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これは何か?
Go で意図的に race conditions を発生させるサンプルです。
実装で
concurrent map writes
が発生するコードを仕込んでいるので test にて3並行処理を行い実際にconcurrent map writes
が発生するコードを作ります。毎回ではないですが、競合状態を引き起こすテストになってます。
また race コンディションもチェックします。
意図通り発生します。