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Wataru / boru 課題2 #11
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.idea | ||
.DS_Store |
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# 課題 2 | ||
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## 【TRY】io.Readerとio.Writer | ||
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### io.Readerとio.Writerについて調べてみよう | ||
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- 標準パッケージでどのように使われているか | ||
- io.Readerとio.Writerがあることでどういう利点があるのか具体例を挙げて考えてみる | ||
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> - 標準パッケージでどのように使われているか | ||
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- 実装している標準パッケージ | ||
- bufio | ||
- bytes | ||
- zip | ||
- strings | ||
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- どの様に使われているか | ||
- strings | ||
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``` | ||
func (w *appendSliceWriter) Write(p []byte) (int, error) { | ||
*w = append(*w, p...) | ||
return len(p), nil | ||
} | ||
``` | ||
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- bufio | ||
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``` | ||
func (b *Writer) Write(p []byte) (nn int, err error) { | ||
for len(p) > b.Available() && b.err == nil { | ||
var n int | ||
if b.Buffered() == 0 { | ||
// Large write, empty buffer. | ||
// Write directly from p to avoid copy. | ||
n, b.err = b.wr.Write(p) | ||
} else { | ||
n = copy(b.buf[b.n:], p) | ||
b.n += n | ||
b.Flush() | ||
} | ||
nn += n | ||
p = p[n:] | ||
} | ||
if b.err != nil { | ||
return nn, b.err | ||
} | ||
n := copy(b.buf[b.n:], p) | ||
b.n += n | ||
nn += n | ||
return nn, nil | ||
} | ||
``` | ||
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- zip | ||
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``` | ||
func (w *fileWriter) Write(p []byte) (int, error) { | ||
if w.closed { | ||
return 0, errors.New("zip: write to closed file") | ||
} | ||
w.crc32.Write(p) | ||
return w.rawCount.Write(p) | ||
} | ||
``` | ||
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> - io.Readerとio.Writerがあることでどういう利点があるのか具体例を挙げて考えてみる | ||
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1. 各パッケージで扱っている書き込み先は全て違うが、同じインターフェースにて抽象化されていること中の実装は隠蔽され、利用者としてはそれぞれ全て等しく `Write` や `Read` で利用することができる。 | ||
2. 上記の通り隠蔽されることで、書き込み先や読み込み先という仕様が変更になったとしても、利用するパッケージを変更するだけで実現が可能になる。(変更容易性が上がる) | ||
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## 【TRY】テストを書いてみよう | ||
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### 1回目の課題のテストを作ってみて下さい | ||
- テストのしやすさを考えてリファクタリングしてみる | ||
- テストのカバレッジを取ってみる | ||
- テーブル駆動テストを行う | ||
- テストヘルパーを作ってみる | ||
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## 動作手順 | ||
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``` | ||
$ go test ./imageconverter | ||
$ go test ./commands/imageconverter | ||
``` | ||
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## カバレッジ | ||
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- imageconverter | ||
`./imageconverter_coveage.html` | ||
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- main | ||
`./imageconverter_coveage.html` | ||
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## 感想等 | ||
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### io.Readerとio.Writerについて調べてみよう | ||
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- Interfaceを利用した | ||
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### 【TRY】テストを書いてみよう | ||
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- 可能な限り、テスト対象の関数内で利用しているパッケージをMockして、依存を減らす様にしました。(Mockのパッケージを使わないで実現するのに相当苦労しました。) | ||
- 画像のエンコードを、ストラテジーパターンを利用してリファクタリングしました。 | ||
- テスタブルなコードを目指すあまり、実装として読みにくくなっていないか気になっています。 | ||
|
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package main | ||
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import ( | ||
"flag" | ||
"fmt" | ||
"os" | ||
"testing" | ||
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"github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter" | ||
) | ||
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const ( | ||
// ExitCodeSuccess is the exit code on success | ||
ExitCodeSuccess = 0 | ||
// ExitCodeError is the exit code when failed | ||
ExitCodeError = 1 | ||
// ExitCodeError is the exit code when failed | ||
ExitCodeInvalidDirectoryError = 2 | ||
) | ||
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var ( | ||
args imageconverter.Args | ||
osStat func(name string) (os.FileInfo, error) | ||
osIsNotExist func(err error) bool | ||
imgconv func(args imageconverter.Args) error | ||
