Introduced engine.Scrobbler

Also refactored mocks into their original packages, to avoid cyclic references. Is there a better way to have mocks in GoLang tests?

engine/scrobbler_test.go

@@ -0,0 +1,74 @@
+package engine_test
+
+import (
+	"testing"
+	"time"
+
+	"github.com/deluan/gosonic/engine"
+	"github.com/deluan/gosonic/itunesbridge"
+	"github.com/deluan/gosonic/persistence"
+	. "github.com/deluan/gosonic/tests"
+	. "github.com/smartystreets/goconvey/convey"
+	"github.com/syndtr/goleveldb/leveldb/errors"
+)
+
+func TestScrobbler(t *testing.T) {
+
+	Init(t, false)
+
+	mfRepo := persistence.CreateMockMediaFileRepo()
+	itCtrl := &mockItunesControl{}
+
+	scrobbler := engine.NewScrobbler(itCtrl, mfRepo)
+
+	Convey("Given a DB with one song", t, func() {
+		mfRepo.SetData(`[{"Id":"2","Title":"Hands Of Time"}]`, 1)
+
+		Convey("When I scrobble an existing song", func() {
+			now := time.Now()
+			mf, err := scrobbler.Register("2", now, true)
+
+			Convey("Then I get the scrobbled song back", func() {
+				So(err, ShouldBeNil)
+				So(mf.Title, ShouldEqual, "Hands Of Time")
+			})
+
+			Convey("And iTunes is notified", func() {
+				So(itCtrl.played, ShouldContainKey, "2")
+				So(itCtrl.played["2"].Equal(now), ShouldBeTrue)
+			})
+
+		})
+
+		Convey("When the ID is not in the DB", func() {
+			_, err := scrobbler.Register("3", time.Now(), true)
+
+			Convey("Then I receive an error", func() {
+				So(err, ShouldNotBeNil)
+			})
+
+			Convey("And iTunes is not notified", func() {
+				So(itCtrl.played, ShouldNotContainKey, "3")
+			})
+		})
+
+	})
+
+}
+
+type mockItunesControl struct {
+	itunesbridge.ItunesControl
+	played map[string]time.Time
+	error  bool
+}
+
+func (m *mockItunesControl) MarkAsPlayed(id string, playDate time.Time) error {
+	if m.error {
+		return errors.New("ID not found")
+	}
+	if m.played == nil {
+		m.played = make(map[string]time.Time)
+	}
+	m.played[id] = playDate
+	return nil
+}