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Name	Size	Permission	Action
singleflight.go	3.24 KB	-rw-r--r--
singleflight_test.go	1.83 KB	-rw-r--r--

Code Editor : singleflight_test.go

// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package singleflight

import (
	"errors"
	"fmt"
	"sync"
	"sync/atomic"
	"testing"
	"time"
)

func TestDo(t *testing.T) {
	var g Group
	v, err, _ := g.Do("key", func() (interface{}, error) {
		return "bar", nil
	})
	if got, want := fmt.Sprintf("%v (%T)", v, v), "bar (string)"; got != want {
		t.Errorf("Do = %v; want %v", got, want)
	}
	if err != nil {
		t.Errorf("Do error = %v", err)
	}
}

func TestDoErr(t *testing.T) {
	var g Group
	someErr := errors.New("some error")
	v, err, _ := g.Do("key", func() (interface{}, error) {
		return nil, someErr
	})
	if err != someErr {
		t.Errorf("Do error = %v; want someErr %v", err, someErr)
	}
	if v != nil {
		t.Errorf("unexpected non-nil value %#v", v)
	}
}

func TestDoDupSuppress(t *testing.T) {
	var g Group
	var wg1, wg2 sync.WaitGroup
	c := make(chan string, 1)
	var calls int32
	fn := func() (interface{}, error) {
		if atomic.AddInt32(&calls, 1) == 1 {
			// First invocation.
			wg1.Done()
		}
		v := <-c
		c <- v // pump; make available for any future calls

time.Sleep(10 * time.Millisecond) // let more goroutines enter Do

return v, nil
	}

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Code Editor : singleflight_test.go