Pragmatic Test Driven Development. Практика.

Intro
Ìîòèâàöèîííàÿ
Âíåäðåíèå
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Pragmatic Test Driven Development. Ïðàêòèêà

Âëàä 'mend0za' Øàõîâ
Linux and Embedded department
SaM Solutions

March 2012

SaM Solutions: Linux and Embedded department Pragmatic Test Driven Development. Ïðàêòèêà

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Outline: Êðàòêîå ñîäåðæàíèå è òåìû

þíèò-òåñòèðîâàíèå

ôóíêöèîíàëüíîå òåñòèðîâàíèå

çàïóñê òåñòîâ è ïðîâåðêà ðåçóëüòàòîâ

êîíòðîëü ïîêðûòèÿ òåñòàìè êîäà

óòèëèòû è áèáëèîòåêè (Free Software)

íà ïðèìåðå 2õ ðåàëüíûõ embedded ïðîåêòîâ

äëÿ ÿçûêà ïðîãðàììèðîâàíèÿ Ñè


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À íàäî ëè âîîáùå òåñòèðîâàòü?

Çà÷åì êîçå áàÿí TDD ?


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Ïðè÷èíû ïî÷åìó ÄÀ

òåñòèðóåò ñàì ðàçðàáîò÷èê
ýòî òîæå ïðîãðàììèðîâàíèå


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ñîîòâåñòâèå òðåáîâàíèÿì

ãàðàíòèÿ, ÷òî âàø êîä äåëàåò âñ¼ êàê íàäî


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êîíòðîëü êîððåêòíîñòè èçìåíåíèé
èñïðàâëåíèÿ ëåãêî ïðîâåðèòü ïðîñòî çàïóñòèâ òåñòû


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ìåíåäæåðü¼ è çàêàç÷èêè ëþáÿò êðàñèâûå öèôðû

TDD äàñò öèôðû äëÿ îò÷¼òà


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ìåíåäæåðü¼ è çàêàç÷èêè ëþáÿò êðàñèâûå öèôðû

TDD äàñò öèôðû äëÿ îò÷¼òà

èòîãî

êà÷åñòâî è óïðàâëÿåìîñòü ðàçðàáîòêè óëó÷øèòñÿ


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Âíåäðåíèå. Ïðîñòûå ðåöåïòû

Òåñòû áåç ïðîâåðêè ïîêðûòèÿ - áåñïîëåçíû

Sad but true
a

a
Metallica c 1993 Sad but true single


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Sad but true
a

a

Ìàëåíüêèé ïðîåêò - ïðîñòûå ïðîöåññû


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Sad but true
a

a


Áîëüøîé ïðîåêò - ãåìîððîéíûå èíñòðóìåíòû
R R
Rational Purify íàïðèìåð


Intro
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Sad but true
a

a


Áîëüøîé ïðîåêò - ãåìîððîéíûå èíñòðóìåíòû
R R
Rational Purify íàïðèìåð

Ôèçèêà
çàêîíû ìàêðîìèðà è ìèêðîìèðà îòëè÷àþòñÿ

êîðåííûì îáðàçîì


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Ñáîðî÷íàÿ ñèñòåìà

1 Äîáàâëÿåì êîìïèëÿöèþ òåñòîâ â ñáîðêó
2 Âêëþ÷àåì ïîäñ÷¼ò ïîêðûòèÿ gcov :
CFLAGS+= - -coverage

1 CFLAGS += −DDEBUG (DEBUG) −g −− c o v e r a g e
=$

BINARY_TEST = unit_test

3 OBJ_TEST = test / test . o source / fts_binsearchtree . o

5 $ (BINARY_TEST) : $ ( OBJ) $ (OBJ_TEST)

$ (CC) $ (CFLAGS) $ (LDFLAGS) −o $@ $^ / usr / l i b /

libcheck . a

7

check : $ (BINARY_TEST) $ (CONFIG_SPACE_PATH)

9 . / $ (BINARY_TEST) $ (CONFIG_SPACE_PATH)

[


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Êàê ðàçðàáàòûâàåì 1: êîä è òåñòû

test/test.c

1 START_TEST( c o n f i g _ s p a c e _ c h e c k _ t e s t )

{

3 int ret = c o n f i g _ s p a c e _ c h e c k ( nvram_basedir ,

BMCInst ) ;

fail_if ( ret != −1 , config_space_check ( ) must

return −1 ) ;
5 }

END_TEST


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Êàê ðàçðàáàòûâàåì 2: êîìïèëÿöèÿ è çàïóñê

test/test.c

$ make check
96%: Checks: 27, Failures: 1, Errors: 0
test/test.c:54:F:Cong Space:test_init:0: path should not open
test/test.c:1524:P:Cong Space:cong_space_check_test:0: Passed
test/test.c:1561:P:Cong Space:string_with_zero_test:0: Passed
test/test.c:1595:P:Cong Space:migration_test:0: Passed


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Êàê ðàçðàáàòûâàåì 3: ïðîâåðêà ïîêðûòèÿ

ïðîâåðêà ïîêðûòèÿ

ãäå îòðàáîòàëè, ãäå íå âîøëè + ñòàòèñòèêà


Intro
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Êàê ðàçðàáàòûâàåì 3: ïðîâåðêà ïîêðûòèÿ

ïðîâåðêà ïîêðûòèÿ

ãäå îòðàáîòàëè, ãäå íå âîøëè + ñòàòèñòèêà

ggcov


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Ïðèìåð 1. Áèáëèîòåêà ñ âíåøíèì API

Ïðîåêò: ïðîøèâêà BMC ñåðâåðîâ Fujitsu Primergy

Íàçíà÷åíèå: óïðàâëåíèå ïåðåìåííûìè äëÿ IPMI-ñòåêà

Ðîëü TDD: òîëüêî Unit-òåñòèðîâàíèå

Èíñòðóìåíû è ëèáû TDD: check, gcc/gcov, ggcov


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Ïðèìåð 2. Óïðàâëÿþùåå ÏÎ ïðîøèâêè

Ïðîåêò: 4-õ êàíàëüíûé âèäåîðåãèñòðàòîð

Íàçíà÷åíèå: óïðàâëÿþùåå ÏÎ â user-space

Ðîëü TDD: Unit Testing, Functional Testing,
Integration Testing, ýìóëÿöèÿ îáîðóäîâàíèÿ

Èíñòðóìåíû è ëèáû TDD: cunit, make,
gcc/gcov, ggcov, Linux Kernel


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èíñòðóìåíòû

Unit-test frameworks
1. check - http://check.sourceforge.net
2. cunit - http://cunit.sourceforge.net

Coverage tools
3. Ðàñøèðåíèå gcov - âñòðîåíî â GCC (- -coverage)
4. ggcov tool - http://ggcov.sourceforge.net

Âåñü èíñòðóìåíòàðèé - äîñòóïåí â äèñòðèáóòèâàõ, ïîä
ñâîáîäíûìè ëèöåíçèÿìè


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Âàøè âîïðîñû

www: http://www.sam-solutions.com

email: v.shakhov@sam-solutions.net

jabber: mend0za@jabber.org.by


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