test: Improve test suite setup

spec/dummy/config/application.rb

@@ -1,26 +1,23 @@
 require_relative 'boot'
 
 require 'rails/all'
-require 'sprockets/railtie'
 
 Bundler.require(*Rails.groups)
 
 module Dummy
   class Application < Rails::Application
-    # Initialize configuration defaults for originally generated Rails version.
-    config.load_defaults 6.0 if Rails::VERSION::MAJOR == 6
+    config.load_defaults Rails::VERSION::STRING.to_f
 
-    # Settings in config/environments/* take precedence over those specified here.
-    # Application configuration can go into files in config/initializers
-    # -- all .rb files in that directory are automatically loaded after loading
-    # the framework and any gems in your application.
+    config.active_support.deprecation = :raise
 
-    ###
+    if Gem::Version.new(Rails.version) < Gem::Version.new('7.1')
+      config.active_record.legacy_connection_handling = false
+    end
 
-    config.active_record.legacy_connection_handling = false if Gem::Version.new(Rails.version) < Gem::Version.new('7.1')
-
-    config.before_configuration do
-      ActiveSupport::Cache.format_version = 7.0 if Gem::Version.new(Rails.version) > Gem::Version.new('7.0')
+    if Gem::Version.new(Rails.version) > Gem::Version.new('7.0')
+      config.before_configuration do
+        ActiveSupport::Cache.format_version = 7.0
+      end
     end
   end
 end