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L `4    0  A ?1 ?L   B  @  fDԔ?      f;1?"`0 i  TPointcut H  0޽h ? fԇl___PPT10i._0+D=' = @B +t  `  (    3 rA ?1?0 #Y x  c $(FL    ~  s *FL    0  A ?1 ?L   B @  fDԔ? @ B  @  fDԔ? p    fJ1?"` P   U Pointcuts  H  0޽h ? fԇl___PPT10i._0+D=' = @B +y  0(  x  c $UL    x  c $hVL  H  0޽h ? fԇly___PPT10Y+D=' = @B +y  0(  x  c $dL    x  c $eL  H  0޽h ? fԇly___PPT10Y+D=' = @B +y   0(  x  c $rL    x  c $sL  H  0޽h ? fԇly___PPT10Y+D=' = @B +y  0(  x  c $P@0   x  c $ЉP `   H  0޽h ? fԇly___PPT10Y+D=' = @B + 0 P@&(  @X @ C     @ S Z @   (H @ 0޽h ? ̙33I 0 KC0L(  L^ L S    = L c $ֵ @   _In our approach, we assume that a system specification consists of a set of individual functional requirements where each individual requirement describes a partial functional behavior of the system. An individual requirement consists of a requirement ID, a textual description of the functional behavior and the corresponding description in a formal specification language. These two descriptions are equivalent. This dual-format description of individual requirements allows for better understanding of requirements by system developers, testers, managers, etc. The practice of using textual and SDL descriptions of individual requirements is quite commonly used in the industry, especially in the telecommunication and computer networking fields. Our approach uses the SDL as a formal specification language for specifying individual system requirements. V_  3  ) H L 0޽h ? ̙33hJ 0 ( PT(  T^ T S     T c $ @   hA sample of individual requirements of an ATM system described in the dual-format is shown in Figure 9. *hh H T 0޽h ? ̙33hK 0 ( d(  d^ d S     d c $ @   hA sample of individual requirements of an ATM system described in the dual-format is shown in Figure 9. *hh H d 0޽h ? ̙331M 0 p(  p^ p S      p c $\ @   w  An EFSM system model becomes an input to a model-based test generator. The generator may support a variety of the existing EFSM model-based test generation strategies [Che93, Wan93]: state coverage, transition coverage, path coverage, etc. Depending on the selected testing strategy, the test generator automatically generates a set of paths (from an initial state to the final state) in the EFSM model that satisfies the selected strategy. For each path, appropriate test values (inputs) that lead to the traversal of the selected path are identified. Note that typically a path corresponds to a test case in the test suite. The major goal of these testing strategies is to test the whole system. In what follows, we briefly describe commonly used testing strategies related to the EFSM models: State coverage: Each state in the model is traversed at least once. Transition coverage: Each transition in the model is traversed at least once. Note that in order to