k8s.io/kubernetes@v1.29.3/pkg/scheduler/metrics/metric_recorder_test.go (about)

     1  /*
     2  Copyright 2019 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 metrics
    18  
    19  import (
    20  	"sync"
    21  	"sync/atomic"
    22  	"testing"
    23  )
    24  
    25  var _ MetricRecorder = &fakePodsRecorder{}
    26  
    27  type fakePodsRecorder struct {
    28  	counter int64
    29  }
    30  
    31  func (r *fakePodsRecorder) Inc() {
    32  	atomic.AddInt64(&r.counter, 1)
    33  }
    34  
    35  func (r *fakePodsRecorder) Dec() {
    36  	atomic.AddInt64(&r.counter, -1)
    37  }
    38  
    39  func (r *fakePodsRecorder) Clear() {
    40  	atomic.StoreInt64(&r.counter, 0)
    41  }
    42  
    43  func TestInc(t *testing.T) {
    44  	fakeRecorder := fakePodsRecorder{}
    45  	var wg sync.WaitGroup
    46  	loops := 100
    47  	wg.Add(loops)
    48  	for i := 0; i < loops; i++ {
    49  		go func() {
    50  			fakeRecorder.Inc()
    51  			wg.Done()
    52  		}()
    53  	}
    54  	wg.Wait()
    55  	if fakeRecorder.counter != int64(loops) {
    56  		t.Errorf("Expected %v, got %v", loops, fakeRecorder.counter)
    57  	}
    58  }
    59  
    60  func TestDec(t *testing.T) {
    61  	fakeRecorder := fakePodsRecorder{counter: 100}
    62  	var wg sync.WaitGroup
    63  	loops := 100
    64  	wg.Add(loops)
    65  	for i := 0; i < loops; i++ {
    66  		go func() {
    67  			fakeRecorder.Dec()
    68  			wg.Done()
    69  		}()
    70  	}
    71  	wg.Wait()
    72  	if fakeRecorder.counter != int64(0) {
    73  		t.Errorf("Expected %v, got %v", loops, fakeRecorder.counter)
    74  	}
    75  }
    76  
    77  func TestClear(t *testing.T) {
    78  	fakeRecorder := fakePodsRecorder{}
    79  	var wg sync.WaitGroup
    80  	incLoops, decLoops := 100, 80
    81  	wg.Add(incLoops + decLoops)
    82  	for i := 0; i < incLoops; i++ {
    83  		go func() {
    84  			fakeRecorder.Inc()
    85  			wg.Done()
    86  		}()
    87  	}
    88  	for i := 0; i < decLoops; i++ {
    89  		go func() {
    90  			fakeRecorder.Dec()
    91  			wg.Done()
    92  		}()
    93  	}
    94  	wg.Wait()
    95  	if fakeRecorder.counter != int64(incLoops-decLoops) {
    96  		t.Errorf("Expected %v, got %v", incLoops-decLoops, fakeRecorder.counter)
    97  	}
    98  	// verify Clear() works
    99  	fakeRecorder.Clear()
   100  	if fakeRecorder.counter != int64(0) {
   101  		t.Errorf("Expected %v, got %v", 0, fakeRecorder.counter)
   102  	}
   103  }