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91 lines
2.4 KiB
Go
91 lines
2.4 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cache
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import (
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"testing"
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)
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const (
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maxTestCacheSize int = shardsCount * 2
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)
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func ExpectEntry(t *testing.T, cache Cache, index uint64, expectedValue interface{}) bool {
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elem, found := cache.Get(index)
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if !found {
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t.Errorf("Expected to find entry with key %d", index)
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return false
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} else if elem != expectedValue {
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t.Errorf("Expected to find %v, got %v", expectedValue, elem)
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return false
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}
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return true
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}
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func TestBasic(t *testing.T) {
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cache := NewCache(maxTestCacheSize)
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cache.Add(1, "xxx")
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ExpectEntry(t, cache, 1, "xxx")
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}
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func TestOverflow(t *testing.T) {
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cache := NewCache(maxTestCacheSize)
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for i := 0; i < maxTestCacheSize+1; i++ {
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cache.Add(uint64(i), "xxx")
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}
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foundIndexes := make([]uint64, 0)
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for i := 0; i < maxTestCacheSize+1; i++ {
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_, found := cache.Get(uint64(i))
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if found {
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foundIndexes = append(foundIndexes, uint64(i))
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}
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}
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if len(foundIndexes) != maxTestCacheSize {
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t.Errorf("Expect to find %d elements, got %d %v", maxTestCacheSize, len(foundIndexes), foundIndexes)
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}
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}
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func TestOverwrite(t *testing.T) {
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cache := NewCache(maxTestCacheSize)
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cache.Add(1, "xxx")
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ExpectEntry(t, cache, 1, "xxx")
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cache.Add(1, "yyy")
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ExpectEntry(t, cache, 1, "yyy")
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}
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// TestEvict this test will fail sporatically depending on what add()
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// selects for the randomKey to be evicted. Ensure that randomKey
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// is never the key we most recently added. Since the chance of failure
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// on each evict is 50%, if we do it 7 times, it should catch the problem
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// if it exists >99% of the time.
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func TestEvict(t *testing.T) {
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cache := NewCache(shardsCount)
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var found bool
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for retry := 0; retry < 7; retry++ {
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cache.Add(uint64(shardsCount), "xxx")
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found = ExpectEntry(t, cache, uint64(shardsCount), "xxx")
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if !found {
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break
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}
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cache.Add(0, "xxx")
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found = ExpectEntry(t, cache, 0, "xxx")
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if !found {
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break
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}
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}
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}
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