youtubebeat/vendor/github.com/elastic/beats/libbeat/common/cache_test.go

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2018-11-18 11:08:38 +01:00
// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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.
// +build !integration
package common
import (
"testing"
"time"
"github.com/stretchr/testify/assert"
)
const (
Timeout time.Duration = 1 * time.Minute
InitalSize int = 10
)
const (
alphaKey = "alphaKey"
alphaValue = "a"
bravoKey = "bravoKey"
bravoValue = "b"
)
// Current time as simulated by the fakeClock function.
var (
currentTime time.Time
fakeClock clock = func() time.Time {
return currentTime
}
)
// RemovalListener callback.
var (
callbackKey Key
callbackValue Value
removalListener RemovalListener = func(k Key, v Value) {
callbackKey = k
callbackValue = v
}
)
// Test that the removal listener is invoked with the expired key/value.
func TestExpireWithRemovalListener(t *testing.T) {
callbackKey = nil
callbackValue = nil
c := newCache(Timeout, InitalSize, removalListener, fakeClock)
c.Put(alphaKey, alphaValue)
currentTime = currentTime.Add(Timeout).Add(time.Nanosecond)
assert.Equal(t, 1, c.CleanUp())
assert.Equal(t, alphaKey, callbackKey)
assert.Equal(t, alphaValue, callbackValue)
}
// Test that the number of removed elements is returned by Expire.
func TestExpireWithoutRemovalListener(t *testing.T) {
c := newCache(Timeout, InitalSize, nil, fakeClock)
c.Put(alphaKey, alphaValue)
c.Put(bravoKey, bravoValue)
currentTime = currentTime.Add(Timeout).Add(time.Nanosecond)
assert.Equal(t, 2, c.CleanUp())
}
func TestPutIfAbsent(t *testing.T) {
c := newCache(Timeout, InitalSize, nil, fakeClock)
oldValue := c.PutIfAbsent(alphaKey, alphaValue)
assert.Nil(t, oldValue)
oldValue = c.PutIfAbsent(alphaKey, bravoValue)
assert.Equal(t, alphaValue, oldValue)
}
func TestPut(t *testing.T) {
c := newCache(Timeout, InitalSize, nil, fakeClock)
oldValue := c.Put(alphaKey, alphaValue)
assert.Nil(t, oldValue)
oldValue = c.Put(bravoKey, bravoValue)
assert.Nil(t, oldValue)
oldValue = c.Put(alphaKey, bravoValue)
assert.Equal(t, alphaValue, oldValue)
oldValue = c.Put(bravoKey, alphaValue)
assert.Equal(t, bravoValue, oldValue)
}
func TestReplace(t *testing.T) {
c := newCache(Timeout, InitalSize, nil, fakeClock)
// Nil is returned when the value does not exist and no element is added.
assert.Nil(t, c.Replace(alphaKey, alphaValue))
assert.Equal(t, 0, c.Size())
// alphaKey is replaced with the new value.
assert.Nil(t, c.Put(alphaKey, alphaValue))
assert.Equal(t, alphaValue, c.Replace(alphaKey, bravoValue))
assert.Equal(t, 1, c.Size())
}
func TestGetUpdatesLastAccessTime(t *testing.T) {
c := newCache(Timeout, InitalSize, nil, fakeClock)
c.Put(alphaKey, alphaValue)
currentTime = currentTime.Add(Timeout / 2)
assert.Equal(t, alphaValue, c.Get(alphaKey))
currentTime = currentTime.Add(Timeout / 2)
assert.Equal(t, alphaValue, c.Get(alphaKey))
}
func TestDeleteNonExistentKey(t *testing.T) {
c := newCache(Timeout, InitalSize, nil, fakeClock)
assert.Nil(t, c.Delete(alphaKey))
}
func TestDeleteExistingKey(t *testing.T) {
c := newCache(Timeout, InitalSize, nil, fakeClock)
c.Put(alphaKey, alphaValue)
assert.Equal(t, alphaValue, c.Delete(alphaKey))
}
func TestDeleteExpiredKey(t *testing.T) {
c := newCache(Timeout, InitalSize, nil, fakeClock)
c.Put(alphaKey, alphaValue)
currentTime = currentTime.Add(Timeout).Add(time.Nanosecond)
assert.Nil(t, c.Delete(alphaKey))
}
// Test that Entries returns the non-expired map entries.
func TestEntries(t *testing.T) {
c := newCache(Timeout, InitalSize, nil, fakeClock)
c.Put(alphaKey, alphaValue)
currentTime = currentTime.Add(Timeout).Add(time.Nanosecond)
c.Put(bravoKey, bravoValue)
m := c.Entries()
assert.Equal(t, 1, len(m))
assert.Equal(t, bravoValue, m[bravoKey])
}
// Test that Size returns a count of both expired and non-expired elements.
func TestSize(t *testing.T) {
c := newCache(Timeout, InitalSize, nil, fakeClock)
c.Put(alphaKey, alphaValue)
currentTime = currentTime.Add(Timeout).Add(time.Nanosecond)
c.Put(bravoKey, bravoValue)
assert.Equal(t, 2, c.Size())
}
func TestGetExpiredValue(t *testing.T) {
c := newCache(Timeout, InitalSize, nil, fakeClock)
c.Put(alphaKey, alphaValue)
v := c.Get(alphaKey)
assert.Equal(t, alphaValue, v)
currentTime = currentTime.Add(Timeout).Add(time.Nanosecond)
v = c.Get(alphaKey)
assert.Nil(t, v)
}
// Test that the janitor invokes CleanUp on the cache and that the
// RemovalListener is invoked during clean up.
func TestJanitor(t *testing.T) {
keyChan := make(chan Key)
c := newCache(Timeout, InitalSize, func(k Key, v Value) {
keyChan <- k
}, fakeClock)
c.Put(alphaKey, alphaValue)
currentTime = currentTime.Add(Timeout).Add(time.Nanosecond)
c.StartJanitor(time.Millisecond)
key := <-keyChan
c.StopJanitor()
assert.Equal(t, alphaKey, key)
}