test all requirements it is sufficient to generate a set of test cases that satisfy this strategy. Path coverage: Each path in the model is traversed at least once. The goal of the transition coverage is to test individual transitions whereas the goal of the path coverage is to test all possible interactions between transitions. Path coverage may generate an unacceptable number of paths especially in the presence of cycles in the model. For this reason this technique is not frequently used [Het88]. Constrained path coverage: Each path in the model is traversed at least once under the constraint that each transition is traversed at most n-times. This is a modified version of the path coverage. It addresses the problem of large number of test cases generated by the path coverage by limiting the number of times each transition can be traversed. As a result, a significantly smaller number of paths (tests) are generated depending on the value of n. Data flow coverage is a family of coverage criteria (e.g., c-use, p-use, all-use, etc.) that generates paths through the system to explore sequence of events related to the exchange of data [Bou01, Fra88, Fra93, Har88, Off96, Rap85]. Data flow coverage is an extension of the existing data flow testing techniques [Rap85] to model-based testing. In our approach, each generated test case (a path) is mapped to individual requirements, features, and requirement classes, i.e., a set of requirements is associated with each test case. This set is a union of requirement IDs labeled on all elements of the path (states, transitions). Similarly, a set of features may be associated with each test case (path). This information may be useful during debugging. If a test fails, developers may use this information to better understand which requirements and features were involved in the failed test. This is not supported by the existing test generation methods because no mapping between an EFSM model and individual requirements is available.    1 !  6 !  !   !     !  #      _   H p 0޽h ? ̙33whx] \۞).NLo$ ޒ[m8*րG#^F+ƫZbk6 *J&!(~&hNJ~<ww;;3{(qe!2jYJciO7M$I*i@ o13QSPsO$SR%K#PT_Sқ֭OjfY;ͦ`ilđQMDt:!M t2]+l d9@`'-=nuvvz@}==}}m B "S   Q`(0 Qm 1q w%p`0'cqx +&ST{"S;N&6  zl\<| f,?uF8ߨOu]KuG Q}iB&@c[&_Bz]r0 \\\\ |(fW?nnnnnnnfw?ww?~ T)Y=<x4 ,PL>*xxxxx x9 _~ T x :g/5) `xo%@ 7?Z7˓X|| VP@M+\Rzo^͘U|.yxrCpj&^51MP n"SÞMM*(ǚuZ1p%xkίhkZRwC 89q}^o ʏ}}[SOtl? +`h[7 ;PG1+x֌lW*1d͘g]1Ө1i<z{Ro/vAwgJwz, E[:9rhW9(;L-uS*i 0Իde1 " E¢e9M ^XKR\(RPtiu96qY^v]\C4T.7,gF5F(RPeט,~qY^f#d{Fʅ ƴ]EcC4T.X51:=[NKT.ӏ@?jLY\ZRrؘ~tыb]KT.ӏNC?juewǒ" Џs]ޱHB14\Vw,)RPlL?