Initial experimental snapshot of next-gen storage.

Change-Id: Ifb8709960dbedd1d9f5efd88cdd359ee9fa9d26d

storage/local/test_helpers.go

@@ -0,0 +1,47 @@
+package storage_ng
+
+import (
+	"testing"
+	"time"
+
+	"github.com/prometheus/prometheus/utility/test"
+)
+
+type testStorageCloser struct {
+	storage   Storage
+	directory test.Closer
+}
+
+func (t *testStorageCloser) Close() {
+	t.storage.Close()
+	t.directory.Close()
+}
+
+func NewTestStorage(t testing.TB) (Storage, test.Closer) {
+	directory := test.NewTemporaryDirectory("test_storage", t)
+	persistence, err := NewDiskPersistence(directory.Path(), 1024)
+	if err != nil {
+		t.Fatal("Error opening disk persistence: ", err)
+	}
+	o := &MemorySeriesStorageOptions{
+		Persistence:            persistence,
+		MemoryEvictionInterval: time.Minute,
+		MemoryRetentionPeriod:  time.Hour,
+	}
+	storage, err := NewMemorySeriesStorage(o)
+	if err != nil {
+		directory.Close()
+		t.Fatalf("Error creating storage: %s", err)
+	}
+
+	storageStarted := make(chan bool)
+	go storage.Serve(storageStarted)
+	<-storageStarted
+
+	closer := &testStorageCloser{
+		storage:   storage,
+		directory: directory,
+	}
+
+	return storage, closer
+}