Don't scrobble releases with zero duration

test/music_brainz/release_test.exs

@@ -0,0 +1,24 @@
+defmodule MusicBrainz.ReleaseTest do
+  use ExUnit.Case, async: true
+
+  alias MusicBrainz.{Fixtures, Release}
+
+  describe "release_duration/1" do
+    test "it returns the total seconds" do
+      release =
+        Fixtures.Release.release_with_media(:marbles)
+        |> Release.from_api_response()
+
+      assert Release.release_duration(release) == 5_933_595
+    end
+
+    test "it handles empty durations" do
+      release =
+        Fixtures.Release.release_with_media(:marbles)
+        |> put_in(["media", Access.all(), "tracks", Access.all(), "length"], nil)
+        |> Release.from_api_response()
+
+      assert Release.release_duration(release) == 0
+    end
+  end
+end