Started the implementation of getMusicDirectory. Probably will need to introduce a new 'service' layer...

persistence/index_repository_test.go

@@ -23,6 +23,17 @@ func TestIndexRepository(t *testing.T) {
 
 			So(s, shouldBeEqual, i)
 		})
+		Convey("It should be able to check for existance of an Id", func() {
+			i := &domain.ArtistIndex{Id: "123"}
+
+			repo.Put(i)
+
+			s, _ := repo.Exists("123")
+			So(s, ShouldBeTrue)
+
+			s, _ = repo.Exists("NOT_FOUND")
+			So(s, ShouldBeFalse)
+		})
 		Convey("Method Put() should return error if Id is not set", func() {
 			i := &domain.ArtistIndex{}