/* Copyright 2021 The Kubernetes Authors. 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. */ /* Copyright 2013 Google Inc. 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 lru import ( "testing" "time" ) type simpleStruct struct { int string } type complexStruct struct { int simpleStruct } var getTests = []struct { name string keyToAdd interface{} keyToGet interface{} expectedOk bool }{ {"string_hit", "myKey", "myKey", true}, {"string_miss", "myKey", "nonsense", false}, {"simple_struct_hit", simpleStruct{1, "two"}, simpleStruct{1, "two"}, true}, {"simple_struct_miss", simpleStruct{1, "two"}, simpleStruct{0, "noway"}, false}, {"complex_struct_hit", complexStruct{1, simpleStruct{2, "three"}}, complexStruct{1, simpleStruct{2, "three"}}, true}, } func TestGet(t *testing.T) { for _, tt := range getTests { lru := New(0) lru.Add(tt.keyToAdd, 1234) val, ok := lru.Get(tt.keyToGet) if ok != tt.expectedOk { t.Fatalf("%s: cache hit = %v; want %v", tt.name, ok, !ok) } else if ok && val != 1234 { t.Fatalf("%s expected get to return 1234 but got %v", tt.name, val) } } } func TestRemove(t *testing.T) { lru := New(0) lru.Add("myKey", 1234) if val, ok := lru.Get("myKey"); !ok { t.Fatal("TestRemove returned no match") } else if val != 1234 { t.Fatalf("TestRemove failed. Expected %d, got %v", 1234, val) } lru.Remove("myKey") if _, ok := lru.Get("myKey"); ok { t.Fatal("TestRemove returned a removed entry") } } func TestGetRace(t *testing.T) { // size to force eviction and exercise next,curr,prev list behavior lru := New(25) stop := make(chan struct{}) defer close(stop) // set up parallel getters/writers on 2x len keys for key := 0; key < 50; key++ { go func(key int) { for { select { case <-stop: return default: lru.Get(key) lru.Add(key, 1) lru.Get(key) } } }(key) } // let them run time.Sleep(5 * time.Second) } func TestEviction(t *testing.T) { var seenKey Key var seenVal interface{} lru := NewWithEvictionFunc(1, func(key Key, value interface{}) { seenKey = key seenVal = value }) lru.Add(1, 2) lru.Add(3, 4) if seenKey != 1 || seenVal != 2 { t.Errorf("unexpected eviction data: key=%v val=%v", seenKey, seenVal) } }