テスト駆動開発の過去・現在・未来 / History of TDD - XPJUG 2018 Keynote

ςετۦಈ։ൃ ςετۦಈ։ൃ աڈɾݱࡏɾະདྷ ͷ ࿨ా୎ਓ 4FQ !91ࡇΓجௐߨԋ

࿨ా୎ਓ UXBEB U@XBEB UXBEB

؂मɺ؂༁ɺ຋༁ͨ͠ຊͨͪ

最近の立ち位置 ελϯυ໊ϫΠϧυɾαόϯφ

assert(typeof item.id === 'strong') | | | | | |
| false | | "foo" | Item{id:"foo",name:"bar"} "string" --- [string] 'strong' +++ [string] typeof item.id @@ -1,6 +1,6 @@ str -o +i ng 代表作は power-assert IUUQTHJUIVCDPNQPXFSBTTFSUKTQPXFSBTTFSU

ΑΖ͓͘͠ئ͍͠·͢

IUUQTUXJUUFSDPNYQKVHTUBUVT

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Kent Beck IUUQTXXXBNB[PODPKQEQ

→ 2003 2017 ઈ൛ͱ৽༁ʹΑΔ෮ץ

2007 2008 2009 2010 2002 2003 2004 2005 2006 2011
2012 2013 2014 ෇࿥$ͷλΠϜϥΠϯ࡭ͱਓ

େաڈ 5%%ͷ஀ੜ·Ͱ

2007 2008 2009 2010 2002 2003 2004 2005 2006 2011
2012 2013 2014 ෇࿥$ͷλΠϜϥΠϯ5%%CZ&YBNQMF΁ͷಓͷΓ

5%%͕ੜ·ΕΔ·Ͱ ,FOU#FDL 8BSE$VOOJOHIBN 3PO+F⒎SJFT &SJDI(BNNB

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+6OJUαΠτެ։ɺʮ5FTU*OGFDUFEʯ ࣥච࣌ʹ5FTU'JSTU1SPHSBNNJOH͔Β  5FTU%SJWFO%FWFMPQNFOU΁ 5%%͕ੜ·ΕΔ·Ͱ

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աڈ 5%%ͷ஀ੜޙ ͔Βݱࡏ·Ͱ

2007 2008 2009 2010 2002 2003 2004 2005 2006 2011
2012 2013 2014 ෇࿥$ͷλΠϜϥΠϯY651

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Y651ύλϯϥϯήʔδͱͯ͠ͷςετ

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2007 2008 2009 2010 2002 2003 2004 2005 2006 2011
2012 2013 2014 ෇࿥$ͷλΠϜϥΠϯ(004

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ʰ(SPXJOH0CKFDU0SJFOUFE4PGUXBSF (VJEFE  CZ5FTUTʱग़൛

l.PDLzͷ஀ੜ

public void testUpdateEmployee() throws SQLException { MockStatement nameStatement = new
MockStatement(); MockStatement detailsStatement = new MockStatement(); MockConnection connection = new MockConnection(); nameStatement.setExpectedUpdate(NAME_SQL); detailsStatement.setExpectedUpdate(DETAILS_SQL); connection.setExpectedCommitCalls(1); myEmployee.updateNameAndDetails(connection, nameStatement, detailsStatement); connection.verify(); nameStatement.verify(); detailsStatement.verify(); } l.PDLzͷ஀ੜ

෼཭ͱΠϯλϥΫγϣϯΛΑΓҙࣝͨ͠ઃܭ΁ͱಋ͔ΕΔ

ʰ(SPXJOH0CKFDU0SJFOUFE4PGUXBSF (VJEFECZ5FTUTʱग़൛ ˞l(004zͱݺ͹Εɺ  5%%ͷ࡭໨ͷόΠϒϧͱͳΔ

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μϒϧϧʔϓͷߏங

ಉ৺ԁঢ়ͷΞʔΩςΫνϟͷ໛ࡧ ಉ৺ԁঢ়ͷΞʔΩςΫνϟͷ໛ࡧ͸͜ͷͱ͖ طʹ"MJTUBJS$PDLCVSO΍-POEPO4DIPPM ͷ໘ʑʹΑͬͯ࢝·͍ͬͯͨ

