knative.dev/pkg@v0.0.0-20260602142205-ac97e43f6622/hash/bucketer_test.go (about)

     1  /*
     2  Copyright 2020 The Knative 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      https://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 hash
    18  
    19  import (
    20  	"reflect"
    21  	"testing"
    22  
    23  	"github.com/google/go-cmp/cmp"
    24  	"k8s.io/apimachinery/pkg/types"
    25  	"k8s.io/apimachinery/pkg/util/sets"
    26  )
    27  
    28  const (
    29  	thisBucket  = "monsoon"
    30  	knownKey    = "hagel"
    31  	otherBucket = "chubasco"
    32  	unknownKey  = "snow" // snow maps to "chubasco", originally.
    33  )
    34  
    35  var buckets = sets.New[string](thisBucket, otherBucket, "aguacero", "chaparrón")
    36  
    37  func TestBucketSetOwner(t *testing.T) {
    38  	b := NewBucketSet(buckets)
    39  	if got := b.Owner(knownKey); got != thisBucket {
    40  		t.Errorf("Owner = %q, want: %q", got, thisBucket)
    41  	}
    42  	if l := b.cache.Len(); l != 1 {
    43  		t.Errorf("|Cache| = %d, want: 1", l)
    44  	}
    45  	if n, ok := b.cache.Get(knownKey); !ok || n.(string) != thisBucket {
    46  		t.Errorf("Cache[%s] = %q, want: %q", knownKey, n, thisBucket)
    47  	}
    48  	// Verify nothing is added to the cache.
    49  	if got := b.Owner(knownKey); got != thisBucket {
    50  		t.Errorf("Owner = %q, want: %q", got, thisBucket)
    51  	}
    52  	if l := b.cache.Len(); l != 1 {
    53  		t.Errorf("|Cache| = %d, want: 1", l)
    54  	}
    55  
    56  	if got := b.Owner(unknownKey); got != otherBucket {
    57  		t.Errorf("Owner = %q, want: %q", got, otherBucket)
    58  	}
    59  	if l := b.cache.Len(); l != 2 {
    60  		t.Errorf("|Cache| = %d, want: 2", l)
    61  	}
    62  	if n, ok := b.cache.Get(unknownKey); !ok || n.(string) != otherBucket {
    63  		t.Errorf("Cache[%s] = %q, want: %q", unknownKey, n, otherBucket)
    64  	}
    65  }
    66  
    67  func TestBucketSetList(t *testing.T) {
    68  	bs := NewBucketSet(buckets)
    69  
    70  	got := bs.BucketList()
    71  	if want := sets.List(buckets); !reflect.DeepEqual(got, want) {
    72  		t.Errorf("Name = %q, want: %q, diff(-want,+got):\n%s", got, want, cmp.Diff(want, got))
    73  	}
    74  }
    75  
    76  func TestBucketSetUpdate(t *testing.T) {
    77  	b := NewBucketSet(buckets)
    78  	b.Owner(knownKey)
    79  
    80  	// Need a clone.
    81  	newNames := buckets.Difference(sets.New[string](otherBucket))
    82  	b.Update(newNames)
    83  	if b.cache.Len() != 0 {
    84  		t.Error("cache was not emptied")
    85  	}
    86  
    87  	// Verify the mapping is stable.
    88  	if got := b.Owner(knownKey); got != thisBucket {
    89  		t.Errorf("Owner = %q, want: %q", got, thisBucket)
    90  	}
    91  	if l := b.cache.Len(); l != 1 {
    92  		t.Errorf("|Cache| = %d, want: 1", l)
    93  	}
    94  	if n, ok := b.cache.Get(knownKey); !ok || n.(string) != thisBucket {
    95  		t.Errorf("Cache[%s] = %q, want: %q", knownKey, n, thisBucket)
    96  	}
    97  	// unknownKey should've migrated.
    98  	if got := b.Owner(unknownKey); got == otherBucket {
    99  		t.Errorf("Owner = %q, don't want: %q", got, otherBucket)
   100  	}
   101  }
   102  
   103  func TestBucketSetBuckets(t *testing.T) {
   104  	bs := NewBucketSet(buckets)
   105  	bkts := bs.Buckets()
   106  
   107  	// Sorted
   108  	want := []string{"aguacero", "chaparrón", "chubasco", "monsoon"}
   109  	got := make([]string, len(bkts))
   110  	for i, b := range bkts {
   111  		got[i] = b.Name()
   112  	}
   113  
   114  	if !reflect.DeepEqual(got, want) {
   115  		t.Errorf("Got %q, want %q, diff(-want,+got):\n%s", got, want, cmp.Diff(want, got))
   116  	}
   117  }
   118  
   119  func TestBucketSetHasBucket(t *testing.T) {
   120  	bs := NewBucketSet(sets.New[string](thisBucket, "aguacero", "chaparrón"))
   121  	if !bs.HasBucket(thisBucket) {
   122  		t.Errorf("HasBucket(%v) = false", thisBucket)
   123  	}
   124  	if bs.HasBucket(otherBucket) {
   125  		t.Errorf("HasBucket(%v) = true", otherBucket)
   126  	}
   127  }
   128  
   129  func TestBucketHas(t *testing.T) {
   130  	bs := NewBucketSet(buckets)
   131  	b := Bucket{
   132  		name:    thisBucket,
   133  		buckets: bs,
   134  	}
   135  	thisNN := types.NamespacedName{Namespace: "snow", Name: "hail"}
   136  	if !b.Has(thisNN) {
   137  		t.Errorf("Has(%v) = false", thisNN)
   138  	}
   139  	b = Bucket{
   140  		name:    otherBucket,
   141  		buckets: bs,
   142  	}
   143  	if b.Has(thisNN) {
   144  		t.Errorf("Other bucket Has(%v) = true", thisNN)
   145  	}
   146  }
   147  
   148  func TestBucketName(t *testing.T) {
   149  	bs := NewBucketSet(buckets)
   150  	b := Bucket{
   151  		name:    thisBucket,
   152  		buckets: bs,
   153  	}
   154  	if got, want := b.Name(), thisBucket; got != want {
   155  		t.Errorf("Name = %q, want: %q", got, want)
   156  	}
   157  }