diff --git a/app.rb b/app.rb
index d3a71f70..6cd70c01 100644
--- a/app.rb
+++ b/app.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require './environment.rb'
 require './app_helpers.rb'
 
diff --git a/app/supporter.rb b/app/supporter.rb
index 1081d23d..bc29801a 100644
--- a/app/supporter.rb
+++ b/app/supporter.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 get '/supporter/?' do
   @title = 'Become a Supporter'
   erb :'welcome'
diff --git a/tests/acceptance/admin_tests.rb b/tests/acceptance/admin_tests.rb
index d1ba96e9..2dce24fa 100644
--- a/tests/acceptance/admin_tests.rb
+++ b/tests/acceptance/admin_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 
 describe '/admin' do
diff --git a/tests/acceptance/browse_tests.rb b/tests/acceptance/browse_tests.rb
index 31ad7cdb..b6092c53 100644
--- a/tests/acceptance/browse_tests.rb
+++ b/tests/acceptance/browse_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 
 describe '/browse' do
diff --git a/tests/acceptance/dashboard_tests.rb b/tests/acceptance/dashboard_tests.rb
index b89947ce..370bf275 100644
--- a/tests/acceptance/dashboard_tests.rb
+++ b/tests/acceptance/dashboard_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 
 describe 'dashboard' do
diff --git a/tests/acceptance/education_tests.rb b/tests/acceptance/education_tests.rb
index d90e9ba6..c936a6e5 100644
--- a/tests/acceptance/education_tests.rb
+++ b/tests/acceptance/education_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 
 describe 'signup' do
diff --git a/tests/acceptance/environment.rb b/tests/acceptance/environment.rb
index 92a2408d..afe2d2bd 100644
--- a/tests/acceptance/environment.rb
+++ b/tests/acceptance/environment.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative '../environment'
 
 require 'capybara'
diff --git a/tests/acceptance/index_tests.rb b/tests/acceptance/index_tests.rb
index 872896be..c28118dd 100644
--- a/tests/acceptance/index_tests.rb
+++ b/tests/acceptance/index_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 
 describe '/' do
diff --git a/tests/acceptance/password_reset_tests.rb b/tests/acceptance/password_reset_tests.rb
index 3d9ffad0..f231e60d 100644
--- a/tests/acceptance/password_reset_tests.rb
+++ b/tests/acceptance/password_reset_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 
 describe '/password_reset' do
diff --git a/tests/acceptance/settings/account_tests.rb b/tests/acceptance/settings/account_tests.rb
index 53473660..fa27bb0e 100644
--- a/tests/acceptance/settings/account_tests.rb
+++ b/tests/acceptance/settings/account_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative '../environment.rb'
 
 describe 'site/settings' do
diff --git a/tests/acceptance/settings/site_tests.rb b/tests/acceptance/settings/site_tests.rb
index 362bd3ea..dd62a369 100644
--- a/tests/acceptance/settings/site_tests.rb
+++ b/tests/acceptance/settings/site_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative '../environment.rb'
 
 describe 'site/settings' do
diff --git a/tests/acceptance/signin_tests.rb b/tests/acceptance/signin_tests.rb
index 5e37440b..4c68fa57 100644
--- a/tests/acceptance/signin_tests.rb
+++ b/tests/acceptance/signin_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 
 describe 'signin' do
diff --git a/tests/acceptance/signup_tests.rb b/tests/acceptance/signup_tests.rb
index 35008123..443b10d7 100644
--- a/tests/acceptance/signup_tests.rb
+++ b/tests/acceptance/signup_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 
 describe 'signup' do
diff --git a/tests/acceptance/site_tests.rb b/tests/acceptance/site_tests.rb
index a7cac4e7..f411547d 100644
--- a/tests/acceptance/site_tests.rb
+++ b/tests/acceptance/site_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 
 describe 'site page' do
diff --git a/tests/acceptance/supporter_tests.rb b/tests/acceptance/supporter_tests.rb
index d53297d0..6f64db84 100644
--- a/tests/acceptance/supporter_tests.rb
+++ b/tests/acceptance/supporter_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 
 describe '/supporter' do
diff --git a/tests/api_tests.rb b/tests/api_tests.rb
index 45ad37b5..8ac39c59 100644
--- a/tests/api_tests.rb
+++ b/tests/api_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 require 'rack/test'
 
diff --git a/tests/environment.rb b/tests/environment.rb
index 1fb0aa0a..d4a238d3 100644
--- a/tests/environment.rb
+++ b/tests/environment.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 ENV['RACK_ENV'] = 'test'
 raise 'Forget it.' if ENV['RACK_ENV'] == 'production'
 
diff --git a/tests/ext_tests.rb b/tests/ext_tests.rb
index 3c2da8e5..97661a81 100644
--- a/tests/ext_tests.rb
+++ b/tests/ext_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 
 describe Time do
diff --git a/tests/fabricators/site_fabricator.rb b/tests/fabricators/site_fabricator.rb
index 45e613c9..21b41266 100644
--- a/tests/fabricators/site_fabricator.rb
+++ b/tests/fabricators/site_fabricator.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Fabricator(:site) do
   username        { SecureRandom.hex }
   password        { 'abcde' }
diff --git a/tests/site_file_tests.rb b/tests/site_file_tests.rb
index 958e691e..caf0dba6 100644
--- a/tests/site_file_tests.rb
+++ b/tests/site_file_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 require 'rack/test'
 
