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cache_provider_test.go
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cache_provider_test.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package config
import (
"sync"
"sync/atomic"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestCacheProviderName(t *testing.T) {
t.Parallel()
s, err := NewStaticProvider(nil)
require.NoError(t, err)
c, err := newCachedProvider(s)
require.NoError(t, err, "Can't create a cached provider")
assert.Equal(t, `cached "static"`, c.Name())
}
func TestCachedProvider_ConstructorErrorsOnNil(t *testing.T) {
t.Parallel()
_, err := newCachedProvider(nil)
require.Error(t, err)
assert.Contains(t, err.Error(), "received a nil provider")
}
type testCachedProvider struct {
NopProvider
f func(string) Value
}
func (t testCachedProvider) Get(key string) Value {
return t.f(key)
}
func TestCachedProvider_GetNewValues(t *testing.T) {
t.Parallel()
count := 0
m := testCachedProvider{}
m.f = func(key string) Value {
if count > 0 {
t.Fatal("cache was called more than once")
}
count++
return NewValue(m, key, "Simpsons", true)
}
p, err := newCachedProvider(m)
require.NoError(t, err, "Can't create a cached provider")
v := p.Get("cartoon")
v = v.Get(Root)
require.True(t, v.HasValue())
assert.Equal(t, "Simpsons", v.Value())
v2 := p.Get("cartoon")
assert.Equal(t, v, v2)
assert.Equal(t, p, v.provider)
}
func TestCachedProviderConcurrentUse(t *testing.T) {
t.Parallel()
m := testCachedProvider{}
var count int32
m.f = func(key string) Value {
if atomic.LoadInt32(&count) > 1 {
t.Fatal("cache was called more than twice")
}
return NewValue(m, key, "Simpsons", true)
}
p, err := newCachedProvider(m)
require.NoError(t, err, "Can't create a cached provider")
wg := sync.WaitGroup{}
wg.Add(2)
get := func() {
x := p.Get(Root)
assert.True(t, x.HasValue())
wg.Done()
}
go get()
go get()
wg.Wait()
}