Fixed a lot of linter warnings

src/routes/test.rb

@@ -1,4 +1,8 @@
+# frozen_string_literal: true
+
+# /test routes
 class GameData < Sinatra::Base
+
   get '/test' do
     tests = Test.reverse(:updated_at).limit(10).all()
 
@@ -30,19 +34,16 @@ class GameData < Sinatra::Base
     date_tag = params[:test_date_tag]
 
     # make sure the date tag field is formatting properly
-    unless date_tag.start_with?('(')
-      date_tag = '(' + date_tag
-    end
-    unless date_tag.end_with?(')')
-      date_tag = date_tag + ')'
-    end
+    date_tag = "(#{date_tag}" unless date_tag.start_with?('(')
+    date_tag += ')' unless date_tag.end_with?(')')
 
     test = Test.create(
-      date_tag: params[:test_date_tag],
+      date_tag: date_tag,
       hardware_id: params[:test_hardware],
       benchmark_id: params[:test_benchmark]
     )
 
     redirect "/test/#{test.id}"
   end
+
 end