@@ -71,7 +72,7 @@ describe 'site_files' do
     it 'renames nonstandard file type for supporters' do
       no_file_restriction_plans = Site::PLAN_FEATURES.select {|p,v| v[:no_file_restrictions] == true}
       no_file_restriction_plans.each do |plan_type,hash|
-        @site = Fabricate :site, plan_type: plan_type
+        @site = Fabricate :site, plan_type: plan_type.to_s
         upload 'flowercrime.wav' => Rack::Test::UploadedFile.new('./tests/files/flowercrime.wav', 'audio/x-wav')
         testfile = @site.site_files_dataset.where(path: 'flowercrime.wav').first
         res = testfile.rename('flowercrime.exe')
@@ -436,7 +437,7 @@ describe 'site_files' do
     it 'succeeds for unwhitelisted file on supporter plans' do
       no_file_restriction_plans = Site::PLAN_FEATURES.select {|p,v| v[:no_file_restrictions] == true}
       no_file_restriction_plans.each do |plan_type,hash|
-        @site = Fabricate :site, plan_type: plan_type
+        @site = Fabricate :site, plan_type: plan_type.to_s
         upload 'flowercrime.wav' => Rack::Test::UploadedFile.new('./tests/files/flowercrime.wav', 'audio/x-wav')
         _(last_response.body).must_match /successfully uploaded/i
         _(File.exists?(@site.files_path('flowercrime.wav'))).must_equal true
diff --git a/tests/site_tests.rb b/tests/site_tests.rb
index 0e1a003a..6a2274cc 100644
--- a/tests/site_tests.rb
+++ b/tests/site_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 
 def app
diff --git a/tests/stat_tests.rb b/tests/stat_tests.rb
index f23b99c3..2be976d8 100644
--- a/tests/stat_tests.rb
+++ b/tests/stat_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 
 STAT_LOGS_PATH = 'tests/stat_logs'
diff --git a/tests/tag_tests.rb b/tests/tag_tests.rb
index f23761e7..6ddd6159 100644
--- a/tests/tag_tests.rb
+++ b/tests/tag_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 
 describe Tag do
diff --git a/tests/tempfile_tests.rb b/tests/tempfile_tests.rb
index 86c418a7..84fe42f5 100644
--- a/tests/tempfile_tests.rb
+++ b/tests/tempfile_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 
 describe Tempfile do
diff --git a/tests/webhook_tests.rb b/tests/webhook_tests.rb
index 5aa837be..d1912178 100644
--- a/tests/webhook_tests.rb
+++ b/tests/webhook_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative './environment.rb'
 require 'rack/test'
 
diff --git a/tests/workers/email_worker_tests.rb b/tests/workers/email_worker_tests.rb
index b2da85ce..690453eb 100644
--- a/tests/workers/email_worker_tests.rb
+++ b/tests/workers/email_worker_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative '../environment.rb'
 
 describe EmailWorker do
diff --git a/tests/workers/purge_cache_worker_tests.rb b/tests/workers/purge_cache_worker_tests.rb
index 3bf6e55e..e0e2080d 100644
--- a/tests/workers/purge_cache_worker_tests.rb
+++ b/tests/workers/purge_cache_worker_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative '../environment.rb'
 
 describe PurgeCacheWorker do
diff --git a/tests/workers/screenshot_worker_tests.rb b/tests/workers/screenshot_worker_tests.rb
index 6e5bbdb9..3f8ad7cc 100644
--- a/tests/workers/screenshot_worker_tests.rb
+++ b/tests/workers/screenshot_worker_tests.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative '../environment.rb'
 
 describe ScreenshotWorker do
diff --git a/workers/email_worker.rb b/workers/email_worker.rb
index 078f4861..88e17e93 100644
--- a/workers/email_worker.rb
+++ b/workers/email_worker.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class EmailWorker
   include Sidekiq::Worker
   sidekiq_options queue: :emails, retry: 10, backtrace: true
diff --git a/workers/screenshot_worker.rb b/workers/screenshot_worker.rb
index 23c64e1d..75c9b395 100644
--- a/workers/screenshot_worker.rb
+++ b/workers/screenshot_worker.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'sidekiq/api'
 require 'securerandom'
 require 'open3'