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·ͩ·ͩؒʹ߹͏ +6OJU ࠶ ೖ໳ ࢁຊϢʔεέ KKVH@DDDDDD@H

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ࢁຊϢʔεέ!ZVTVLF w+BWBνϟϯϐΦϯ w%VLFT$IPJDF"XBSEड৆

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ྑ͋͘Δ։ൃ޻ఔ ઃܭ ࣮૷ ςετ σόοά ӡ༻ ཁ݅ఆٛ

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։ൃͷ࣮ࡍ Yʙ㱣 ઃܭ ࣮૷ ςετ σόοά ӡ༻ ཁ݅ఆٛ

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ʮςετ޻ఔʯͷ໰୊ w ਓ͕ؒߦ͏ςετͷ৴པੑ w ίετɺ࣌ؒͷ੍ݶ͔Βճؼςετ͕೉͍͠ w σόοά׬ྃΛ։ൃऀ͕֬ೝ͠ͳ͍ w όάΛࢦఠ͞ΕΔ৺ཧతμϝʔδ w ςετ޻ఔཁһͷͨΊʹόάΛ࢒͢ʜʁ

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ςετΛࣗಈԽ w ਓؒΑΓ΋ߴ͍৴པੑ৴པੑ w ճؼςετΛݱ࣮తͳίετͰ࣮ݱՄ ೳ w σόοά׬ྃΛ࣮૷࣌ʹ֬ೝ w σόοάָ͕͘͠ͳΔ

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+6OJUͱ͸ wUIFQSPHSBNNFSGSJFOEMZUFTUJOH GSBNFXPSLGPS+BWB wʮ+BWB޲͚ͷϓϩάϥϚϑϨϯυϦͳ ςετϑϨʔϜϫʔΫʯ IUUQTKVOJUPSHKVOJU

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+6OJUͱ͸ w+BWBίʔυͷςετΛ؆୯ʹ͢Δϑ ϨʔϜϫʔΫ +BWB +6OJUɺ5FTU/( 1ZUIPO VOJUUFTU 1)1 1)16OJU 3VCZ UFTUVOJUɺ34QFD $ /6OJUɺ.45FTU ओཁݴޠͷςετϑϨʔϜϫʔΫ

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ࠓճͷςετର৅'J[[#V[[ w ʙ·Ͱͷ਺ࣈʹ͍ͭͯʜ w ͷഒ਺ͷ৔߹'J[[ΛϓϦϯτ w ͷഒ਺#V[[ΛϓϦϯτ w ͲͪΒͰ΋ͳ͍৔߹਺ࣈΛϓϦϯτ

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ࠓճͷςετର৅'J[[#V[[ public class FizzBuzz { public static void main(String[] args){ for(int i=0;i<100;i++){ System.out.println(fizzBuzz(i)); } } public static String fizzBuzz(int number) { // ͜͜Λ࣮૷ } }

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࠷খݶͷ+6OJUςετ import org.junit.jupiter.api.Test; import static org.junit.jupiter.api.Assertions.*; class FizzBuzzTest { @Test void fizzBuzz { assertEquals("FizzBuzz",FizzBuzz.fizzBuzz(15)); } }

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import org.junit.jupiter.api.Test; import static org.junit.jupiter.api.Assertions.*; class FizzBuzzTest { @Test void fizzBuzz { assertEquals("FizzBuzz",FizzBuzz.fizzBuzz(15)); } } Ξϊςʔγϣϯ Ξαʔγϣϯϝιου +6OJUςετͷେࣄͳೋཁૉ

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import org.junit.jupiter.api.Test; import static org.junit.jupiter.api.Assertions.*; class FizzBuzzTest { @Test void fizzBuzz { assertEquals("FizzBuzz",FizzBuzz.fizzBuzz(15)); } } @TestΞϊςʔγϣϯ ςετΛߦ͏ϝιουͩͱએݴ

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import org.junit.jupiter.api.Test; import static org.junit.jupiter.api.Assertions.*; class FizzBuzzTest { @Test void fizzBuzz { assertEquals("FizzBuzz",FizzBuzz.fizzBuzz(15)); } } assertEquals(a, b) b͕aͱ౳͍͜͠ͱΛओு