౰࣌ɺ·ͩະ։ൃͰະ஌ͷ෦෼ʹґଘͨ͠··Ͱ"5%%Λ ࣮ફ͢Δʹ͸ٕज़తͳ೉͕͋ͬͨ͠͞ͷͰ͕͢ɺ(004͸ ϞοΫΦϒδΣΫτͷ׆༻Ͱͦ͜ʹಥഁޱΛݟ͍ͩͨ͠ܗ ʹͳΓ·ͨ͠ɻ (004͸5FTU%SJWFO%FWFMPQNFOUCZ&YBNQMFΑΓ ΋આ໌ͷεέʔϧΛ޿͛ɺ࣮ࡍͷΞϓϦέʔγϣϯ։ൃʹ ͓͍ͯ΋ςετۦಈ։ൃͷख๏͸༗ޮͰ͋Δ͜ͱΛࣔ͠ɺ ޙͷ#%%ʹͭͳ͕ΔྲྀΕΛܗ࡞Γ·ͨ͠ɻ ᴷ࿨ా୎ਓ ʰςετۦಈ։ൃʱʮ෇࿥$ʯ

5%%ͷ5͸ ʮςετʯͳͷͩΖ͏͔

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ςετͱ͸ɼΤϥʔΛΈͭ ͚Δͭ΋ΓͰϓϩάϥϜΛ ࣮ߦ͢ΔաఔͰ͋Δɻ ᴷ(MFOGPSE+.ZFST ʰιϑτ΢ΣΞɾςετͷٕ๏ʱQ

ςετۦಈ։ൃͷςετ͸ɺιϑτ΢ΣΞςετͷੈքͷʮςετʯ ͷதͰ͸Ұ෦Λ઎ΊΔ͚ͩʹա͗·ͤΜɻʹ΋͔͔ΘΒͣɺςετ ۦಈ։ൃΛաେධՁ͢Δਓ΍ɺ໊લ͔Βड͚ΔΠϝʔδΛͦͷ·· ड͚औͬͯ͠·͏ਓͳͲ͔Βʮςετۦಈ։ൃΛߦ͏͔Βόά͸θ ϩʹͳΔʯʮςετۦಈ։ൃΛߦ͏͔ΒςετΤϯδχΞ͸ෆཁʯ ͱ͍ͬͨޡͬͨҙݟ͕ฉ͔ΕΔΑ͏ʹͳ͖ͬͯ·ͨ͠ɻ ςετۦಈ։ൃͷςετ͸ɺຊ౰ʹςετͩΖ͏͔ɻςετͰ͸ͳ ͍ͱͨ͠ΒɺͦΕ͸ԿͩΖ͏͔ɻͱ͍͏໰͍͕ݱ࣮ͷ໰୊ͱͯ͠ݱ Ε͖ͯ·ͨ͠ɻ ᴷ࿨ా୎ਓ
ʰςετۦಈ։ൃʱʮ෇࿥$ʯ

2007 2008 2009 2010 2002 2003 2004 2005 2006 2011
2012 2013 2014 ෇࿥$ͷλΠϜϥΠϯ"HJMF5FTUJOH

5%%ͷ5͸ ʮςετʯͷҰ෦ʹ ա͗ͳ͍ "HJMF5FTUJOH

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ݱࡏςετࣗಈԽϐϥϛουͱΞΠεΫϦʔϜίʔϯΞϯνύλʔϯ IUUQTXBUJSNFMPOCMPHJOUSPEVDJOHUIFTPGUXBSFUFTUJOHJDFDSFBNDPOF

ʰ"HJMF5FTUJOHʱग़൛

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5%%ͷ5͸ʮςετʯͷҰ෦ʹա͗ͳ͍ ʰςετۦಈ։ൃʱʮ෇࿥$ʯQΑΓ

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2007 2008 2009 2010 2002 2003 2004 2005 2006 2011
2012 2013 2014 ෇࿥$ͷλΠϜϥΠϯ#%%

ΑΓ;͞Θ໊͍͠લΛٻΊͯ 5%%͔Β#%%΁

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public class FooTest extends TestCase { public void testIsASingleton() {}
public void testAReallyLongNameIsAGoodThing() {} } Foo - is a singleton - a really long name is a good thing 5FTU%PY"HJMF%PY CZ$ISJT4UFWFOTPO IUUQBHJMFEPYTPVSDFGPSHFOFU ςετίʔυ͔ΒυΩϡϝϯτੜ੒

