Make sure to delete existing metadata on DELETE

fixes #80

spec/swift/app_spec.rb

@@ -397,14 +397,44 @@ describe "App" do
         last_response.headers["ETag"].must_equal "\"bla\""
       end
 
-      it "returns a 404 when item doesn't exist" do
-        raises_exception = ->(url, headers) { raise RestClient::ResourceNotFound.new }
-        RestClient.stub :delete, raises_exception do
-          delete "/phil/food/steak"
+      context "when item doesn't exist" do
+        before do
+          purge_redis
+
+          put_stub = OpenStruct.new(headers: {
+            etag: "bla",
+            last_modified: "Fri, 04 Mar 2016 12:20:18 GMT"
+          })
+
+          RestClient.stub :put, put_stub do
+            put "/phil/food/steak", "si"
+          end
+
+          raises_exception = ->(url, headers) { raise RestClient::ResourceNotFound.new }
+          RestClient.stub :delete, raises_exception do
+            delete "/phil/food/steak"
+          end
         end
 
-        last_response.status.must_equal 404
-        last_response.body.must_equal "Not Found"
+        it "returns a 404" do
+          last_response.status.must_equal 404
+          last_response.body.must_equal "Not Found"
+        end
+
+        it "deletes any metadata that might still exist" do
+          raises_exception = ->(url, headers) { raise RestClient::ResourceNotFound.new }
+          RestClient.stub :delete, raises_exception do
+            delete "/phil/food/steak"
+          end
+
+          metadata = redis.hgetall "rs:m:phil:food/steak"
+          metadata.must_be_empty
+
+          redis.smembers("rs:m:phil:food/:items").must_be_empty
+          redis.hgetall("rs:m:phil:food/").must_be_empty
+
+          redis.smembers("rs:m:phil:/:items").must_be_empty
+        end
       end
 
       describe "If-Match header" do