This is a fallout from commit 8cc026da8cdeb or bug 767472.

Some of the functional tests run the tracker-extract binary directly with the --file parameter, and parse the output off stdout using ExtractorParser. However, the format of the output generated by TrackerResource has changed. The default output-format is now Turtle, but switching it to output SPARQL is not enough to get ExtractorParser to process it.

Earlier, it looked like:
  SPARQL pre-update:
  --
  <preupdate string>
  --

  SPARQL item:
  --
  <statements string>
  --

  ... and so on.

Nowadays, the SPARQL output looks like:
  DELETE {
     ...
  }
  WHERE
     ...
  }
  INSERT
     ...
  }

However, I can't figure out the exact contents of the earlier output because building older versions of Tracker fails with:
tracker-bus.vala:171.2-171.63: error: overriding method `Tracker.Bus.Connection.update_array_async' is incompatible with base method `Tracker.Sparql.Connection.update_array_async': Base method expected return type `GLib.GenericArray<Tracker.Sparql.Error?>?', but `GLib.GenericArray<GLib.Error?>?' was provided.