There isn't really any way to test the elements standalone.
GST_PLUGIN_LOADING_WHITELIST="gstreamer@$(GST_PLUGINS_DIR):gst-plugins-base@$(GSTPB_PLUGINS_DIR):gst-plugins-good:gst-plugins-ugly:gst-libav:gst-plugins-bad@$(top_builddir)" \
GST_STATE_IGNORE_ELEMENTS="apexsink avdtpsrc camerabin dc1394src \
dccpclientsrc dccpclientsink dccpserversrc dccpserversink decklinksrc \
- decklinksink dvbsrc dvbbasebin dfbvideosink festival fluidsynth gsettingsvideosrc \
+ decklinksink dtlssrtpdec dtlssrtpenc dvbsrc dvbbasebin dfbvideosink festival fluidsynth gsettingsvideosrc \
gsettingsvideosink gsettingsaudiosrc gsettingsaudiosink linsyssdisrc linsyssdisink nassink \
rsndvdbin sdlaudiosink sdlvideosink vcdsrc rfbsrc vdpauyuvvideo vdpauvideoyuv \
vdpaumpegdec vdpaumpeg4dec vdpauh264dec vdpauvideopostprocess vdpausink neonhttpsrc"