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όά͍ͬͯΔ࣮૷ public class FizzBuzz { public static void main(String[] args){ for(int i=0; i<100; i++){ System.out.println(fizzBuzz(i)); } } public static String fizzBuzz(int number) { return "Fizz"; } } p[[#V[[͕'J[[͔͠ฦ͞ͳ͍

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όά͍ͬͯΔ࣮૷ͷ+6OJU࣮ߦ݁Ռ

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όά͍ͬͯΔ࣮૷ͷ+6OJU࣮ߦ݁Ռ IDEͰςετ࣮ߦɺࣦഊͨ͠ςετΛҰཡ

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+6OJU࣮ߦ݁Ռ assertEquals("FizzBuzz",FizzBuzz.fizzBuzz(15));

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ςετΛॆ࣮ͤ͞Δ class FizzBuzzTest { @Test void fizzBuzz { assertEquals("FizzBuzz",FizzBuzz.fizzBuzz(15)); assertEquals("FizzBuzz",FizzBuzz.fizzBuzz(45)); assertEquals("FizzBuzz",FizzBuzz.fizzBuzz(60)); } @Test void fizz {} @Test void buzz {} @Test void number {} }

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class FizzBuzzTest { @Test void fizzBuzz { assertEquals("FizzBuzz",FizzBuzz.fizzBuzz(15)); assertEquals("FizzBuzz",FizzBuzz.fizzBuzz(45)); assertEquals("FizzBuzz",FizzBuzz.fizzBuzz(60)); } @Test void fizz {} @Test void buzz {} @Test void number {} } ςετΛॆ࣮ͤ͞Δ ςετύλʔϯΛ૿΍͢ͱ඼࣭͕޲্ ςετϝιου͸Կݸ͋ͬͯ΋ྑ͍ Ξαʔγϣϯ͸Կݸ͋ͬͯ΋ྑ͍

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class FizzBuzzTest { @Test void fizzBuzz { assertEquals("FizzBuzz",FizzBuzz.fizzBuzz(15)); assertEquals("FizzBuzz",FizzBuzz.fizzBuzz(45)); assertEquals("FizzBuzz",FizzBuzz.fizzBuzz(60)); } @Test void fizz {} @Test void buzz {} @Test void number {} } ςετΛॆ࣮ͤ͞Δ ςετύλʔϯΛ૿΍͢ͱ඼࣭͕޲্ ςετϝιου͸Կݸ͋ͬͯ΋ྑ͍ Ξαʔγϣϯ͸Կݸ͋ͬͯ΋ྑ͍ assertϝιουͰ࠷ॳʹࣦഊͨ͠ ͱ͜ΖͰςετϝιουͷ࣮ߦ͸ఀࢭ

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ϓϩδΣΫτʹ͓͚Δ+6OJUͷઃఆ

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.BWFOͷ৔߹ w QPNYNMʹґଘΛهड़

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(SBEMFͷ৔߹ w CVJMEHSBEMFʹґଘΛهड़

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+6OJUςετͷ࣮ߦํ๏

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+6OJUςετͷ࣮ߦ w *%&͔Β w ίϚϯυϥΠϯ͔Β w $*αʔό͔Β

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+6OJUςετͷ࣮ߦ*%&͔Β w ࠷΋Ұൠత w ଟ͘ͷ*%&Ͱ͸(6*Ͱ࣮ߦՄೳ

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+6OJUςετͷ࣮ߦίϚϯυϥΠϯ͔Β w .BWFO΍(SBEMFΛ࢖͏ NWOUFTU HSBEMFUFTU

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୅දతͳΞαʔγϣϯϝιου w BTTFSU&RVBMT B C BͱC͕౳͍͠ w BTTFSU5SVF B B͕USVF w BTTFSU'BMTF B B͕GBMTF w BTTFSU/VMM B B͕OVMM w BTTFSU/PU/VMM B B͕OVMMͰͳ͍

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୅දతͳΞϊςʔγϣϯ w !5FTUςετϝιουͷϚʔΫ ຖςετϝιουલޙʹॲཧ w !#FGPSF&BDI֤ςετͷલʹॲཧ w !"GUFS&BDI֤ςετͷޙʹॲཧ ΫϥεͰҰ౓͚ͩॳظԽޙॲཧ w !#FGPSF"MMશςετͷલʹॲཧ w !"GUFS"MMશςετͷޙʹॲཧ

