store: use stopper, extraxt StringStore tests

server/store/middleware/infohash/blacklist.go

@@ -14,7 +14,7 @@ func init() {
 	tracker.RegisterAnnounceMiddleware("infohash_blacklist", blacklistAnnounceInfohash)
 	tracker.RegisterScrapeMiddlewareConstructor("infohash_blacklist", blacklistScrapeInfohash)
 	mustGetStore = func() store.StringStore {
-		return store.MustGetStore()
+		return store.MustGetStore().StringStore
 	}
 }
 

server/store/middleware/infohash/blacklist_test.go

@@ -10,6 +10,7 @@ import (
 	"github.com/stretchr/testify/assert"
 
 	"github.com/chihaya/chihaya"
+	"github.com/chihaya/chihaya/pkg/stopper"
 	"github.com/chihaya/chihaya/server/store"
 	"github.com/chihaya/chihaya/tracker"
 )
@@ -36,6 +37,10 @@ func (ss *storeMock) RemoveString(s string) error {
 	return nil
 }
 
+func (ss *storeMock) Stop() <-chan error {
+	return stopper.AlreadyStopped
+}
+
 var mock store.StringStore = &storeMock{
 	strings: make(map[string]struct{}),
 }