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IUUQEIBUFOBOFKQEJHJUBMTPVM 5FTU%PY"HJMF%PY CZ$ISJT4UFWFOTPO

IUUQTKCFIBWFPSHIUUQEIBUFOBOFKQEJHJUBMTPVM public class StackBehavior { public void shouldPopValuesInReverseOrder() throws Exception
{ stStack.push("test 1"); stStack.push("test 2"); Ensure.that(stStack.pop(), m.is("test 2")); Ensure.that(stStack.pop(), m.is("test 1")); } public void shouldLeaveValueOnStackAfterPeek() throws Exception { stStack.push("test 1"); stStack.push("test 2"); Ensure.that(stStack.peek(), m.is("test 2")); Ensure.that(stStack.pop(), m.is("test 2")); } } +#FIBWF։ൃ։࢝ CZ%BO/PSUI ˞ཌ೥ϦϦʔε lςετϝιου͸ʮTIPVMEʯͱ͍͏୯ޠͰ࢝Ίͳ͚Ε͹ͳΒͳ͍ͱ͍͏ ن໿͕ු͔ͼ·ͨ͠ɻ͜ͷจষςϯϓϨʔτɺ͢ͳΘͪͦͷΫϥε͕Կ ͔Λ͢Δ΂͖ͩͱ͍͏จষςϯϓϨʔτ͕ҙຯ͍ͯ͠Δͷ͸ɺݱࡏର৅ͱ ͳ͍ͬͯΔΫϥεʹର͢Δςετ͔͠ఆٛͰ͖ͳ͍ͱ͍͏͜ͱͰ͢z

ࢲ͕5%%ʹର๊͍͍ͯͯ͠Δ໰୊ͱ͸ɺ5%%ͷϚΠϯυηοτ͕զʑΛຊདྷͱ ͸ҟͳΔํ޲ੑɺͭ·Γؒҧͬͨํ޲ੑ΁ͱಋ͍ͯ͠·͏ͱ͍͏͜ͱͩɻզʑ ͸ϏϔΠϏΞΛ࢓༷Խ͢Δ༻ޠΛ࢖ͬͯߟ͑࢝ΊΔඞཁ͕͋ΔɻςετʹΑΔݕ ূͷ༻ޠͰ͸ͳ͘ɻ ϏϔΠϏΞ࢓༷ͷ༻ޠͰߟ͑Δ͜ͱͰɺͦΕͧΕͷϏϔΠϏΞʹ͍ͭͯΑΓ໌֬ ʹߟ͑ΔΑ͏ʹͳΔɻΫϥεຖ΍ϝιουຖͷςετͱ͍͏ߟ͑ํʹཔΒͳ͘ ͳΓɺΑΓ༏Ε࣮ͨߦՄೳͳυΩϡϝϯτΛखʹ͢Δ͜ͱ͕Ͱ͖ΔΑ͏ʹͳΔɻ 5%%͸5%%Ͱ͋Γɺ୭΋ͦͷ໊લͷҙຯΛม͑Α͏ͱ͸͠ͳ͍ ͦΕΛظ଴͢΂ ͖Ͱ͸ͳ͍͠ɺͦ͏ͯ͠΋Β͍͍ͨΘ͚Ͱ΋ͳ͍
ɻ৽͍͠΍Γํʹ͸৽໊͍͠ લ͕ඞཁͩɻ͜Εʹ͸%BO/PSUI͕ߟ͑ͯ͘Ε໊ͨલ͕͋ΔʜʜͦΕ͕#%%ɺ ϏϔΠϏΞۦಈ։ൃͩɻ ʮ#%%"OFXMPPLBUUFTUESJWFOEFWFMPQNFOUʯ CZ%BWF"TUFMT IUUQHJBOUFDIKQQBHFTJLJUFNB#%%*OUSPIUNM

describe Stack, " (empty)" do before(:each) do @stack = Stack.new
end it { @stack.should be_empty } it { @stack.should_not be_full } it "should add to the top when sent #push" do @stack.push "newly added top item" @stack.peek.should == "newly added top item" end end 34QFD։ൃ։࢝

.-্Ͱͷ࿦ઓ 4UFWFO#BLFSͱ,FOU#FDL

ʮ*OUSPEVDJOH#%%ʯ CZ%BO/PSUI IUUQEIBUFOBOFKQEJHJUBMTPVM

IUUQTDVDVNCFSJP Feature: <some terse yet descriptive text of what is
desired> As a <role> I want <feature> So that <business value> Scenario: <some determinable business situation> Given <some precondition> And <some other precondition> When <some action by the actor> And <some other action> Then <some testable outcome is achieved> And <something else we can check happens too> $VDVNCFS͕34QFD͔Βಠཱ

#language: ja フィーチャ: ログインしてユーザを識別できるユーザとして、ログイン機能などで自分の情報を識別したい。なぜなら、メッセージなどを「自分のもの」として区別したいからだ。シナリオ: ユーザ登録してログインする前提"新規ユーザ登録"ページを表示している
もし"ログイン名"に"moro"と入力するかつ"E メール"に"[email protected]"と入力するかつ"作成"ボタンをクリックするならば"こんにちは moro さん"と表示されていること $VDVNCFS͕34QFD͔Βಠཱ IUUQTUBUTV[JOFDPNCPPLTDVLF

