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chore: add clock pkg for testing time

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Lines changed: 23 additions & 0 deletions

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	`1`	`+// Package clock is a library for testing time related code. It exports an interface Clock that`
	`2`	`+// mimics the standard library time package functions. In production, an implementation that calls`
	`3`	`+// thru to the standard libary is used. In testing, a Mock clock is used to precisely control and`
	`4`	`+// intercept time functions.`
	`5`	`+package clock`
	`6`	`+`
	`7`	`+import (`
	`8`	`+"context"`
	`9`	`+"time"`
	`10`	`+)`
	`11`	`+`
	`12`	`+typeClockinterface {`
	`13`	`+// NewContextTicker is a convenience function that calls f on the interval d until either the`
	`14`	`+// given context expires or f returns an error. Callers may call Wait() on the returned Waiter`
	`15`	`+// to wait until this happens and obtain the errror.`
	`16`	`+NewContextTicker(ctx context.Context,d time.Duration,ffunc()error,tags...string)Waiter`
	`17`	`+NewTimer(d time.Duration,tags...string)*Timer`
	`18`	`+}`
	`19`	`+`
	`20`	`+// Waiter can be waited on for an error.`
	`21`	`+typeWaiterinterface {`
	`22`	`+Wait(tags...string)error`
	`23`	`+}`

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