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// Copyright 2018 Google LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package clock
import (
"fmt"
"testing"
"time"
)
func checkNotFiring(t *testing.T, timer Timer) {
t.Helper()
select {
case tm := <-timer.Chan():
t.Errorf("Timer unexpectedly fired at %v", tm)
case <-time.After(10 * time.Millisecond): // Give some real time to pass.
}
}
func TestFakeTimerFiresOnce(t *testing.T) {
base := time.Date(2018, 12, 12, 18, 0, 0, 0, time.UTC)
ts := NewFake(base)
timer := ts.NewTimer(10 * time.Millisecond)
checkNotFiring(t, timer)
newTime := base.Add(9 * time.Millisecond)
ts.Set(newTime)
checkNotFiring(t, timer)
newTime = newTime.Add(1 * time.Millisecond)
ts.Set(newTime)
got := <-timer.Chan() // Now it should fire.
if !got.Equal(newTime) {
t.Errorf("Timer fired at %v, want %v", got, newTime)
}
checkNotFiring(t, timer) // Shouldn't fire any more.
}
func TestFakeTimerStopBeforeFire(t *testing.T) {
base := time.Date(2018, 12, 12, 18, 0, 0, 0, time.UTC)
ts := NewFake(base)
timer := ts.NewTimer(10 * time.Millisecond)
checkNotFiring(t, timer)
if !timer.Stop() {
t.Error("Stop() returns true, want false")
}
newTime := base.Add(20 * time.Millisecond)
ts.Set(newTime)
checkNotFiring(t, timer) // Shouldn't fire because it was stopped.
}
func TestFakeTimerStopAfterFire(t *testing.T) {
for _, drain := range []bool{false, true} {
t.Run(fmt.Sprintf("drain:%v", drain), func(t *testing.T) {
base := time.Date(2018, 12, 12, 18, 0, 0, 0, time.UTC)
ts := NewFake(base)
timer := ts.NewTimer(10 * time.Millisecond)
ts.Set(base.Add(20 * time.Millisecond)) // Triggers the event.
if drain {
<-timer.Chan()
}
if timer.Stop() {
t.Error("Stop() returns false, want true")
}
})
}
}
func TestManyFakeTimers(t *testing.T) {
base := time.Date(2018, 12, 12, 18, 0, 0, 0, time.UTC)
ts := NewFake(base)
var timers []Timer
var times []time.Time
for i := 1; i <= 10; i++ {
d := time.Duration(i) * time.Second
timers = append(timers, ts.NewTimer(d))
times = append(times, base.Add(d))
}
check := func(fire int, want time.Time) {
for i, timer := range timers {
if i != fire {
checkNotFiring(t, timer)
continue
}
got := <-timer.Chan()
if !got.Equal(want) {
t.Errorf("Timer %d fired at %v, want %v", i, got, want)
}
}
}
check(-1, time.Time{}) // No firing before.
for i, fTime := range times {
ts.Set(fTime)
check(i, fTime)
}
check(-1, time.Time{}) // No firing after.
}
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