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Programming language: Go
Tags: Utilities    
Latest version: v0.1.0

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README

clockwork

Build Status godoc

a simple fake clock for golang

Usage

Replace uses of the time package with the clockwork.Clock interface instead.

For example, instead of using time.Sleep directly:

func myFunc() {
    time.Sleep(3 * time.Second)
    doSomething()
}

inject a clock and use its Sleep method instead:

func myFunc(clock clockwork.Clock) {
    clock.Sleep(3 * time.Second)
    doSomething()
}

Now you can easily test myFunc with a FakeClock:

func TestMyFunc(t *testing.T) {
    c := clockwork.NewFakeClock()

    // Start our sleepy function
    var wg sync.WaitGroup
    wg.Add(1)
    go func() {
        myFunc(c)
        wg.Done()
    }()

    // Ensure we wait until myFunc is sleeping
    c.BlockUntil(1)

    assertState()

    // Advance the FakeClock forward in time
    c.Advance(3 * time.Second)

    // Wait until the function completes
    wg.Wait()

    assertState()
}

and in production builds, simply inject the real clock instead:

myFunc(clockwork.NewRealClock())

See [example_test.go](example_test.go) for a full example.

Credits

clockwork is inspired by @wickman's threaded fake clock, and the Golang playground