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σϞ

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Ҏલͷόʔδϣϯͷ+6OJU

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+6OJUͷόʔδϣϯ w +6OJUY޿͘ීٴ w +6OJUYΞϊςʔγϣϯಋೖ w +6OJUYϥϜμࣜಋೖ

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+VOJUYͱ+6OJUYͷҧ͍

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+VOJUY w Ξϊςʔγϣϯ͕Ұ෦ҧ͏ w ςετΫϥεɺϝιου͸QVCMJD w )BNDSFTU BTTFSU5IBU Ϛονϟʔ͕ಉࠝ

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+6OJUYͱ+6OJUY +6OJUY +6OJUY !#FGPSF !#FBGPSF&BDI !"GUFS !"GUFS&BDI !#FGPSF$MBTT !#FGPSF"MM !"GUFS$MBTT !"GUFS"MM Ξϊςʔγϣϯͷҧ͍

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+6OJUYͱ+6OJUY IBNDSFTUΞαʔγϣϯ assertThat(a, equalTo(b)); assertEquals(b, a); JUnit 5Ͱ΋ґଘΛ௥Ճ͢Ε͹hamcrest͸ར༻Մೳ JUnit 4.x JUnit 5.x JUnit 4.xͰ΋assertEqualsͳͲ͸ඪ४Ͱར༻Մೳ

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class FizzBuzzTest { @Test void fizzBuzz { assertEquals("FizzBuzz",FizzBuzz.fizzBuzz(15)); } } public class FizzBuzzTest { @Test public void fizzBuzz { assertThat(FizzBuzz.fizzBuzz(15), equalTo("FizzBuzz")); } } JUnit 4.x JUnit 5.x

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+VOJUYͱ+6OJUYͷҧ͍

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+VOJUY w Ξϊςʔγϣϯ͕ͳ͍ w ςετΫϥε͸5FTU$BTFΛܧঝ w ςετϝιου͸UFTUͰ࢝ΊΔ w ςετΫϥεɺϝιου͸QVCMJD

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import org.junit.jupiter.api.Test; import static org.junit.jupiter.api.Assertions.*; class FizzBuzzTest { @Test void fizzBuzz { assertEquals("FizzBuzz",FizzBuzz.fizzBuzz(15)); } } import junit.framework.TestCase; public class FizzBuzzTest extends TestCase { public void testFizzBuzz { assertEquals("FizzBuzz",FizzBuzz.fizzBuzz(15)); } } JUnit 3.x JUnit 5.x

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ςετͷίπ

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ςετͷίπ ςετΛઌʹॻ͘

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ςετΛઌʹॻ͘ w ςετࣦഊΛ֬ೝ͔ͯ͠Β࣮૷

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ςετΛઌʹॻ͘ w ςετࣦഊΛ֬ೝ͔ͯ͠Β࣮૷ ޙ͔ΒςετΛॻ͘ͱ࣮૷಺༰ʹؔΘΒͣ ੒ޭ͢Δςετʹͳͬͯ͠·͏͜ͱ͕ɾɾɾ

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TDD: Test Driven Development Test Early Fail Fast

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ςετͷίπ ෼͔Γ΍͍͢ ςετϝιου໊

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෼͔Γ΍͍͢ςετϝιου໊ @Test void orderInfo1 {…} @Test void orderInfo2 {…} ςετ಺༰͕෼͔Βͳ͍ςετϝιου໊

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෼͔Γ΍͍͢ςετϝιου໊ @Test void ड஫લʹ੥ٻঢ়ଶʹ͸ભҠͰ͖ͳ͍ {…} @Test void લ෷͍ͷ͓٬༷ʹ͸੥ٻॻͰ͸ͳ͘ೲ඼ॻΛൃߦ {…} @Test void orderInfo1 {…} @Test void orderInfo2 {…} ςετ಺༰͕෼͔Βͳ͍ςετϝιου໊ ςετ಺༰͕ࣗ໌ͳςετϝιου໊