ʰ#SJEHJOHUIF$PNNVOJDBUJPO(BQʱɺʰ4QFDJpDBUJPOCZ&YBNQMFʱग़൛

ʰ5IF4QFD#PPLʱʰ5IF$VDVNCFS#PPLʱग़൛

34QFD͸ɺ౰࣌രൃతʹྲྀߦ͍ͯͨ͠΢ΣϒΞϓϦέʔγϣ ϯϑϨʔϜϫʔΫ3VCZPO3BJMTͷςετͷ࢓૊Έͱͯ͠σ ϑΝΫτελϯμʔυͷ஍ҐΛ֫ಘ͠ɺ3VCZͷςεςΟϯά ϑϨʔϜϫʔΫʹ͓͍ͯѹ౗తͳγΣΞΛ֫ಘ͠·ͨ͠ɻ ͜ͷ34QFDͷେ੒ޭʹΑͬͯY4QFDܥͷߏ଄ͱޠኮ͸ଞͷݴ ޠ΁Ҡ২͞Ε࢝Ί·͢ɻ͔͜͜Β਺೥͸34QFDͱ$VDVNCFS ͕ଞͷݴޠʹҠ২͞Εͭͭɺ5%%#%%ͷγʔϯΛϦʔυ͢Δ ͜ͱʹͳΓ·͢ɻ ᴷ࿨ా୎ਓ ʰςετۦಈ։ൃʱʮ෇࿥$ʯ

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ݱࡏ 5%%ͷ͍·

2007 2008 2009 2010 2002 2003 2004 2005 2006 2011
2012 2013 2014 ෇࿥$ͷλΠϜϥΠϯ%))

ຊॻʰςετۦಈ։ൃʱͰॻ͔Ε͍ͯΔΑ͏ͳຊདྷͷ5%% ͸ɺϓϩάϥϚ͕ࣗ෼ࣗ਎Ͱෆ҆Λ੍ޚ͢ΔͨΊͷิॿ ྠͷΑ͏ͳ໾ׂΛՌͨ͢খ͞ͳϓϥΫςΟεͰͨ͠ɻ ͔͠͠5%%͕ࢧ࣋͞Εɺ࣮ફऀ͕૿͑ɺͦΕҎ্ʹ࣮ફ ͯ͠Έ͍ͨਓ͕૿͑ɺ5%%ࣗ਎͕(004΍#%%Λܦ֦ͯ େ͍ͯ͘͠ʹͭΕͯɺͦ͜ʹ͸ͭͷɺҟͳΔํ޲Λ޲͘ มԽ͕๚Ε·ͨ͠ɻڭ৚ओٛԽͱɺҙຯͷرബԽͰ͢ɻ ᴷ࿨ా୎ਓ ʰςετۦಈ։ൃʱʮ෇࿥$ʯ

ڭ৚ओٛԽ

IUUQXXXCVUVODMFCPCDPN"SUJDMF46ODMF#PC5IF5ISFF3VMFT0G5EE :PVBSFOPUBMMPXFEUPXSJUFBOZQSPEVDUJPODPEFVOMFTTJUJTUP NBLFBGBJMJOHVOJUUFTUQBTT :PVBSFOPUBMMPXFEUPXSJUFBOZNPSFPGBVOJUUFTUUIBOJT TV⒏DJFOUUPGBJMBOEDPNQJMBUJPOGBJMVSFTBSFGBJMVSFT :PVBSFOPUBMMPXFEUPXSJUFBOZNPSFQSPEVDUJPODPEFUIBOJT TV⒏DJFOUUPQBTTUIFPOFGBJMJOHVOJUUFTU
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IUUQEBWJEIFJOFNFJFSIBOTTPODPNUEEJTEFBEMPOHMJWFUFTUJOHIUNM

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ϋϯϚʔͱͳΓɺϓϩϑΣογϣφϧʹ΋ͱΔιϑτ΢ΣΞ։ൃʹ޲͔ͳ͍ਓͩͱܾΊͭ ͚ΔɻϦτϚεࢼݧࢴͩɻz IUUQEIBUFOBOFKQZBDIQ

