tests: add test for updating playback rate
tests: add test for updating playback rate

Tests if a seek with both positions being GST_SEEK_TYPE_NONE is handled.

cablelabs/gstreamer,jpakkane/gstreamer,lovebug356/gstreamer,shelsonjava/gstreamer,jpakkane/gstreamer,krichter722/gstreamer,collects/gstreamer,shelsonjava/gstreamer,lubosz/gstreamer,shelsonjava/gstreamer,surround-io/gstreamer,jpakkane/gstreamer,magcius/gstreamer,justinjoy/gstreamer,Distrotech/gstreamer,lubosz/gstreamer,centricular/gstreamer,Distrotech/gstreamer,mrchapp/gstreamer,mrchapp/gstreamer,krieger-od/gstreamer,cablelabs/gstreamer,Distrotech/gstreamer,justinjoy/gstreamer,cfoch/gstreamer,surround-io/gstreamer,cfoch/gstreamer,Lachann/gstreamer,jpakkane/gstreamer,mparis/gstreamer,shelsonjava/gstreamer,collects/gstreamer,ahmedammar/platform_external_gst_gstreamer,StreamUtils/gstreamer,mparis/gstreamer,centricular/gstreamer,mparis/gstreamer,cfoch/gstreamer,ahmedammar/platform_external_gst_gstreamer,jpxiong/gstreamer,mparis/gstreamer,drothlis/gstreamer,StreamUtils/gstreamer,lubosz/gstreamer,justinjoy/gstreamer,cfoch/gstreamer,mparis/gstreamer,jpxiong/gstreamer,krieger-od/gstreamer,Lachann/gstreamer,drothlis/gstreamer,krichter722/gstreamer,mrchapp/gstreamer,justinjoy/gstreamer,ahmedammar/platform_external_gst_gstreamer,lovebug356/gstreamer,lubosz/gstreamer,collects/gstreamer,surround-io/gstreamer,ahmedammar/platform_external_gst_gstreamer,ensonic/gstreamer,drothlis/gstreamer,cablelabs/gstreamer,jpxiong/gstreamer,centricular/gstreamer,collects/gstreamer,magcius/gstreamer,ylatuya/gstreamer,ylatuya/gstreamer,drothlis/gstreamer,ensonic/gstreamer,ylatuya/gstreamer,lubosz/gstreamer,Lachann/gstreamer,ahmedammar/platform_external_gst_gstreamer,lovebug356/gstreamer,mrchapp/gstreamer,drothlis/gstreamer,ylatuya/gstreamer,ensonic/gstreamer,jpakkane/gstreamer,ensonic/gstreamer,lovebug356/gstreamer,centricular/gstreamer,magcius/gstreamer,krichter722/gstreamer,cablelabs/gstreamer,krichter722/gstreamer,StreamUtils/gstreamer,mrchapp/gstreamer,shelsonjava/gstreamer,magcius/gstreamer,ylatuya/gstreamer,cablelabs/gstreamer,centricular/gstreamer,collects/gstreamer,surround-io/gstreamer,krieger-od/gstreamer,Distrotech/gstreamer,surround-io/gstreamer,ensonic/gstreamer,krieger-od/gstreamer,jpxiong/gstreamer,krichter722/gstreamer,krieger-od/gstreamer,lovebug356/gstreamer,Lachann/gstreamer,magcius/gstreamer,justinjoy/gstreamer,cfoch/gstreamer,StreamUtils/gstreamer,Distrotech/gstreamer,StreamUtils/gstreamer,Lachann/gstreamer,jpxiong/gstreamer