) | ||
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func init() { | ||
testing.Init() | ||
flag.StringVar(&args.Directory, "dir", "", "Input target Directory.\n ex) `--dir=./convert_image`") | ||
flag.StringVar(&args.Directory, "d", "", "Input target Directory. (short)") | ||
flag.StringVar(&args.BeforeExtension, "before", "jpg", "Input extension before conversion.\n ex) `--before=png`") | ||
flag.StringVar(&args.BeforeExtension, "b", "jpg", "Input extension before conversion. (short)") | ||
flag.StringVar(&args.AfterExtension, "after", "png", "Input extension after conversion.\n ex) `--after=jpg`") | ||
flag.StringVar(&args.AfterExtension, "a", "png", "Input extension after conversion. (short)") | ||
flag.Parse() | ||
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osStat = func(name string) (os.FileInfo, error) { | ||
return os.Stat(name) | ||
} | ||
osIsNotExist = func(err error) bool { | ||
return os.IsNotExist(err) | ||
} | ||
imgconv = imageconverter.Convert | ||
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} | ||
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func run() int { | ||
if args.Directory == "" { | ||
fmt.Fprintln(os.Stderr, "Input target Directory.\n ex) `--dir=./convert_image`") | ||
return ExitCodeInvalidDirectoryError | ||
} | ||
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if _, err := osStat(args.Directory); osIsNotExist(err) { | ||
fmt.Fprintln(os.Stderr, "Target directory is not found.") | ||
return ExitCodeInvalidDirectoryError | ||
} | ||
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if err := imgconv(args); err != nil { | ||
fmt.Fprintln(os.Stderr, err.Error()) | ||
return ExitCodeError | ||
} | ||
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return ExitCodeSuccess | ||
} | ||
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func main() { | ||
os.Exit(run()) | ||
} |
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package main | ||
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import ( | ||
"flag" | ||
"fmt" | ||
"os" | ||
"testing" | ||
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"github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter" | ||
) | ||
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type mockFns struct { | ||
osStat func(name string) (os.FileInfo, error) | ||
osIsNotExist func(err error) bool | ||
imgconv func(args imageconverter.Args) error | ||
} | ||
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func Test_run(t *testing.T) { | ||
tests := []struct { | ||
name string | ||
args imageconverter.Args | ||
mocks mockFns | ||
want int | ||
}{ | ||
{ | ||
name: "Normal", | ||
args: imageconverter.Args{ | ||
Directory: "./hoge", | ||
BeforeExtension: "jpg", | ||
AfterExtension: "png", | ||
}, | ||
mocks: mockFns{ | ||
osStat: func(name string) (os.FileInfo, error) { | ||
return nil, nil | ||
}, | ||
osIsNotExist: func(err error) bool { | ||
return false | ||
}, | ||
imgconv: func(args imageconverter.Args) error { | ||
return nil | ||
}, | ||
}, | ||
want: ExitCodeSuccess, | ||
}, | ||
{ | ||
name: "ErrorBecauseWithoutArgsDirectory", | ||
args: imageconverter.Args{ | ||
Directory: "", | ||
BeforeExtension: "jpg", | ||
AfterExtension: "png", | ||
}, | ||
mocks: mockFns{ | ||
osStat: func(name string) (os.FileInfo, error) { | ||
return nil, nil | ||
}, | ||
osIsNotExist: func(err error) bool { | ||
return false | ||
}, | ||
imgconv: func(args imageconverter.Args) error { | ||
return nil | ||
}, | ||
}, | ||
want: ExitCodeInvalidDirectoryError, | ||
}, | ||
{ | ||
name: "ErrorBecauseOsIsNotExitReturnError", | ||
args: imageconverter.Args{ | ||
Directory: "./hoge", | ||
BeforeExtension: "jpg", | ||
AfterExtension: "png", | ||
}, | ||
mocks: mockFns{ | ||
osStat: func(name string) (os.FileInfo, error) { | ||
return nil, nil | ||
}, | ||
osIsNotExist: func(err error) bool { | ||
return true | ||
}, | ||
imgconv: func(args imageconverter.Args) error { | ||
return nil | ||
}, | ||
}, | ||
want: ExitCodeInvalidDirectoryError, | ||
}, | ||
{ | ||
name: "ErrorBecauseImgconvReturnError", | ||
args: imageconverter.Args{ | ||
Directory: "./hoge", | ||
BeforeExtension: "jpg", | ||
AfterExtension: "png", | ||
}, | ||
mocks: mockFns{ | ||
osStat: func(name string) (os.FileInfo, error) { | ||
return nil, nil | ||
}, | ||
osIsNotExist: func(err error) bool { | ||
return false | ||
}, | ||
imgconv: func(args imageconverter.Args) error { | ||
return fmt.Errorf("error") | ||
}, | ||
}, | ||
want: ExitCodeError, | ||
}, | ||
