java-ja tdd 2nd
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TRANSCRIPT
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第二回チキチキ日本ペアプログラミングの会java-ja支部会
和田 卓人 (a.k.a id:t-wada)
Jun, 6 2009 @ java-ja 15th
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第一回チキチキ日本ペアプログラミングの会java-ja支部会
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n分でわかる第一回チキ (ry
のまとめ
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本当にありがとうございました
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自己紹介
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自己紹介名前: 和田 卓人 (わだ たくと)
ブログ: http://d.hatena.ne.jp/t-wada
メール: [email protected]
Twitter: http://twitter.com/t_wada
タワーズ・クエスト株式会社 取締役社長
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これまで書いたものWEB + DB PRESSvol.35 「実演! テスト駆動開発」vol.37 「実演! リファクタリング」vol.42 「REST特集」vol.49 「DRY特集」LifeHacks PRESSオープンソースマガジン(リレーコラム)他いろいろ
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gihyo.jpの連載『[動画で解説]和田卓人の“テスト駆動開発”講座』http://gihyo.jp/dev/serial/01/tdd/全20回すべて動画付き解説ニコニコ動画でも見れます
WEB+DB過去記事の特設サイトと動画も
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デベロッパーテスティング・ライブ - 自信を持ってコードを書くための心・技・体 -
【徹底討論】テストなんていらない?! -テストを、どこまでやるべきか?
パネルディスカッション:テストを行うこと、テストを続けること
デブサミ
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よろしくおねがいします
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Agenda•TDDとは?•TDDのこころ•TDDはじめの一歩•FAQ
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Agenda•TDDとは?•TDDのこころ•TDDはじめの一歩•FAQ
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TDDとは?
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TDDとは1. テストを書き2. そのテストを実行して失敗させ(Red)3. 目的のコードを書き4. 1で書いたテストを成功させ(Green)5. テストが通るままでリファクタリングを行う(Refactor)
6. 1~5を繰り返す
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テスト?
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テストの分類
DeveloperTesting
開発者
開発促進
CustomerTesting
顧客(のロール)
進捗管理
QATesting
品質保証担当者
(のロール)
品質保証
「テスト」
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Developer Testingとは
•プログラマの•プログラマによる•プログラマのための•プログラムとしてのテストを書きながら•開発を行っていく手法
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xUnit
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DeveloperTestingの位置づけ
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バージョン管理テスティング
自動化
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バージョン管理テスティング
自動化
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バージョン絵巻物
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バージョン管理テスティング
自動化
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素早いフィードバック
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バージョン管理テスティング
自動化
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自動化自働化
XFD
会場に詳しい人いるよ!!
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目標は?
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動作する、きれいなコードへ
きれい
汚い
(すぐには)動かない 動作する
二つの道がある
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TDDのサイクル1. テストを書き2. そのテストを実行して失敗させ(Red)3. 目的のコードを書き4. 1で書いたテストを成功させ(Green)5. テストが通るままでリファクタリングを行う(Refactor)
6. 1~5を繰り返す
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きれい
汚い
(すぐには)動かない 動作する
Red
Green
Refactoring
TDDと黄金の回転
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TDDはテスト技法では
ない
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品質保証?品質向上?
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バグ発見とコスト
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TDDは品質を
保証しない
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TDDは品質を向上する
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TDDは設計技法です
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TDDミクロの視点マクロの視点
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私たちが気付くのはいつ?
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計画する計画し続ける
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設計する設計し続ける
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テストは目的ではなく手段
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Agenda•TDDとは?•TDDのこころ•TDDはじめの一歩•FAQ
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TDDのこころ
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一つずつ少しずつ
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ひとりずつ対処する。
複数を相手にしない。
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動作する、きれいなコードへ
きれい
汚い
(すぐには)動かない 動作する
二つの道がある
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きれい
汚い
(すぐには)動かない 動作する
Red
Green
Refactoring
TDDと黄金の回転
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すばやくまわす
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REPLRead Eval Print Loop
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IDE + JUnit= Java の対話環境
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自分が最初のユーザ
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eat yourown
dog food
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不安をテストに
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勇気か蛮勇か
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脳をむだなく
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老人力ジャグリング
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IDE を使いこなせ
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EclipseNetBeans
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テストは人の為ならず
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TDDのこころ•一つずつ、少しずつ•すばやくまわす•自分が最初のユーザ•不安をテストに•脳をむだなく•テストは人の為ならず
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Agenda•TDDとは?•TDDのこころ•TDDはじめの一歩•FAQ
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TDDはじめの一歩
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一人でも始められる
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読書
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写経
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動画
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gihyo.jpの連載『[動画で解説]和田卓人の“テスト駆動開発”講座』http://gihyo.jp/dev/serial/01/tdd/全20回すべて動画付き解説ニコニコ動画でも見れます
WEB+DB過去記事の特設サイトと動画も
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小さく始める
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末端クラスから始める
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勉強会に行こう
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Agenda•TDDとは?•TDDのこころ•TDDはじめの一歩•FAQ
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FAQ
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テストのないコードが沢山あるんだけど
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テストしにくいところは?
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どこをテストすべき?
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デバッガじゃだめなの?
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テストの単位
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1クラスファイルに1テストファイル?
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1メソッドに1テスト?
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リファクタリングに終わり無いんじゃ?
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カバレッジ100%の誤解
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まとめ
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TDDのこころ•一つずつ、少しずつ•すばやくまわす•自分が最初のユーザ•不安をテストに•脳をむだなく•テストは人の為ならず
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きれい
汚い
(すぐには)動かない 動作する
Red
Green
Refactoring
TDDと黄金の回転
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デモ
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Eclipse Galileo RC2
Quick-JUnit 0.5 beta
JUnitMax
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TDDの基本テクニック• テストファースト• アサートファースト
• 仮実装(Fake it)• Fake it はテストのテスト
• 三角測量(Triangulation)• 明白な実装(Obvious Implementation)
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Design for Testability
• テストしやすいコードを書くためには?• テストから先に書く => テスト可能になる• テストを考える = 設計を考える
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Refactoring
• 呼吸をするようにリファクタリングする• Rename (改名)• Extract (抽出)• Inline (インライン化)
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おわりに
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テストはスキルです• テストやTDDはスキルです。つまり…• 才能ではなく、習得可能です• 量は質に転化します• 写経!!
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ご清聴ありがとうございました