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    use std::time::{Instant, Duration};

    pub trait Interval : Default {
    	fn now(&self) -> Instant {
    		Instant::now()
    	}

    	fn elapsed(&self, instant: Instant) -> Duration {
    		instant.elapsed()
    	}
    }

    #[derive(Default)]
    pub struct RealInterval;

    impl Interval for RealInterval { }

    #[derive(Default)]
    #[cfg(test)]
    pub struct FixedIntervalSpawner {
    	step_millis: u64,
    }

    #[cfg(test)]
    impl FixedIntervalSpawner {
    	pub fn new(step_millis: u64) -> Self {
    		FixedIntervalSpawner { step_millis : step_millis }
    	}
    }

    #[cfg(test)]
    impl Interval for FixedIntervalSpawner {
    	fn now(&self) -> Instant {
    		Instant::now()
    	}

    	fn elapsed(&self, instant: Instant) -> Duration {
    		(instant - Duration::from_millis(self.step_millis)).elapsed()
    	}
    }

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