Fix deprecation warning re: sqlite representing boolean as integer in Rails >= 5.2

(cherry picked from commit b4c0bdd)

Author: Carl Thuringer

test/test_helper.rb

@@ -60,6 +60,9 @@ class TestApp < Rails::Application
     config.active_support.halt_callback_chains_on_return_false = false
     config.active_record.time_zone_aware_types = [:time, :datetime]
     config.active_record.belongs_to_required_by_default = false
+    if Rails::VERSION::MINOR >= 2
+      config.active_record.sqlite3.represent_boolean_as_integer = true
+    end
   end
 end