͜ͷը૾͕ಠΓา͖ͯ͠͠·ͬͨײ͸൱Ί·ͤΜ ͜ͷϥΠΦϯ΋ಉࡑ͔

৽ͨʹςετΛॻ͖࢝Ίͨਓͷ೤ҙʹ͸஫ҙ ͠Α͏ɻ5%%ͷڧཁ΄Ͳɺ5%%ͷීٴΛ๦ ͛Δ΋ͷ͸ͳ͍ɻ ͋ͳ͕ͨ؅ཧऀ΍ϦʔμʔͰ͋ͬͯ΋ɺ୭͔ ͷಇ͖ํΛڧ੍తʹม͑Δ͜ͱ͸Ͱ͖ͳ͍ɻ ᴷ,FOU#FDL ʰςετۦಈ։ൃʱQ ݪయͰఝΛࢗ͞Ε͍ͯͨͷʹʜʜ

ҙຯͷرബԽ

ਖ਼ղͷͳ͍࣭໰ IUUQTUXJUUFSDPNIQFP@BQTUBUVT

ςετϑΝʔετͱͷࠞಉ IUUQTUXJUUFSDPNU@XBEBTUBUVT

l࿨ాϞοΫΦϒδΣΫτ͸ɺΠϯλϥΫγϣϯϕʔεͷઃܭ Λߦ͏ͨΊͷಓ۩Ͱ͋ΓɺϞοΫΦϒδΣΫτ͕ॻ͖ʹ͍͘ͳ ͱ͍͏ͷ͸ɺઃܭ͕ྑ͘ͳ͍͔ΒઃܭΛྑ͍ͯ͘͘͠ͱ͍͏ݪ ಈྗʹͳΔ͸ͣͩͬͨɻ ͔͠͠ɺϞοΫΦϒδΣΫτΛ࡞ΔͨΊͷϞοΫϥΠϒϥϦʔ ͷػೳڝ૪͕ى͖ͨ݁ՌɺϞοΫϥΠϒϥϦʔ͸ͲΜͲΜͲΜ ػೳ͕ଟػೳԽ͞Ε͍͖ͯɺͰ͖Δ͜ͱ͕૿͑ɺڧྗʹͳΕ͹ ͳΔ΄ͲɺઃܭվળޮՌ͕ͲΜͲΜബΕ͍ͯͬͯ͠·ͬͨɻ ͱʹ͔͘ڧྗͳػೳΛ࢖ͬͯɺطଘͷػೳΛແཧ΍Γςετ͢ ΔͨΊɺΧόϨοδΛ্͛ΔͨΊͷಓ۩ʹ੒ΓԼ͕ͬͯ͠·ͬ
ͨɻͦΕͬͯݱঢ়ͷ௥ೝ͡Όͳ͍Ͱ͔͢z ϞοΫϥΠϒϥϦͷڧԽͱͦͷൽ೑ͳ݁຤ IUUQTUXPQBHJMFFTNDPKQXIBUEPXFOFFEGPSHSPXUIPGGVUVSFDCBGF

ݱ࣌఺ʹ͓͚Δଟ͘ͷਓͷೝࣝ͸࣍ͷΑ͏Ͱ͋Δͱචऀ͸ଊ ͍͑ͯ·͢ɻ w5%%ςετΛઌʹॻ͘ίʔυͷॻ͖ํͷ͜ͱ wϞοΫΦϒδΣΫτςετΛॻ͘ͷ͕೉͍͠ର৅ʹର ͯ͠ແཧ΍ΓςετΛॻ͘ࡍʹ࢖͏πʔϧ w#%%TUZMFY4QFDܥͷޠኮͰςετίʔυΛॻ͘͜ͱ w#%%$VDVNCFSͷΑ͏ͳ(IFSLJOܥπʔϧΛ࢖ͬͯ ड͚ೖΕςετΛࣗಈԽ͢Δ͜ͱ ᴷ࿨ా୎ਓ ʰςετۦಈ։ൃʱʮ෇࿥$ʯ
ҙຯͷرബԽͷ݁Ռ

#%%ͷࠞཚ4QFD#%%ͱ4DFOBSJP#%% IUUQTXXXTMJEFTIBSFOFUFWFS[FUCEEJOTZNGPOZ

5%%͸ςετͩͱ͍͏ޡղΛղͨ͘Ίʹ%BO/PSUIʹΑΓ ൃ໌͞Εͨ#%%͕ɺ೥ܦ͍ͬͨ·ɺਓʑʹςετͩͱ ޡղ͞Ε͍ͯΔͷ͸ൽ೑ͳ͜ͱͩɻ IUUQTUXJUUFSDPNBTMBL@IFMMFTPZTUBUVT

