k8s.io/apiserver@v0.31.1/pkg/util/flowcontrol/fairqueuing/eventclock/real_event_clock_test.go (about) 1 /* 2 Copyright 2021 The Kubernetes Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package eventclock 18 19 import ( 20 "math/rand" 21 "sync/atomic" 22 "testing" 23 "time" 24 ) 25 26 func TestRealEventClock(t *testing.T) { 27 ec := Real{} 28 var numDone int32 29 now := ec.Now() 30 const batchSize = 100 31 times := make(chan time.Time, batchSize+1) 32 try := func(abs bool, d time.Duration) { 33 f := func(u time.Time) { 34 realD := ec.Since(now) 35 atomic.AddInt32(&numDone, 1) 36 times <- u 37 if realD < d { 38 t.Errorf("Asked for %v, got %v", d, realD) 39 } 40 } 41 if abs { 42 ec.EventAfterTime(f, now.Add(d)) 43 } else { 44 ec.EventAfterDuration(f, d) 45 } 46 } 47 try(true, time.Millisecond*3300) 48 for i := 0; i < batchSize; i++ { 49 d := time.Duration(rand.Intn(30)-3) * time.Millisecond * 100 50 try(i%2 == 0, d) 51 } 52 time.Sleep(time.Second * 4) 53 if atomic.LoadInt32(&numDone) != batchSize+1 { 54 t.Errorf("Got only %v events", numDone) 55 } 56 lastTime := now 57 for i := 0; i <= batchSize; i++ { 58 nextTime := <-times 59 if nextTime.Before(now) { 60 continue 61 } 62 dt := nextTime.Sub(lastTime) / (50 * time.Millisecond) 63 if dt < 0 { 64 t.Errorf("Got %s after %s", nextTime, lastTime) 65 } 66 lastTime = nextTime 67 } 68 }