dex/vendor/github.com/jonboulle/clockwork/README.md
2018-12-03 17:13:56 +00:00

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clockwork
=========
[![Build Status](https://travis-ci.org/jonboulle/clockwork.png?branch=master)](https://travis-ci.org/jonboulle/clockwork)
[![godoc](https://godoc.org/github.com/jonboulle/clockwork?status.svg)](http://godoc.org/github.com/jonboulle/clockwork)
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 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](example_test.go) for a full example.
# Credits
clockwork is inspired by @wickman's [threaded fake clock](https://gist.github.com/wickman/3840816), and the [Golang playground](http://blog.golang.org/playground#Faking time)