ѻեeyזheGʅbceغ8HBeyY{εoeGʅbcQcltˮE*G) Vv\(6,/ѻZQr~9',Y\(6,/.k]Y\(لZ]x%{=|p2o+Zx*.Kpĉ^ziR{2#R`,P2o煀+ Pzf,k2Xƚd,njZ4Y}ef,@6 oj˄KcFycLP˄z6pSRqYYY]v~7v=\`0LV;e/m_p5pu p8f] (J|ʋdMz&{d׈^]@u x>xVa^Ǝ[wʋ6&ԁ&{]hۅ&{]{ 6 (z7b={(4g o&v^o^2n({u@.7.yDmsfwb(X9C(X{麽A 6 '6.TO` 9sr_|x/ Ƭi/'3 uh~UnM nWdD0{7O>< 8;?z_@8f^m!gprriee{ѱ]tׯߋ~}8z%Ki/0V3fE4EfѣGYp/Ya ׼9cǎՑUtkf/ͷE6 =l34٫h^<49j];04#K{AјxQᤍ\AAA/*6Yֈx^N4jWj^)^&1_bEb_kƌsbxаͪlVG/:֬f02ٹmΜ9/*zٷojf/611EUc2c2͛i/34FzhVǺ\7rsM2CU{l/`l^x /tuly4fCj̓*vV n l ft}%m|X&{5M;^uoL]|E_f^" d ox|42Û?jWm4/d/34^fլ^/zN}GnݺKwػwoFP7wgijM *>}zpIwGa'tppxYD~~~>>>/U{xnOوg#YAfzh|K QdmU^==Dp\k׮,4g07ĉ' jk}"g1uoCd Wqqqm߯$EqWs#h̝_`HJ~k7l*ϋFl機hpcx˵?rJxp77dh_n6ث_~: QN#g*O7^ƍ}'ﳵi&%%:|klAެ~ Ԩ7`Ve؄l5OH{ml?d&{d/34٫a92wΪp ^GpWom#gcQ\9q}_?.>ulWd MzG@cu\w΍}Ynm:]VwfLjMM|x&{^&{^ W˖-o& ƿ]v{~//_6CsM2Cnoԍ 3 3޿@o/E.4B.doX=)?"V\|'/ {|t ~~cϞ=uo@#縸?\GpR}s3}sa񆏿e&{%e٫K.<`x_^ի׳͗Ryt:f@_ͪlVǺO1rm7^ׯ__E>yw^'|Rǯfkoױc٬fu|_fUmro_6Ûfh0لm7f2sYa7l~2 V`YG{)>|Xw΍J#:ށz)^}t}a6W&9hۅ&{]xfS66lX?kfuaeP}]???p;**M6k !O8a .'Do>.=+]p M_e4٢^fucMf6}3MVX&d_ 4_NDi&{X&d/מ={L43 èb r_#dfPյ13'P6p̞T1}K?UR{>cϞjhHs1}|O(>Rz^j3`iS^&{h34˄&{Fmv7?oND %y>Ex_^׍Kw?`/P1X,Œ:er B]/.DRP*(3DHsF(77ݽ{D| :zmڴIIhĈGヨ͹/U#Ku+X{ex }EQE3CEC BZɤ4@?~H}u*6B(M5U &鏋X Ş)M@;A)ɰDϹg'liP +4Fvϰ*FGjhqF7X.>vϐVʮX>nUFGCP^q7=E wf05: R 5:6vݚ n.Mag!E$YL;#DΛ nEtr%ƤuwϢ pf9uwwIeCYHƜl1rb},cӌ:TŘls`uq~V,{X0!Vü.Ʌ}Ws;ht:o[ h)iEew^ ڝk;Yse,*:Oҭ;m1ɫ|٧[$x[l97?nsys8!Ν!VU_XE~I#/Q^ߨbI`{ ~8k}™s{ 6>VQE2/fo`gUNV#wt Z:yi=FӬ\/-al~FDpZLI2S;WKŤ>'$b醥 }4Ob4:Si'%."DHJ|TDB,N)MMIDƨSf$Vb8丈(>$`H&ǓNTjvzL4.:>&F$pĘn݌AAYr* v9_&ժ@Ȱr+H uFҔY[R=agT[i}!FqNJ{- RW=23Ic2梊_E„ 'tJ&B'dk([Jsɤ*aڌaOWގ!*Q-v隉-Y4ÎljpF\GΙ#5u cBPD6u45BxfbV43-\mD!D7m&0hӬ?`}C-WbпufL_YN܀Y#¾W; [ 5vy+$1s+,qmseR&.}s\nNJwdqV_ch[]9eb>)0ـN!&x;56{J= hgK-1nA`{f-hiӆ\FAlksmalCr{q斕wIP ̞P6$@/ Q ~LZ Mnu?Vo^xl/dN [2V`(̑?ͰOO>9WɎC? 阰@^*mCV-(~#þM1̝d :!8ӺUu&-Ѫ$ 7[ӻgOT=đE Sg%œq)Q87猈"I)R4UOJq8'9I11dnzo+?6C-gc#:_`cXюj{9kwoY-crxLI% h@w$4.`̵.ѯ|}3U į*و! ."16C3b"u939cDZh:sڀvGGx.͙]G0e;c@f KζGڙ+DkHIHL Gц$E5<>QVU?ܖƔ$iB2m,['S(mK)Kǥ= Z^m=anZmaOU|˪LެDD.jZyi }cfNڏFO!RG&YƠjy-ۀ b6)ɞ?I_] @GE?9#@oO;-`!+@'#!{WGXcb2X48󋢊֙5]}9Ǽ{]ܶn %zr8S쐌t(i"itI^ZJA d,$JdJo&JZMzR*[5=MtJdv|b|bl񮼠dWDr4*^9WR'e'&;2}1 ~] JS&@( }1!L3‰HWLMdc],Nt8x'gqcuR29:!wJdQ==8j:@يrVnN}=# vU5itm:agK96z2&ֵ ۫ZCp=2iTU!؃b{ f 4gN\e2Q>)xgbh0 XWD,zkg&3YCYÓY,lwڡfӆ#1V\! jLjQvSdT:Qu15 dHdс=zPDTGwgTh#:ui8@YT 5t a=X "j'o̊A@&FOf I߸v߁ #6:?]c]|ƟתGo sNЗI9]fs VccTO˄c_\:}cQ}}X:Xk xhծqv'sNXn*to>s:'2R ;.nd́1%$2$~o/IIteUŁˏCȖW㛬*ciVdg[>U>)߱'9${j} f$GB'"bE&S+*Ui=WL&"=ǫz͜9^qS#㣪NkR)<+9%F=%+:i^Qmy"o=UM.8 !jBڕ~{RР Eٿeu`5ʕX:>2ޕz*UVbG(< )E_Q.ta2)ٝ kqt3mSбQ#'j3@]P ^mKpȩyWjTWo=ș4ĵ'{3cc{5;9&';[it=QD.kAl6ahF>A a[; 䲥|=-Cz&IU$&[X?h?1gC3qjB }O> _uNJF$42Fie&yָ@I4C2Aɘh$d6wxШee*8$bY5,cWTU`OآQj#e=vv%!>^ z j)35aRZfF-g4?&-D}5|T\ifP+6x[4cdMKdM cRS-%knuS$1I242&i$#=zbo+ZL .cb ؖR5R|J<$|Vkx\JlkA)%tS5RTW8ɤijMRlTF).wIk6W2@ǥإ )ۙ$wS>A>ՙ Ja%-Gn6C㢯zi;\,#y҉/9 ['m~ڼ$J zeX!eKǕˤpjs +Xdl~[&DIvb3)nQ+Y-}z!G^+z$!elҫFepgdt`+Ez)bdSMRM)iT$;q!(ʤE ٽU:b;STKSk;knqFY#XSy&Gs+06-d+W"y6 WbAa ԮZd@ۧv`x1'Nsy;ךTkJt iʧ\44W5i7/$ T@ N!n҃ܰ]1IȆfW3$||$YW tt%БVrbRFK3ȥh$*. 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