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@Test void ड஫લʹ੥ٻঢ়ଶʹ͸ભҠͰ͖ͳ͍ {…} @Test void લ෷͍ͷ͓٬༷ʹ͸੥ٻॻͰ͸ͳ͘ೲ඼ॻΛൃߦ {…} @Test void orderInfo1 {…} @Test void orderInfo2 {…} ςετ಺༰͕෼͔Βͳ͍ςετϝιου໊ ςετ಺༰͕ࣗ໌ͳςετϝιου໊ ෼͔Γ΍͍͢ςετϝιου໊ ϓϩδΣΫτϝϯόʔશһ೔ຊޠʹתೳͰ͋ Ε͹ϝιου໊͸೔ຊޠͰ΋OK

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ςετͷίπ ςετϝιου಺ʹ BTTFSUJPOΛॻ͖͗͢ͳ͍

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ϝιου಺ʹBTTFSUJPOΛॻ͖͗͢ͳ͍ w ΄Ͳ΄Ͳʹ·ͱ·ͬͨ୯ҐͰ w ඞཁʹԠͯ͡BTTFSU"MMΛར༻

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BTTFSU"MM import static FizzBuzz.* class FizzBuzzTest { @Test void fizzBuzz { assertAll( () -> assertEquals("Fizz", fizzBuzz(3)), () -> assertEquals("Buzz", fizzBuzz(5)), () -> assertEquals("7", fizzBuzz(7)), () -> assertEquals("FizzBuzz", fizzBuzz(15)) ); } ϥϜμࣜΛ࢖ͬͯ·ͱΊͯݕূ ࣦഊ͢ΔΞαʔγϣϯ͕͋ͬͯ΋શͯݕূ

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BTTFSU"MM assertAll಺ͷࣦഊͨ͠assertશ͕ͯใࠂ͞ΕΔ

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ςετͷίπ̐ ΧόϨοδʢ໢ཏ౓ʣ ʹͩ͜ΘΓ͗͢ͳ͍

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ΧόϨοδʹͩ͜ΘΓ͗͢ͳ͍ w ΧόϨοδ࣮ߦՄೳͳߦͷ͏ͪɺςε τΛ࣮ࢪͨ͠ߦͷׂ߹ w *%&΍$*ͰଌఆՄೳ w HFUUFSTFUUFSͷςετ͸ෆཁ w ࣮ূࡁΈίʔυ ஶ໊ϥΠϒϥϦͳͲ ͷ ڍಈ͸ςετ͠ͳ͍

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ςετΛ༏ઌతʹॻ͘΂͖ର৅ w ࣮૷͕ෆ҆ͳՕॴ w όάɺϦάϨογϣϯ͕ൃੜ͠ ͦ͏ͳՕॴ w ϦϑΝΫλϦϯάΛࢪ͢Օॴ

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QSJWBUFϝιουͷςετ͸ʁ w QBDLBHFQSJWBUFʹ w ޡ༻͕৺഑ͳ৔߹͸ίϝϯτ

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ςετΛ࢝ΊΑ͏

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ςετΛ࢝ΊΔ w खಈςετ͕ඪ४ͳͷͰ೉͍͠ʁ

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ςετΛ࢝ΊΔ w खಈςετ͕ඪ४ͳͷͰ೉͍͠ʁ w ̍ਓͰ΋࢝ΊΒΕ·͢

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ςετΛ࢝ΊΔ w ςετΛॻ͘෼༨ܭʹ͕͔͔࣌ؒΔͷͰ͸ʁ

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ςετΛ࢝ΊΔ w ςετΛॻ͘෼༨ܭʹ͕͔͔࣌ؒΔͷͰ͸ʁ w Ή͠Ζૣ͘ͳΓ·͢

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ςετ͕श׳Խͨ͠Β

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$* $POUJOVPVT*OUFHSBUJPO w +FOLJOTɺ$JSDMF$*ɺ5FBN$JUZ w ςετ࣮ߦΛࣗಈԽ w ςετ࣮ߦͷ࿙Ε͕ͳ͘ͳΔ w ςετ׬ྃΛ଴ͨͣʹผͷ࡞ۀ͕Ͱ͖Δ

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4FMFOJVN w ϩδοΫ͚ͩͰͳ͘ɺ8FCΞϓϦέʔγϣϯ ͷૢ࡞΋ςετՄೳ w ϑΥʔϜೖྗ w εΫϦʔϯγϣοτ

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࣭໰ʁ

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͋Γ͕ͱ͏͍͟͝·ͨ͠