a simple fake clock for golang
Replace uses of the time package with the clockwork.Clock interface instead.
For example, instead of using time.Sleep directly:
func my_func() {
time.Sleep(3 * time.Second)
do_something()
}
inject a clock and use its Sleep method instead:
func my_func(clock clockwork.Clock) {
clock.Sleep(3 * time.Second)
do_something()
}
Now you can easily test my_func with a FakeClock:
func TestMyFunc(t *testing.T) {
c := clockwork.NewFakeClock()
// Start our sleepy function
var wg sync.WaitGroup
wg.Add(1)
go func() {
my_func(c)
wg.Done()
}()
// Ensure we wait until my_func is sleeping
c.BlockUntil(1)
assert_state()
// Advance the FakeClock forward in time
c.Advance(3 * time.Second)
// Wait until the function completes
wg.Wait()
assert_state()
}
and in production builds, simply inject the real clock instead:
my_func(clockwork.NewRealClock())
See example_test.go for a full example.
clockwork is inspired by @wickman's threaded fake clock, and the [Golang playground](http://blog.golang.org/playground#Faking time)
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