni cho va lng nhau): TDD
= assert, BDD = should
TDD = vit test test m chy c ng khng, BDD = vit test (1) nu ra
requirement v (2) test m c thc hin ng requirement khng
(2)
TDD: nhn test thy code ( LTV t sng)
BDD: nhn test thy yu cu (tha mn khch)
TDD = verification, BDD = specification
19. Vn ca TDD
Lp trnh vin cn nhn:
C cht xu m, vit test lm quch g?
Cp qun l cn nhn:
Vit trc thnh ra vit tha, ph thi gian?
->Ngun gc vn :
D gy nhm ln gia test first v test driven, khng ni r mc ch TDD l
design hn l test
Thiu tnh ch dn (intuitive, D th 1)
20. Vn ca TDD
Tnh ch dn:
Bt u t u?
Cn test ci g?
Khng cn test ci g?
Trong 1 test, cn test nhng g?
t tn test l g?
21. BDD gii quyt vn ca TDD
Lm r mc ch: TDD/BDD = spec first (design, documentation), ch
khng phi test first (verification)
Test = specification = kt qu ca phn tch yu cu, nh ngha chng
trnh phi p ng nhng yu cu g ~ thit k
Bao gi cng phi phn tch nhu cu trc -> BDD n mt cch t nhin
ngay t giai on u ca project
C tnh ch dn (hc thc hnh c th s r)
22. Li ch ca BDD
Cc li ch ca Agile
1 pht 2 chim (requirement specification + code verification): c
spec r rng th vit m c ngay, m vit xong khi test (v vit xong
test!)
Nng theo yu cu ca khch vit test, nn khng test tha (nh TDD) hay
thiu
Qui trnh pht trin ( D th 2, level ca cng ty xc nh bi ci ny) hnh
thnh mt cch t nhin, xut pht t nhu cu ( D th 1)
23. Li ch ca BDD Business Q: Are we building the right product?
A: Executable specifications Technology Q: Are we building the
product right? A: Automated tests