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Ͳ͏ͯ͜͠͏ͳͬͨʁ ߟ͑ͯΈΔ

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ະདྷ 5%%ͷ͜Ε͔Β

5%%͸֦େ͠ɺաେධՁ͞ΕɺઌӶԽͱҙຯͷ رബԽ͕ى͜ΓɺͦͷධՁ͸΍΍աখͳͱ͜Ζ ʹམ͖ͪͯ·ͨ͠ɻ աେධՁ͕ऩ·ͬͨͷ͸ྑ͍΋ͷͷɺ࣮૾͕ࣦ ΘΕͨͷͰࠓ౓͸աখධՁʹͳ͍ͬͯ·͢ɻʰς ετۦಈ։ൃʱ͕ඳ͍࣮ͨ૾ΑΓ΋ɺഎܠ͕ࣦ ΘΕͨ෼͚ͩաখධՁͰ͢ɻ lಉ͡ͱ͜ΖʹͱͲ·Δʹ͸୾ྗ͕͍ΔzCZ ,FOU#FDL

ҙຯ͕رബԽࣦͯ͠ΘΕɺπʔϧ͚͕ͩ࢒͍ͬͯΔͷ ͕ݱ୅ͷςετͷݱঢ়Ͱ͢ɻ ͳͥ͋Δਓ͸ʮUFTUʯͱݴ͍ɺ·ͨ͋Δਓ͸ʮTQFDʯ ΍ʮFYBNQMFʯͱ͍͏໊લΛ޷Ήͷ͔ɻ աఔ΍ҙຯ෇͚͕શ෦ࣦΘΕɺςετ͸ʮॻ͔͞ΕΔʯ ΋ͷͰ͋ͬͯɺ͜ͷݴޠͷ͜ͷςετϥΠϒϥϦ͸͜͏ ࢖͏ͱ͍ͬͨ৘ใ͹͔Γ͕ݟ͔ͭΓ·͢ɻ ಓ۩͔͠࢒͍ͬͯͳ͍ͷͰɺഎܠ΍ࢥ૝ɺจ຺Λ෮׆ ͤ͞Δඞཁ͕͋Γ·ͨ͠ɻͦΕ͕ʮ෇࿥̘ʯͰ͢ɻ

ʰςετۦಈ։ൃʱ෮ץ΁ͷಓ IUUQUXBEBIBUFOBCMPHKQFOUSZUEECPPL

͜ͷ೥Ͱ೔ຊʹ͓͍ͯ΋ςετࣗಈԽ͕޿͘ߦΘΕΔΑ͏ʹͳ͕ͬͨɺ ςετۦಈ։ൃΛ࣮ફ͍ͯ͠Δਓؒ͸·ͩগͳ͘ɺཧղ͕ਐΜͰ͍Δͱ ͸͍͑ͳ͍ɻ ͔͠͠ɺʮςετۦಈ։ൃʯͱ͍͏໊લ͚ͩ͸े෼ʹ޿·ͬͨɻ ͦͷ݁Ռɺͦͷ໊લ͔Β૝ى͞ΕΔ಺༰ͱ࣮ࡍͷϓϥΫςΟεͱͷဃ཭ ʹجͮ͘ޡղ΍㒷ᨱɺςετۦಈ։ൃͷޮՌ΍ద༻ൣғʹର͢Δաେධ Ձ΍աখධՁ͕සൟʹൃੜ͍ͯ͠ΔɻͦͷҰํͰɺݪཧओٛతͳ܏޲΋ ͋ΔɻݪయͨΔຊॻʰςετۦಈ։ൃʱʹ͸ͦ͜·Ͱڭ৚ओٛతʹॻ͔ Ε͍ͯͳ͍ʹ΋ؔΘΒͣɺฉ͖͔ͬͨ͡ςετۦಈ։ൃͷखॱʹ४ڌ͢ Δ͜ͱࣗମ͕໨తԽͯ͠͠·͍ͬͯΔΤϯδχΞ΋ݟΒΕΔɻ
ͭ·Γɺ໊લ͚͕ͩҰਓา͖͍ͯ͠Δɻςετۦಈ։ൃʹؔ͢Δٞ࿦͸ ࣠Λ࣋ͨͣɺৗʹൃࢄ͢Δ܏޲ʹ͋Δɻ ຊॻΛ೔ຊͷಡऀʹ঺հ͢΂͖ཧ༝ IUUQUXBEBIBUFOBCMPHKQFOUSZUEECPPL

