FEATURE: out-of-the-box dark/light user selectable themes

spec/models/stylesheet_cache_spec.rb

@@ -4,6 +4,8 @@ describe StylesheetCache do
 
   describe "add" do
     it "correctly cycles once MAX_TO_KEEP is hit" do
+      StylesheetCache.destroy_all
+
       (StylesheetCache::MAX_TO_KEEP + 1).times do |i|
         StylesheetCache.add("a", "d" + i.to_s, "c" + i.to_s, "map")
       end
@@ -13,6 +15,8 @@ describe StylesheetCache do
     end
 
     it "does nothing if digest is set and already exists" do
+      StylesheetCache.destroy_all
+
       StylesheetCache.add("a", "b", "c", "map")
       StylesheetCache.add("a", "b", "cc", "map")