tests: add unit test to test media-info-updated signal.
tests: add unit test to test media-info-updated signal.

amorenoc/gst-player,sdroege/gst-player,codomania/gst-player,JimmyOhn/gst-player,amorenoc/gst-player,guiseco/gst-player,justinjoy/gst-player,JimmyOhn/gst-player,amorenoc/gst-player,shakin/gst-player,shakin/gst-player,sdroege/gst-player,justinjoy/gst-player,amorenoc/gst-player,codomania/gst-player,JimmyOhn/gst-player,sdroege/gst-player,sdroege/gst-player,amorenoc/gst-player,jabiers/gst-player,justinjoy/gst-player,sdroege/gst-player,codomania/gst-player,shakin/gst-player,guiseco/gst-player,JimmyOhn/gst-player,codomania/gst-player,guiseco/gst-player,jabiers/gst-player,JimmyOhn/gst-player,jabiers/gst-player,codomania/gst-player