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(PΛ͡ΊΔʹ͋ͨͬͯ
͓͍ͬͯͯ΄͍͠πʔϧςετ
Part2
8PNFO8IP(P5PLZP!NJDDIJF
HPMBOHUPLZP
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8PNFO8IP(P
• 8PNFO8IP(Pɺʹαϯϑϥϯ
γείͰɺঁੑɾδΣϯμʔϚΠϊϦςΟͷํ
ͷͨΊͷ (PͷάϩʔόϧίϛϡχςΟͱͯ͠
ઃཱ͞Ε·ͨ͠ɻ
• 8PNFO8IP(P5PLZPɺ݄
ʹຊͰॳΊͯͷ 8PNFO8IP(Pͷίϛϡ
χςΟͱͯ͠ઃཱ͞Ε·ͨ͠ɻ
• ݄ʹҰճ
ϫʔΫγϣοϓܗࣜͰͷษڧձΛ։
࠵͍ͯ͠·͢ɻ
IUUQTXXXXPNFOXIPHPPSH
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ςετʹ͍ͭͯ
ͪΐͬ͜ͱ
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!NJDDIJFCFBS
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ςετ
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͍ΖΜͳςετ͕͋Δ
ݴޠ ςετϑϨʔϜϫʔΫ
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(Pͷςετ UFTUJOH
func Janken(you, challenger Hand) Result {
r := (you - challenger + 3) % 3
return Result(r)
}
func TestJanken(t *testing.T) {
…
}
͜ΜͳॲཧΛςετ͍ͨ͠ɻ
5FTU\໊ؔ^ খจࣈͰ࢝·Βͳ͍
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(Pͷςετ UFTUJOH
• @UFTUHPͰऴΘΔ໊લͷϑΝΠϧΛ࡞͢Δɻ
• @UFTUHP
ύοέʔδϏϧυʹؚ·Εͳ͍ɻ
• @UFTUHP
HPUFTUΛ͢Δͱ͖ͷΈ
ධՁ͞ΕΔɻ
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5BCMF%SJWFO5FTU
func TestJanken(t *testing.T) {
tests := []struct {
user, computer Hand
want Result
}{
{Rock, Rock, Even},
{Rock, Paper, Lose},
{Rock, Scissors, Win},
…
}
for _, tt := range tests {
got := Janken(tt.user, tt.computer)
if got != tt.want {
t.Errorf("%v, want %v", got, tt.want)
}
}
}
ςʔϒϧͰ༻ҙͨ͠ςετΛϧʔϓͰॲཧ͢Δɻ
=== RUN TestJanken
--- PASS: TestJanken (0.00s)
PASS
All tests passed.
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4VC5FTU
func TestJanken(t *testing.T) {
tests := []struct {
name string
user, computer Hand
want Result
}{
{"RockEven", Rock, Rock, Even},
{"RockLose", Rock, Paper, Lose},
{"RockWin", Rock, Scissors, Win},
…
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got := Janken(tt.user, tt.computer)
if got != tt.want {
t.Errorf("%v, want %v", got, tt.want)
}
})
}
}
=== RUN TestJanken
=== RUN TestJanken/RockEven
=== RUN TestJanken/RockLose
=== RUN TestJanken/RockWin
--- PASS: TestJanken (0.00s)
--- PASS: TestJanken/RockEven (0.00s)
--- PASS: TestJanken/RockLose (0.00s)
--- PASS: TestJanken/RockWin (0.00s)
PASS
All tests passed.
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4VC5FTU
for _, tt := range tests {
tt := tt
t.Run(tt.name, func(t *testing.T) {
t.Parallel()
got := Janken(tt.user, tt.computer)
if got != tt.want {
t.Errorf("%v, want %v", got, tt.want)
}
})
}
ςετͷฒྻॲཧͷ੍ޚʹར༻Ͱ͖Δɻ
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.BJO
func TestMain(m *testing.M) {
fmt.Println("Janken Test Started.")
os.Exit(m.Run())
}
ςετͷલॲཧΛઃఆ͢Δ͜ͱ͕Ͱ͖Δɻ
• Ҿͷύʔε
• ڥมͷϩʔυ
• σʔλϕʔεͷଓ
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5FTUͷ࣮ߦ
lHPIFMQUFTUz lHPIFMQUFTUGMBHzʹ͕ͯ͢ɻ
IUUQTHPMBOHPSHQLHUFTUJOH
// すべてのテストをする
go test -run ’’
// 処理名の先頭が “Bear” を含むテストをする
go test -run Bear
// 処理名の先頭が “Bear” を含み, サブテストが “A“ にマッチするテストをする
go test -run Bear/A
// サブテストが “A” にマッチするテストをする
go test -run /A
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5FTUJOH͕Ͱ͖Δ͜ͱ
ͦͷଞ
• ϕϯνϚʔΫΛऔΔɻ
• ΧόϨοδΛऔಘ͢Δɻ
• ςετΛεΩοϓ͢Δɻ
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͓·͚
(P1MBZHSPVOEͰςετΛॻ͘͜ͱ͕Ͱ͖Δɻ
IUUQTQMBZHPMBOHPSHQPY#B4Z-
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ͪΐͬ͜ͱ
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͓ͬͯ͘ͱΑ͍͜ͱ 1
άϩʔόϧͱϓϥΠϕʔτ
// パッケージの中だけで利⽤できる
func hello() {
fmt.Println("Hello, Gopher!!")
}
// パッケージの外からも利⽤できる
func Hello() {
fmt.Println("Hello, Gopher!!")
}
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͓ͬͯ͘ͱྑ͍͜ͱ 2
EFGFSͷ͜ͱ
func main() {
// 関数の最後に実行
defer fmt.Println("gopher")
fmt.Println("hello")
}
hello
gopher
Program exited.
• EFGFSΛແࢹͯ͠ऴྃ͢Δॲཧ͕͋Δɻ PT&YJU
• ϧʔϓมಉ͡ࢀরઌͳͷͰ
͜͏͢Δͱ͍͍ɻ
defer func() { fmt.Println(i) }() // loop variable i captured by func literal
defer func(i int) { fmt.Println(i) }(i) // OK
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͓ͬͯ͘ͱΑ͍͜ͱ 3
TXJUDIͷจ๏
switch bear {
case PolarBear:
fmt.Println("白い")
// break がいらない
case AmericanBlackBear:
fmt.Println("黒い")
// break がいらない
…
}
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͓ͬͯ͘ͱྑ͍͜ͱ 4
ؔͷΓ
func main() {
a, b, c := example("ビール", "日本酒")
fmt.Println(a)
fmt.Println(b)
fmt.Println(c)
}
// 複数の戻り値を指定することができる
func example(a, b string) (c, d, e string) {
return a, b, fmt.Sprintf("%s, %s", a, b)
}
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HPMBOHUPLZP
͡Ίͯຊʂ