} | ||
for _, tt := range tests { | ||
t.Run(tt.name, func(t *testing.T) { | ||
flagsSet(t, tt.args) | ||
MockSet(t, tt.mocks) | ||
if got := run(); got != tt.want { | ||
t.Errorf("run() = %v, want %v", got, tt.want) | ||
} | ||
}) | ||
} | ||
} | ||
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func flagsSet(t *testing.T, args imageconverter.Args) { | ||
t.Helper() | ||
if err := flag.CommandLine.Set("dir", args.Directory); err != nil { | ||
t.Errorf("error occurred in flagSet helper: %v", err) | ||
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} | ||
if err := flag.CommandLine.Set("before", args.BeforeExtension); err != nil { | ||
t.Errorf("error occurred in flagSet helper: %v", err) | ||
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} | ||
if err := flag.CommandLine.Set("after", args.AfterExtension); err != nil { | ||
t.Errorf("error occurred in flagSet helper: %v", err) | ||
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} | ||
} | ||
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func MockSet(t *testing.T, m mockFns) { | ||
t.Helper() | ||
osStat = m.osStat | ||
osIsNotExist = m.osIsNotExist | ||
imgconv = m.imgconv | ||
} |
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mode: set | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:29.13,33.46 4 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:36.2,37.44 2 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:40.2,41.33 2 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:33.46,35.3 1 0 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:37.44,39.3 1 0 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:57.65,59.2 1 0 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:63.64,65.2 1 0 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:69.64,71.2 1 0 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:75.64,77.2 1 0 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:81.65,83.2 1 0 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:85.52,86.45 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:87.23,88.28 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:89.14,90.27 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:91.14,92.27 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:93.14,94.27 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:95.23,96.28 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:97.10,98.106 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:102.44,104.16 2 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:107.2,110.16 3 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:114.2,114.15 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:120.2,121.16 2 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:125.2,126.16 2 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:129.2,129.32 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:104.16,106.3 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:110.16,112.3 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:114.15,115.17 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:115.17,117.4 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:121.16,123.3 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:126.16,128.3 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:132.78,133.16 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:137.2,137.18 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:141.2,142.37 2 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:145.2,145.72 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:133.16,135.3 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:137.18,139.3 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:142.37,144.3 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:151.31,152.92 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:152.92,154.3 1 1 | ||
github.com/gopherdojo/dojo8/kadai1/wataboru/imageconverter/ImageConverter.go:157.48,159.2 1 1 |
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module github.com/gopherdojo/dojo8/kadai1/wataboru | ||
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go 1.14 | ||
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require ( | ||
golang.org/x/image v0.0.0-20200618115811-c13761719519 | ||
golang.org/x/tools v0.0.0-20200713011307-fd294ab11aed // indirect | ||
) |
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mainのテストにて、flag.Parse() をinitの中で実行していたため、testでflag引数を渡すことができず苦戦しました。こちら、run()側にflag.Parse() を渡すのか、 testing.Init() を呼び出すか、どちらが良いか悩んでいます。あまりテストコードが実装に漏れるのが嫌なのですが。。。他の方法があれば知りたいです。