* test/test_bin.rb: use Gst::Bin#get_child instead of [].
* test/test_bin.rb: use Gst::Bin#get_child instead of [].


kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2,kitachro/ruby-gnome2