diff options
Diffstat (limited to 'vendor/github.com/golang/groupcache/singleflight/singleflight_test.go')
-rw-r--r-- | vendor/github.com/golang/groupcache/singleflight/singleflight_test.go | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/vendor/github.com/golang/groupcache/singleflight/singleflight_test.go b/vendor/github.com/golang/groupcache/singleflight/singleflight_test.go new file mode 100644 index 000000000..47b4d3dc0 --- /dev/null +++ b/vendor/github.com/golang/groupcache/singleflight/singleflight_test.go @@ -0,0 +1,85 @@ +/* +Copyright 2012 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 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", err) + } + if v != nil { + t.Errorf("unexpected non-nil value %#v", v) + } +} + +func TestDoDupSuppress(t *testing.T) { + var g Group + c := make(chan string) + var calls int32 + fn := func() (interface{}, error) { + atomic.AddInt32(&calls, 1) + return <-c, nil + } + + const n = 10 + var wg sync.WaitGroup + for i := 0; i < n; i++ { + wg.Add(1) + go func() { + v, err := g.Do("key", fn) + if err != nil { + t.Errorf("Do error: %v", err) + } + if v.(string) != "bar" { + t.Errorf("got %q; want %q", v, "bar") + } + wg.Done() + }() + } + time.Sleep(100 * time.Millisecond) // let goroutines above block + c <- "bar" + wg.Wait() + if got := atomic.LoadInt32(&calls); got != 1 { + t.Errorf("number of calls = %d; want 1", got) + } +} |