ະͩʹςετۦಈ։ൃʹର͢Δਖ਼֬ͳཧղ͕ਐ·ͳ͍ݪҼͷͻͱͭ ͸ɺ༷ʑͳࣄ৘΋͋Γɺଟ͘ͷΤϯδχΞʹϐΞιϯ൛ʰςετۦ ಈ։ൃೖ໳ʱ͕ಡ·Εͳ͔ͬͨ͜ͱͰ͋Ζ͏ɻʮςετۦಈ։ൃʯ ͱ͍͏໊લΛ஌͍ͬͯΔΤϯδχΞͷதͰɺϐΞιϯ൛ʰςετۦ ಈ։ൃೖ໳ʱΛಡΜͩਓͷׂ߹͕গͳ͗͢Δɻ͜ͷຊ͕޿·͍ͬͯ Ε͹ɺ࣮ྫΛ൐ͬͨ಺༰ʹΑͬͯΤϯδχΞͷཧղ΋ਐΈɺ೔ຊʹ ͓͚Δςετۦಈ։ൃͷීٴ͸ਐΜͩͱߟ͑ΒΕΔɻ ೔ຊʹ͓͚Δςετۦಈ։ൃͷਖ਼͍͠ཧղΛਐΊɺ։ൃͷݱ৔ʹΑ Γਂ͍ࣗ৴ͱվળͷػձΛ༩͑ΔͨΊʹ΋ɺ͍·ͦ͜ݪయͨΔʰς ετۦಈ։ൃʱ͕ٻΊ΍͍͢Ձ֨ͱ಺༰Ͱ෮ץ͠ɺଟ͘ͷΤϯδχ
Ξʹಡ·Εͳ͚Ε͹ͳΒͳ͍ɻ ຊॻΛ೔ຊͷಡऀʹ঺հ͢΂͖ཧ༝ IUUQUXBEBIBUFOBCMPHKQFOUSZUEECPPL

ʰςετۦಈ։ൃʱ͸ɺࣗ෼ͨͪͷίʔυʹࣗ৴Λ ࣋ͬͯ։ൃΛଓ͚͍ͨϓϩάϥϚɺνʔϜϦʔμʔ޲ ͚ͷॻ੶Ͱ͋Δɻ ͜Ε͸ςετۦಈ։ൃͷߟҊऀࣗ਎ʹΑͬͯॻ͔Εͨ ݪయͰ͋Γɺςετۦಈ։ൃͱ͸୯ʹςετࣗಈԽΛ ߦ͏͜ͱͰ͸ͳ͘ɺϢχοτςετͱϦϑΝΫλϦϯ άΛ྆ྠͱͨ͠খ͍͞αΠΫϧΛճ͢͜ͱͰෆ࣮֬ੑ Λ੍ޚ͠ɺෆஅͷઃܭਐԽΛՄೳʹ͢Δख๏Ͱ͋Δ͜ ͱΛɺಡऀ͸࣮ྫΛ௨ֶͯ͠Ϳ͜ͱ͕Ͱ͖Δɻ ΤϨϕʔλʔϐον
IUUQUXBEBIBUFOBCMPHKQFOUSZUEECPPL

%))ͷݴ͏ͱ͓Γɺ5%%#%%ͷจ຺΍എܠ͸ ͋Δఔ౓ࣦΘΕ·ͨ͠ɻ ͔͠͠ɺࣗಈςετΛॻ͘ϓϥΫςΟε͸ੈͷத ʹཱ೿ʹࠜ෇͖ɺࣗ෼ͨͪͰࣗಈςετΛॻ͘ͷ ͕ʮ;ͭ͏ʯͳੈͷதʹͳΓ·ͨ͠ɻ͜Ε͸େ͖ ͳલਐͰ͢ɻ ᴷ࿨ా୎ਓ ʰςετۦಈ։ൃʱʮ෇࿥$ʯ

wͻͱΓ͔Β࢝ΊΒΕ·͢ wςετ΍5%%͸εΩϧͰ͢ɻͭ·Γʜ w࠽ೳͰ͸ͳ͘ɺशಘՄೳͰ͢ wྔ͸࣭ʹసԽ͠·͢ wʮࣸܦʯ͕͓͢͢Ί 5%%͸εΩϧͰ͢

IUUQUXJUUFSDPNU@XBEBTUBUVTFT

ຊॻ΋ɺಡΜ͚ͩͩͰ͸ਂ͍ಘ৺ʹ͸ࢸΒͳ͍Ͱ͠ΐ ͏ɻ͔͠͠ɺςετۦಈ։ൃͷྑ͞ɺڧΈ͸खΛಈ ͔ͤ͹Θ͔Γ·͢ɻ ͳͥͳΒɺ5%%ͷຊ࣭͸ਫ਼ਆঢ়ଶͷίϯτϩʔ ϧɺෆ҆ͱࣗ৴ͷ੍ޚʹ͋Δ͔ΒͰ͢ɻ݁Ռʢॻ͔ ΕͨίʔυͱςετίʔυʣͰ͸ͳ͘ɺաఔʢࢥߟ ϓϩηεͱϦϑΝΫλϦϯάʣʹຊ࣭͕͋Γ·͢ɻ ᴷ࿨ా୎ਓ ʰςετۦಈ։ൃʱʮ෇࿥$ʯ

