Implement tracks/{show,listen}

features/step_definitions/tracks_step.rb

@@ -0,0 +1,11 @@
+Given /^a track named "([^"]*)"$/ do |name|
+  @track = Track.create!(:name => name)
+end
+
+Then /^I should see an audio player$/ do
+  page.should have_xpath '//audio'
+end
+
+Then /^it should provide an audio stream for "([^"]*)"$/ do |name|
+  page.should have_xpath "//audio[@src='#{stream_track_path(@track)}']"
+end