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# Clock
A drop in (almost) replacement for the system `time` package. It provides a way
to make scheduled calls, timers and tickers deterministic in tests. By default
it forwards all calls to the system `time` package. In test, however, it is
possible to enable the frozen clock mode, and advance time manually to make
scheduled even trigger at certain moments.
# Usage
```go
package foo
import (
"testing"
"github.com/vulcand/oxy/internal/holsterv4/clock"
"github.com/stretchr/testify/assert"
)
func TestSleep(t *testing.T) {
// Freeze switches the clock package to the frozen clock mode. You need to
// advance time manually from now on. Note that all scheduled events, timers
// and ticker created before this call keep operating in real time.
//
// The initial time is set to now here, but you can set any datetime.
clock.Freeze(clock.Now())
// Do not forget to revert the effect of Freeze at the end of the test.
defer clock.Unfreeze()
var fired bool
clock.AfterFunc(100*clock.Millisecond, func() {
fired = true
})
clock.Advance(93*clock.Millisecond)
// Advance will make all fire all events, timers, tickers that are
// scheduled for the passed period of time. Note that scheduled functions
// are called from within Advanced unlike system time package that calls
// them in their own goroutine.
assert.Equal(t, 97*clock.Millisecond, clock.Advance(6*clock.Millisecond))
assert.True(t, fired)
assert.Equal(t, 100*clock.Millisecond, clock.Advance(1*clock.Millisecond))
assert.True(t, fired)
}
```
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