IUUQTXXXqJDLSDPNQIPUPTUPNQBHFOFU ςετ͸඼࣭Λ্͛ͳ͍

w ඼࣭͕ʮΘ͔ΔʯΑ͏ʹͳΔ w Θ͔Δ͜ͱͦ͜େࣄ w ςετΛॻ͚ͩ͘Ͱ͸ɺྑ͘͸ͳΒͳ͍ w ମॏܭʹ৐Δ͚ͩͰ͸૫ͤͳ͍ w ඼࣭Λ্͛Δͷ͸ઃܭͱϓϩάϥϛϯά
w ࠶ઃܭͱϦϑΝΫλϦϯάΛςετͰࢧ͑Δ ςετ͸඼࣭Λ্͛ͳ͍

lςετͰ͸඼࣭͸্͕Βͳ͍ Ͱ͢Αɻςετ͸͋͘·Ͱ΋඼ ࣭Λ͋͛Δ͖͔͚ͬɻ඼࣭Λ͋ ͛Δͷ͸ϓϩάϥϛϯάͰ͢ɻ ͜Ε͸େੲ͔Βͦ͏ɻz

ςετΛॻ͍ͯ΋ઃܭΛվળ͠ͳ͍ͷͰ͋Ε͹ɺ ͦΕ͸ͨͩͷճؼςετͰ͋Γɺݱঢ়ͷ௥ೝͰ͠ ͔͋Γ·ͤΜɻ ςετۦಈ։ൃʹ͓͚Δ࣭ͷ޲্ͷखஈ͸ɺϦ ϑΝΫλϦϯάʹΑΔܧଓతͰΠϯΫϦϝϯλϧ ͳઃܭͰ͋Γɺʮ୯ͳΔςετϑΝʔετʯͱ ʮςετۦಈ։ൃʯͷҧ͍͸ͦ͜ʹ͋Γ·͢ɻ ᴷ࿨ా୎ਓ ʰςετۦಈ։ൃʱʮ෇࿥$ʯ

ςετۦಈ։ൃ͸ɺಡऀͷօ͞Μͷϓϩάϥϛϯ άελΠϧʹগͳ͔ΒͣӨڹΛ༩͑ΔͰ͠ΐ͏ɻ ຊॻΛಡΜͩ͏͑Ͱɺ࠷ऴతʹ͸ςετۦಈ։ൃ Λ࢖Θͳ͘ͱ΋ɺશ͘໰୊͸͋Γ·ͤΜɻ ࣗ෼͕׆༻Ͱ͖ΔςΫχοΫͷͻͱͭͱͯ͠ςε τۦಈ։ൃ͕ՃΘΕ͹ɺͦΕͰे෼Ͱ͢ɻ ᴷ࿨ా୎ਓ ʰςετۦಈ։ൃʱʮ෇࿥$ʯ

ܦݧΛੵΜͩ։ൃऀ͸ɺςετίʔυͷॻ͖ํ΍ྔɺ ॻ͘λΠϛϯάʹؔͯ͠ɺࣗ෼ͷؒ߹͍Λ͍࣋ͬͯ· ͢ɻ ͞·͟·ͳύϥμΠϜɺςΫχοΫΛܦݧͯ͠໭ͬͯ ͖ͨͱ͜Ζ͕ɺ།Ұແೋͷࣗ෼ͷϓϩάϥϛϯάελ ΠϧͰ͢ɻ͞·͟·ͳੈքΛܦݧ͠ɺࣗ෼ͷελΠϧ Λݟ͚͍ͭͯͩ͘͞ɻ ᴷ࿨ా୎ਓ ʰςετۦಈ։ൃʱʮ෇࿥$ʯ

།Ұແೋͷࣗ෼ͷϓϩάϥϛϯάελΠϧΛҭΜͰ͍ͩ͘͞ ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠

テスト駆動開発の過去・現在・未来 / History of TDD - XPJUG 2018 ...

テスト駆動開発の過去・現在・未来 / History of TDD - XPJUG 2018 Keynote

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